An electrochemical study of PEO:LiBF4−glass composite electrolytes (original) (raw)
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Characteristics of a poly (ethylene oxide)-LiBF4 polymer electrolyte
The poly(ethylene oxide)-lithium tetrafluoborate complex, (PEO)7LiBF 4, has been characterized in terms of total and electronic conductivity, lithium transport number, stability versus lithium electrode and thermal properties. The results indicate that this polymeric electrolyte offers promises of application in lithium-based electrochemical devices.
Structural evolution and conductivity of PEO:LiBF4–MgO composite electrolytes
Electrochimica Acta, 2001
This paper explores and proposes a structure-conductivity correlation in the PEO:LiBF 4 -MgO composite electrolyte system. The proposed correlation is derived from interpretations of DSC and conductivity measurements. Thermal cycling in the 0-100°C range yields an amorphous polymer structure believed to be beneficial for enhanced conductivity. The proposed roles of MgO are to depress the PEO melting temperature and retard the kinetics of its crystallization. A resistivity relaxation or conductivity enhancement below the melting temperature of PEO (68°C) occurs, which appears to be a characteristic of these electrolytes and related to an interaction of dipoles associated with polymer chains and MgO. A higher concentration ( # 30%) of MgO leads to its segregation and reduction in conductivity resulting from crystallization of PEO.
Electrochimica Acta, 2004
The results of an investigation of a polymer electrolyte system based on the poly(trimethylene carbonate) host matrix, designated as p(TMC), with lithium tetrafluoroborate guest salt are described in this presentation. Electrolytes with lithium salt compositions with n between 3 and 80 (where n represents the number of (O=COCH 2 CH 2 CH 2 O) units per lithium ion) were prepared by co-dissolution of salt and polymer in anhydrous tetrahydrofuran. The homogeneous solutions obtained by this procedure were evaporated, within a preparative glovebox and under a dry argon atmosphere, to form thin films of electrolyte.
Structural, Thermal and Conductivity Studies of PAN-LIBF4 Polymer Electrolytes
2016
The polymer electrolytes with various compositions of Polyacrylonitrile/N-N Dimethylformamide (DMF)/Lithiumtetrafluoroborate (LiBF4) are synthesized by solution casting technique. The free standing, clear and transparent 60-80 micron thick films are formed. The promising structural and complexation changes in polymer electrolytes have been explored by X-ray diffraction (XRD) and Fourier transform infra-red (FTIR) techniques. The thermal properties of all solid polymer electrolytes (SPE) were studied by Thermo gravimetric Analyzer (TGA) and Differential Thermal Analyzer (DTA). The electrical properties, i.e., ionic conductivity of solid polymer electrolytes has been measured as a function of temperature and composition. A Polymer membrane for 3 wt. % of salt has a conductivity of 3.06x10 mScm at room temperature and 1.53x10 mScm at 358K. The conductivity values increased with increase in temperature and offered an ionic conductivity of the order of 10 mScm at temperatures 358K. Activ...
2013
The electrochemical properties of a composite solid polymer electrolyte, consisting of poly(ethylene oxide) (PEO)-lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and tetraethylene glycol dimethyl ether (TEGDME) was examined as a protective layer between lithium metal and a water-stable lithium ion-conducting glass ceramic of Li 1+x+y (Ti,Ge) 2−x Al x P 3−y Si y O 12 (LTAP). The lithium ion conductivity and salt diffusion coefficient of PEO 18 LiTFSI were dramatically enhanced by the addition of TEGDME. The water-stable lithium electrode with PEO 18 LiTFSI-2TEGDME, as the protective layer, exhibited a low and stable electrode resistance of 85 Ω•cm 2 at 60 °C, after 28 days, and low overpotentials of 0.3 V for lithium plating and 0.4 V for lithium stripping at 4.0 mA•cm −2 and 60 °C. A Li/PEO 18 LiTFSI-2TEGDME/LTAP/saturated LiCl aqueous solution/Pt, air cell showed excellent cyclability up to 100 cycles at 2.0 mAh•cm −2 .
International Journal of Chemical Engineering and Applications, 2015
Solid polymer electrolyte for lithium ion batteries consisting of polyethylene oxide (PEO) and lithium trifluoromethanesulfonate (LiCF 3 SO 3) was prepared by a ball milling method followed by a hot pressing process. Various contents of Li salts (5, 10, 15 and 20 wt %) were studied. The samples were investigated for crystallinity and glass transition temperature by DSC and ionic conductivity was measured by the impedance. XRD patterns confirmed the degree of crystallinity of solid polymer electrolyte. The mechanical property was measured by tensile testing machine. It was found that the PEO composite that composed of 15 wt% of LiCF 3 SO 3 exhibited the highest conductivity at room temperature as 1.00 × 10-6 Scm-1 , whereas the glass transition temperature (T g), the melting temperature (T m) and the degree of crystallinity decreased with the increasing of Li salt content.
Effect of calixpyrrole in PEO–LiBF 4 polymer electrolytes
Electrochimica Acta, 2005
It is shown that the addition of calix[6]pyrrole to polyether based electrolytes doped with LiBF 4 results in an considerable increase in the cation transport number t Li + as confirmed by dc-ac current techniques as well as by PFG NMR studies. The value of t Li + in composite electrolytes beyond a certain minimum value weakly depends on the concentration of added calix[6]pyrrole. The increase in lithium transference number is associated with a decrease in ionic conductivity of composite polymeric electrolytes compared to the pure PEO-LiBF 4 systems.
Membranes, 2013
The electrochemical properties of a composite solid polymer electrolyte, consisting of poly(ethylene oxide) (PEO)-lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and tetraethylene glycol dimethyl ether (TEGDME) was examined as a protective layer between lithium metal and a water-stable lithium ion-conducting glass ceramic of Li1+x+y(Ti,Ge)2-xAlxP3-ySiyO12 (LTAP). The lithium ion conductivity and salt diffusion coefficient of PEO18LiTFSI were dramatically enhanced by the addition of TEGDME. The water-stable lithium electrode with PEO18LiTFSI-2TEGDME, as the protective layer, exhibited a low and stable electrode resistance of 85 Ω·cm2 at 60 °C, after 28 days, and low overpotentials of 0.3 V for lithium plating and 0.4 V for lithium stripping at 4.0 mA·cm-2 and 60 °C. A Li/PEO18LiTFSI-2TEGDME/LTAP/saturated LiCl aqueous solution/Pt, air cell showed excellent cyclability up to 100 cycles at 2.0 mAh·cm-2.
Nanocomposite, PEO-LiBOB polymer electrolytes for low temperature, lithium rechargeable batteries
2006
Polymer electrolytes formed by dispersing a low particle size Al 2 O 3 ceramic filler in a PEO-lithium bis(oxalato)borate, LiBOB matrix, are here presented and discussed. The results demonstrate that these composite electrolytes have unique features which include an extended temperature range of high ionic conductivity, a wide electrochemical stability window and a good control of the lithium metal electrode interface. These features make the electrolyte quite convenient for the development of advanced, solid-state, rechargeable lithium polymer batteries.