Cristina Iojoiu - Academia.edu (original) (raw)

Papers by Cristina Iojoiu

Journal of Power Sources, Oct 1, 2017

Impact of extended anion charge delocalization on conductivities and anodic stability. Close cond... more Impact of extended anion charge delocalization on conductivities and anodic stability. Close conductivities between new fluorine-less electrolytes and PEO/LiTFSI. First it was shown a Linear Free Energy Relationships and anodic stabilities. The easy syntheses of salts pave the way for a possible scale up.

Electrochimica Acta, Jun 1, 2006

ABSTRACT An inventory of physicochemical methods was drawn up, including both analytical and macr... more ABSTRACT An inventory of physicochemical methods was drawn up, including both analytical and macromolecular techniques. Various chemical and spectroscopic analyses provide accurate determination of the cationic exchange capacity (CEC) and enable appropriate methods to be selected in order to obtain rapid and precise information about ionomers. Macromolecular characterizations, i.e. macromolecular weight distribution and ramifications are essential. In the context of our study, they allowed the degradations of polymer skeleton occurring during sulfonation to be observed both at the laboratory and pilot scales. This set of characterizations should enable optimization of both the performance and the lifespan of membranes designed for proton exchange membrane fuel cells (PEMFC) and direct methanol fuel cells (DMFC) energy sources.

HAL (Le Centre pour la Communication Scientifique Directe), May 30, 2021

International audienc

Polymer Science Series B, Dec 1, 2009

New poly(arylene ethers) containing side sulfo groups have been synthesized through the copoly co... more New poly(arylene ethers) containing side sulfo groups have been synthesized through the copoly condensation of 3,5 dinitrodiphenyl sulfone 4' sulfonic acid and 4,4' dichlorodiphenyl sulfone with bicyclic aromatic bisphenols under the conditions of aromatic nucleophilic substitution. On the basis of the blends of these copolymers with sulfonated poly(arylene ester ether ketone), membranes with satisfactory mechanical characteristics and high proton conductivity have been prepared.

Journal of Industrial and Engineering Chemistry, Jun 1, 2023

Meeting abstracts, 2017

In PEM Fuel Cells, Ionic liquids i.e. Proton-conducting Ionic Liquids, PILs, behave as proton-con... more In PEM Fuel Cells, Ionic liquids i.e. Proton-conducting Ionic Liquids, PILs, behave as proton-conducting materials to increase PEMFC operating temperature. Based on primary, secondary or tertiary ammoniums, they are ‘self-sufficient’ i.e. they don´t require any additional acids to perform the electrochemical reactions. Thus macroporous membranes have been successfully filled by PILs. Alternatively, PILs can be too associated to proton-conducting ionomers e.g. Nafion® or high performance based ionomers beforehand turned into their ammonium form in order to avoid molecular acid release. In the first case, high mechanical strength can be obtained while the swelling of PFSA ionomers by PILs increase markedly the proton-conductivity at the anhydrous state but strongly decrease the membrane mechanical strength. While PILs are self-sufficient in electrochemical conversion (FC), usual Li-ion battery ILs based on quaternary ammonium require conversely adding a lithium salt. The well-known advantages of ILs vs liquid solvents e.g. high Fp and high sub-ambient conductivities are partly compensated by the compulsory addition of the salt, which increases the viscosity and also the electrolyte cost. Oligoethers i.e. oligo(oxyethylene) or oligo-PEO) end-capped by 1, 2 or 3 salt moieties doesn’t match the performances of classical ionic liquids, in terms of sub-ambient conductivities but they both provide the lithium salt function and a solvating ability. This presentation will focus on new lithium-conducting oligomeric ionic liquids consisting of several oligoether chain lengths end-capped by organic perfluorinated anions. Their intrinsic ionic conductivities and those of related POE blends will be reported as well as their cationic transference numbers. Both classical ILs and oligomeric lithium-conducting ionic liquids degrading the electrolyte mechanical performances, they don´t allow thinning the polymer electrolyte films. A special attention will be paid to the reinforcement of ILs based polymer electrolytes.

ACS applied energy materials, Jun 2, 2022

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Electrochimica Acta, Dec 1, 2011

Lithium pentafluorobenzene sulfonate was synthesized by a protocol whereby pollution by aromatic ... more Lithium pentafluorobenzene sulfonate was synthesized by a protocol whereby pollution by aromatic nucleophilic substitutions on the perfluorinated ring was avoided. Its poly(oxyethylene) complexes, although less conductive than lithium imide complexes, provided cationic transference numbers higher than 0.5. Surprisingly, even at fairly low concentrations, this salt markedly increased the mechanical properties of the polymer electrolyte. This effect was attributed to telechelic interactions of the ion pairs with distinct polyether chains and is in agreement with the high cationic transference numbers.

Journal of Solid State Electrochemistry, Jan 18, 2021

Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lit... more Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lithium-metal batteries employing high capacity, transition metal oxide-positive electrodes. Herein, we report the investigation of lithium-metal battery cells comprising Li[Ni 0.6 Mn 0.2 Co 0.2 ]O 2 as active material for the positive electrode and a poly(arylene ether sulfone)-based singleion conductor as the electrolyte incorporating ethylene carbonate (EC) as selectively coordinating molecular transporter. The resulting lithium-metal battery cells provide very stable cycling for more than 300 cycles accompanied by excellent average Coulombic efficiency (99.95%) at an anodic cutoff potential of 4.2 V. To further increase the achievable energy density, the stepwise increase to 4.3 V and 4.4 V is herein investigated, highlighting that the polymer electrolyte offers comparable cycling stability, at least, as common liquid organic electrolytes. Moreover, the impact of temperature and the EC content on the rate capability is evaluated, showing that the cells with a higher EC content offer a capacity retention at 2C rate equal to 61% of the capacity recorded at 0.05 C at 60°C.

Membranes, May 18, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

High Performance Polymers, Dec 11, 2007

Magnetite nanoparticles (MNPs) were prepared by co-precipitation method and were found to have av... more Magnetite nanoparticles (MNPs) were prepared by co-precipitation method and were found to have average size of 5 nm with spherical shape crystalline structure with super-magnetic properties. Commercial polystyrene (PS) was sulfonated through the reaction with freshly prepared acetyl sulfate. Three different degrees of sulfonation, based on the ratio of the acetyl sulfate to polystyrene, were prepared (1:1, 1:3 and 1:5). Nanocomposites of the prepared magnetite nanoparticles 1:3 sulfonated polystyrene were prepared at different magnetite content (1, 5 and 10%). The produced materials were characterized by dynamic light scattering (DLS), transmittance electron microscope (TEM) X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). PS, MNPs and the prepared nanocomposites were investigated as adsorbents for Congo Red (CR). The variables influencing the adsorption capacity, such as solution pH, contact time and the initial dye concentration were systematically investigated. The adsorption for CR by the previous adsorbents show maximum experimental uptake capacity of 26.78, 33.15, 53.35, 64.73, and 76.29 mg/g for PS, MNPs, SPS/MNPs 1%, SPS/MNPs 5% and SPS/MNPs 10%, respectively. The adsorption process was found to follow the pseudo second order kinetic model and fit quite well with Langmuir adsorption isotherm.

HAL (Le Centre pour la Communication Scientifique Directe), Sep 20, 2021

Membranes

Composite anion-exchange membranes (AEMs) consisting of a porous substrate and a vinyl imidazoliu... more Composite anion-exchange membranes (AEMs) consisting of a porous substrate and a vinyl imidazolium poly(phenylene oxide) (VIMPPO)/acrylamide copolymer layer were fabricated in a straightforward process, for use in redox flow batteries. The porous substrate was coated with a mixture of VIMPPO and acrylamide monomers, then subsequently exposed to UV irradiation, in order to obtain a radically cured ion-exchange coating. Combining VIMPPO with low-value reagents allowed to significantly reduce the amount of synthesized ionomer used to fabricate the mem- brane down to 15%. Varying the VIMPPO content also allowed tuning the ionic transport properties of the resulting AEM. A series of membranes with different VIMPPO/acrylamides ratios were prepared to assess the optimal composition by studying the changes of membranes properties—water uptake, area resistivity, permeability, and chemical stability. Characterization of the membranes was followed by cycling experiments in a vanadium RFB (VRFB...

Physical Chemistry Chemical Physics

The solvation structure and ionic conductivity of Ca(TFSI)2/tetraglyme solutions were studied usi... more The solvation structure and ionic conductivity of Ca(TFSI)2/tetraglyme solutions were studied using a combination of experimental and theoretical approaches. A higher fraction of free ions was detected in solutions with higher molar concentrations.

Molecules, 2021

The membrane is a crucial component of Zn slurry–air flow battery since it provides ionic conduct... more The membrane is a crucial component of Zn slurry–air flow battery since it provides ionic conductivity between the electrodes while avoiding the mixing of the two compartments. Herein, six commercial membranes (Cellophane™ 350PØØ, Zirfon®, Fumatech® PBI, Celgard® 3501, 3401 and 5550) were first characterized in terms of electrolyte uptake, ion conductivity and zincate ion crossover, and tested in Zn slurry–air flow battery. The peak power density of the battery employing the membranes was found to depend on the in-situ cell resistance. Among them, the cell using Celgard® 3501 membrane, with in-situ area resistance of 2 Ω cm2 at room temperature displayed the highest peak power density (90 mW cm−2). However, due to the porous nature of most of these membranes, a significant crossover of zincate ions was observed. To address this issue, an ion-selective ionomer containing modified poly(phenylene oxide) (PPO) and N-spirocyclic quaternary ammonium monomer was coated on a Celgard® 3501 m...

Membranes, 2021

Flexible cross-linked anion exchange membranes (AEMs) based on poly (p-phenylene oxide) grafted w... more Flexible cross-linked anion exchange membranes (AEMs) based on poly (p-phenylene oxide) grafted with N-spirocyclic quaternary ammonium cations were synthesized via UV-induced free-radical polymerization by using diallylpiperidinium chloride as an ionic monomer. Five membranes with ion exchange capacity (IEC) varying between 1.5 to 2.8 mmol Cl−·g−1 polymer were obtained and the correlation between IEC, water uptake, state of water in the membrane and ionic conductivity was studied. In the second part of this study, the influence of properties of four of these membranes on cell cycling stability and performance was investigated in an aqueous organic redox flow battery (AORFB) employing dimethyl viologen (MV) and N,N,N-2,2,6,6-heptamethylpiperidinyl oxy-4-ammonium chloride (TMA-TEMPO). The influence of membrane properties on cell cycling stability and performance was studied. At low-current density (20 mA·cm−2), the best capacity retention was obtained with lower IEC membranes for whic...

L'invention concerne un procede de preparation de suif onylimidures aromatiques, les suif ony... more L'invention concerne un procede de preparation de suif onylimidures aromatiques, les suif onylimidures obtenus, et leur utilisation comme sel d'un electrolyte. Les suif onylimidure repondent a la formule formule [R-SO2-N-SO2R']rM (I). R' est un groupe ArZL-. R' est un groupe perfluoroalkyle ou un groupe ArZL-. Z est un groupe S, SO, ou SO2. L est un groupe - (CF2) n-CFRf-. n est 0 ou 1; Rf represente F ou groupe perfluoroalkyle en C1 a C8; Ar est un groupement aromatique. M represente H, un cation de metal alcalin, de metal alcalino-terreux, de metal trivalent ou tetravalent, ou un cation organique. Le procede consiste a preparer un compose RSO2N (R') SO2R' a partir de RSO2F, et a remplacer le groupe R' par une reaction de substitution nucleophile pour obtenir le compose (I), R' etant un groupe benzyle ou trimethylsilyle.

Journal of Solid State Electrochemistry, 2021

Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lit... more Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lithium-metal batteries employing high capacity, transition metal oxide–positive electrodes. Herein, we report the investigation of lithium-metal battery cells comprising Li[Ni0.6Mn0.2Co0.2]O2 as active material for the positive electrode and a poly(arylene ether sulfone)-based single-ion conductor as the electrolyte incorporating ethylene carbonate (EC) as selectively coordinating molecular transporter. The resulting lithium-metal battery cells provide very stable cycling for more than 300 cycles accompanied by excellent average Coulombic efficiency (99.95%) at an anodic cutoff potential of 4.2 V. To further increase the achievable energy density, the stepwise increase to 4.3 V and 4.4 V is herein investigated, highlighting that the polymer electrolyte offers comparable cycling stability, at least, as common liquid organic electrolytes. Moreover, the impact of temperature and the EC conten...

Journal of Power Sources, Oct 1, 2017

Impact of extended anion charge delocalization on conductivities and anodic stability. Close cond... more Impact of extended anion charge delocalization on conductivities and anodic stability. Close conductivities between new fluorine-less electrolytes and PEO/LiTFSI. First it was shown a Linear Free Energy Relationships and anodic stabilities. The easy syntheses of salts pave the way for a possible scale up.

Electrochimica Acta, Jun 1, 2006

ABSTRACT An inventory of physicochemical methods was drawn up, including both analytical and macr... more ABSTRACT An inventory of physicochemical methods was drawn up, including both analytical and macromolecular techniques. Various chemical and spectroscopic analyses provide accurate determination of the cationic exchange capacity (CEC) and enable appropriate methods to be selected in order to obtain rapid and precise information about ionomers. Macromolecular characterizations, i.e. macromolecular weight distribution and ramifications are essential. In the context of our study, they allowed the degradations of polymer skeleton occurring during sulfonation to be observed both at the laboratory and pilot scales. This set of characterizations should enable optimization of both the performance and the lifespan of membranes designed for proton exchange membrane fuel cells (PEMFC) and direct methanol fuel cells (DMFC) energy sources.

HAL (Le Centre pour la Communication Scientifique Directe), May 30, 2021

International audienc

Polymer Science Series B, Dec 1, 2009

New poly(arylene ethers) containing side sulfo groups have been synthesized through the copoly co... more New poly(arylene ethers) containing side sulfo groups have been synthesized through the copoly condensation of 3,5 dinitrodiphenyl sulfone 4' sulfonic acid and 4,4' dichlorodiphenyl sulfone with bicyclic aromatic bisphenols under the conditions of aromatic nucleophilic substitution. On the basis of the blends of these copolymers with sulfonated poly(arylene ester ether ketone), membranes with satisfactory mechanical characteristics and high proton conductivity have been prepared.

Journal of Industrial and Engineering Chemistry, Jun 1, 2023

Meeting abstracts, 2017

In PEM Fuel Cells, Ionic liquids i.e. Proton-conducting Ionic Liquids, PILs, behave as proton-con... more In PEM Fuel Cells, Ionic liquids i.e. Proton-conducting Ionic Liquids, PILs, behave as proton-conducting materials to increase PEMFC operating temperature. Based on primary, secondary or tertiary ammoniums, they are ‘self-sufficient’ i.e. they don´t require any additional acids to perform the electrochemical reactions. Thus macroporous membranes have been successfully filled by PILs. Alternatively, PILs can be too associated to proton-conducting ionomers e.g. Nafion® or high performance based ionomers beforehand turned into their ammonium form in order to avoid molecular acid release. In the first case, high mechanical strength can be obtained while the swelling of PFSA ionomers by PILs increase markedly the proton-conductivity at the anhydrous state but strongly decrease the membrane mechanical strength. While PILs are self-sufficient in electrochemical conversion (FC), usual Li-ion battery ILs based on quaternary ammonium require conversely adding a lithium salt. The well-known advantages of ILs vs liquid solvents e.g. high Fp and high sub-ambient conductivities are partly compensated by the compulsory addition of the salt, which increases the viscosity and also the electrolyte cost. Oligoethers i.e. oligo(oxyethylene) or oligo-PEO) end-capped by 1, 2 or 3 salt moieties doesn’t match the performances of classical ionic liquids, in terms of sub-ambient conductivities but they both provide the lithium salt function and a solvating ability. This presentation will focus on new lithium-conducting oligomeric ionic liquids consisting of several oligoether chain lengths end-capped by organic perfluorinated anions. Their intrinsic ionic conductivities and those of related POE blends will be reported as well as their cationic transference numbers. Both classical ILs and oligomeric lithium-conducting ionic liquids degrading the electrolyte mechanical performances, they don´t allow thinning the polymer electrolyte films. A special attention will be paid to the reinforcement of ILs based polymer electrolytes.

ACS applied energy materials, Jun 2, 2022

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Electrochimica Acta, Dec 1, 2011

Lithium pentafluorobenzene sulfonate was synthesized by a protocol whereby pollution by aromatic ... more Lithium pentafluorobenzene sulfonate was synthesized by a protocol whereby pollution by aromatic nucleophilic substitutions on the perfluorinated ring was avoided. Its poly(oxyethylene) complexes, although less conductive than lithium imide complexes, provided cationic transference numbers higher than 0.5. Surprisingly, even at fairly low concentrations, this salt markedly increased the mechanical properties of the polymer electrolyte. This effect was attributed to telechelic interactions of the ion pairs with distinct polyether chains and is in agreement with the high cationic transference numbers.

Journal of Solid State Electrochemistry, Jan 18, 2021

Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lit... more Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lithium-metal batteries employing high capacity, transition metal oxide-positive electrodes. Herein, we report the investigation of lithium-metal battery cells comprising Li[Ni 0.6 Mn 0.2 Co 0.2 ]O 2 as active material for the positive electrode and a poly(arylene ether sulfone)-based singleion conductor as the electrolyte incorporating ethylene carbonate (EC) as selectively coordinating molecular transporter. The resulting lithium-metal battery cells provide very stable cycling for more than 300 cycles accompanied by excellent average Coulombic efficiency (99.95%) at an anodic cutoff potential of 4.2 V. To further increase the achievable energy density, the stepwise increase to 4.3 V and 4.4 V is herein investigated, highlighting that the polymer electrolyte offers comparable cycling stability, at least, as common liquid organic electrolytes. Moreover, the impact of temperature and the EC content on the rate capability is evaluated, showing that the cells with a higher EC content offer a capacity retention at 2C rate equal to 61% of the capacity recorded at 0.05 C at 60°C.

Membranes, May 18, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

High Performance Polymers, Dec 11, 2007

Magnetite nanoparticles (MNPs) were prepared by co-precipitation method and were found to have av... more Magnetite nanoparticles (MNPs) were prepared by co-precipitation method and were found to have average size of 5 nm with spherical shape crystalline structure with super-magnetic properties. Commercial polystyrene (PS) was sulfonated through the reaction with freshly prepared acetyl sulfate. Three different degrees of sulfonation, based on the ratio of the acetyl sulfate to polystyrene, were prepared (1:1, 1:3 and 1:5). Nanocomposites of the prepared magnetite nanoparticles 1:3 sulfonated polystyrene were prepared at different magnetite content (1, 5 and 10%). The produced materials were characterized by dynamic light scattering (DLS), transmittance electron microscope (TEM) X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). PS, MNPs and the prepared nanocomposites were investigated as adsorbents for Congo Red (CR). The variables influencing the adsorption capacity, such as solution pH, contact time and the initial dye concentration were systematically investigated. The adsorption for CR by the previous adsorbents show maximum experimental uptake capacity of 26.78, 33.15, 53.35, 64.73, and 76.29 mg/g for PS, MNPs, SPS/MNPs 1%, SPS/MNPs 5% and SPS/MNPs 10%, respectively. The adsorption process was found to follow the pseudo second order kinetic model and fit quite well with Langmuir adsorption isotherm.

HAL (Le Centre pour la Communication Scientifique Directe), Sep 20, 2021

Membranes

Composite anion-exchange membranes (AEMs) consisting of a porous substrate and a vinyl imidazoliu... more Composite anion-exchange membranes (AEMs) consisting of a porous substrate and a vinyl imidazolium poly(phenylene oxide) (VIMPPO)/acrylamide copolymer layer were fabricated in a straightforward process, for use in redox flow batteries. The porous substrate was coated with a mixture of VIMPPO and acrylamide monomers, then subsequently exposed to UV irradiation, in order to obtain a radically cured ion-exchange coating. Combining VIMPPO with low-value reagents allowed to significantly reduce the amount of synthesized ionomer used to fabricate the mem- brane down to 15%. Varying the VIMPPO content also allowed tuning the ionic transport properties of the resulting AEM. A series of membranes with different VIMPPO/acrylamides ratios were prepared to assess the optimal composition by studying the changes of membranes properties—water uptake, area resistivity, permeability, and chemical stability. Characterization of the membranes was followed by cycling experiments in a vanadium RFB (VRFB...

Physical Chemistry Chemical Physics

The solvation structure and ionic conductivity of Ca(TFSI)2/tetraglyme solutions were studied usi... more The solvation structure and ionic conductivity of Ca(TFSI)2/tetraglyme solutions were studied using a combination of experimental and theoretical approaches. A higher fraction of free ions was detected in solutions with higher molar concentrations.

Molecules, 2021

The membrane is a crucial component of Zn slurry–air flow battery since it provides ionic conduct... more The membrane is a crucial component of Zn slurry–air flow battery since it provides ionic conductivity between the electrodes while avoiding the mixing of the two compartments. Herein, six commercial membranes (Cellophane™ 350PØØ, Zirfon®, Fumatech® PBI, Celgard® 3501, 3401 and 5550) were first characterized in terms of electrolyte uptake, ion conductivity and zincate ion crossover, and tested in Zn slurry–air flow battery. The peak power density of the battery employing the membranes was found to depend on the in-situ cell resistance. Among them, the cell using Celgard® 3501 membrane, with in-situ area resistance of 2 Ω cm2 at room temperature displayed the highest peak power density (90 mW cm−2). However, due to the porous nature of most of these membranes, a significant crossover of zincate ions was observed. To address this issue, an ion-selective ionomer containing modified poly(phenylene oxide) (PPO) and N-spirocyclic quaternary ammonium monomer was coated on a Celgard® 3501 m...

Membranes, 2021

Flexible cross-linked anion exchange membranes (AEMs) based on poly (p-phenylene oxide) grafted w... more Flexible cross-linked anion exchange membranes (AEMs) based on poly (p-phenylene oxide) grafted with N-spirocyclic quaternary ammonium cations were synthesized via UV-induced free-radical polymerization by using diallylpiperidinium chloride as an ionic monomer. Five membranes with ion exchange capacity (IEC) varying between 1.5 to 2.8 mmol Cl−·g−1 polymer were obtained and the correlation between IEC, water uptake, state of water in the membrane and ionic conductivity was studied. In the second part of this study, the influence of properties of four of these membranes on cell cycling stability and performance was investigated in an aqueous organic redox flow battery (AORFB) employing dimethyl viologen (MV) and N,N,N-2,2,6,6-heptamethylpiperidinyl oxy-4-ammonium chloride (TMA-TEMPO). The influence of membrane properties on cell cycling stability and performance was studied. At low-current density (20 mA·cm−2), the best capacity retention was obtained with lower IEC membranes for whic...

L'invention concerne un procede de preparation de suif onylimidures aromatiques, les suif ony... more L'invention concerne un procede de preparation de suif onylimidures aromatiques, les suif onylimidures obtenus, et leur utilisation comme sel d'un electrolyte. Les suif onylimidure repondent a la formule formule [R-SO2-N-SO2R']rM (I). R' est un groupe ArZL-. R' est un groupe perfluoroalkyle ou un groupe ArZL-. Z est un groupe S, SO, ou SO2. L est un groupe - (CF2) n-CFRf-. n est 0 ou 1; Rf represente F ou groupe perfluoroalkyle en C1 a C8; Ar est un groupement aromatique. M represente H, un cation de metal alcalin, de metal alcalino-terreux, de metal trivalent ou tetravalent, ou un cation organique. Le procede consiste a preparer un compose RSO2N (R') SO2R' a partir de RSO2F, et a remplacer le groupe R' par une reaction de substitution nucleophile pour obtenir le compose (I), R' etant un groupe benzyle ou trimethylsilyle.

Journal of Solid State Electrochemistry, 2021

Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lit... more Polymer-based electrolytes potentially enable enhanced safety and increased energy density of lithium-metal batteries employing high capacity, transition metal oxide–positive electrodes. Herein, we report the investigation of lithium-metal battery cells comprising Li[Ni0.6Mn0.2Co0.2]O2 as active material for the positive electrode and a poly(arylene ether sulfone)-based single-ion conductor as the electrolyte incorporating ethylene carbonate (EC) as selectively coordinating molecular transporter. The resulting lithium-metal battery cells provide very stable cycling for more than 300 cycles accompanied by excellent average Coulombic efficiency (99.95%) at an anodic cutoff potential of 4.2 V. To further increase the achievable energy density, the stepwise increase to 4.3 V and 4.4 V is herein investigated, highlighting that the polymer electrolyte offers comparable cycling stability, at least, as common liquid organic electrolytes. Moreover, the impact of temperature and the EC conten...