Identifying the Critical Role of Li Substitution in P2− Nax[LiyNizMn1−y−z]O2 (0 < x, y, z < 1) Intercalation Cathode Materials for High-Energy Na-Ion Batteries (original) (raw)
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Designing high-capacity cathode materials for sodium-ion batteries
Na-rich layered oxides as cathode materials for sodium-ion batteries were designed using an electrochemical method based on Li-rich layered oxides. The materials show high specific capacity that can reach 234 mAh/g at a current of 5 mA/g. The energy density of this material (644 Wh/kg) is even higher than those of commercial cathodes for lithium-ion batteries, such as LiFePO 4 and LiMn 2 O 4 . Kinetic analysis of Na + insertion/extraction into/from the Na-rich layered oxide reveals that the Na + diffusion coefficient is about 10 −14 cm 2 /s.
NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020, 2021
In this study, we have introduced a promising cathode material for Na-ion battery with high weight percent of Na. This material can have a tunable voltage profile and specific capacity owing to the number of available Na-ions for the redox process. We have found the formation energies of different configurations of Na5NiCO5 with varying Na concentration and constructed the voltage profile. The material has comparable voltage as well as stability during the desodiation process. The involvement of O in the redox activity apart from the usual transition metal, is also analyzed.
Update on Na-based battery materials. A growing research path
Energy & Environmental Science, 2013
This work presents an up-to-date information on Na-based battery materials. On the one hand, it explores the feasibility of two novel energy storage systems: Na-aqueous batteries and Na-O 2 technology. On the other hand, it summarises new advances on non-aqueous Na-ion systems. Although all of them can be placed under the umbrella of Na-based systems, aqueous and oxygen-based batteries are arising technologies with increasing significance in energy storage research, while non-aqueous sodium-ion technology has become one of the most important research lines in this field. These systems meet different requirements of energy storage: Na-aqueous batteries will have a determining role as a low cost and safer technology; Na-O 2 systems can be the key technology to overcome the need for high energy density storage devices; and non-aqueous Na-ion batteries have application in the field of stationary energy storage.
Journal of the American Chemical Society, 2019
While sodium-ion batteries (SIBs) hold great promise for large-scale electric energy storage and low speed electric vehicles, the poor capacity retention of the cathode is one of the bottlenecks in the development of SIBs. Following a strategy of using lithium doping in the transition-metal layer to stabilize the desodiated structure, we have designed and successfully synthesized a novel layered oxide cathode P2− Na 0.66 Li 0.18 Fe 0.12 Mn 0.7 O 2 , which demonstrated a high capacity of 190 mAh g −1 and a remarkably high capacity retention of ∼87% after 80 cycles within a wide voltage range of 1.5−4.5 V. The outstanding stability is attributed to the reversible migration of lithium during cycling and the elimination of the detrimental P2−O2 phase transition, revealed by ex situ and in situ X-ray diffraction and solid-state nuclear magnetic resonance spectroscopy.
Co-Free P2–Na0.67Mn0.6Fe0.25Al0.15O2 as Promising Cathode Material for Sodium-Ion Batteries
ACS Applied Energy Materials, 2018
P2-Na 0.67 Mn 0.6 Fe 0.25 Al 0.15 O 2 (NaMFA) was developed as cheaper and lesstoxic cathode material for sodium-ion batteries than the Co analogous, P2-Na 0.67 Mn 0.6 Fe 0.25 Co 0.15 O 2 (NaMFC). Despite cobalt being considered to stabilize layered structures upon cycling, NaMFA proved to have not only a higher specific charge 163 mAh•g-1 compared to 141 mAh•g-1 at 0.1C rate, but also a better cycling stability and rate capability than NaMFC. The structural transitions occurring during sodiation/desodiation in the layered frames were characterized by operando X-ray
Journal of the American Chemical Society, 2017
Large-scale electric energy storage is fundamental to the use of renewable energy. Recently, research and development efforts on room-temperature sodium-ion batteries (NIBs) have been revitalized, as NIBs are considered promising, low-cost alternatives to the current Li-ion battery technology for large-scale applications. Herein, we introduce a novel layered oxide cathode material, Na0.78Ni0.23Mn0.69O2. This new compound provides a high reversible capacity of 138 mAh g(-1) and an average potential of 3.25 V vs Na(+)/Na with a single smooth voltage profile. Its remarkable rate and cycling performances are attributed to the elimination of the P2-O2 phase transition upon cycling to 4.5 V. The first charge process yields an abnormally excess capacity, which has yet to be observed in other P2 layered oxides. Metal K-edge XANES results show that the major charge compensation at the metal site during Na-ion deintercalation is achieved via the oxidation of nickel (Ni(2+)) ions, whereas, to ...
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Manufacturing sustainable sodium ion batteries with high energy density and cyclability requires a uniquely tailored technology and a close attention to the economical and environmental factors. In this work, we summarized the most important design metrics in sodium ion batteries with the emphasis on cathode materials and outlined a transparent data reporting approach based on common metrics for performance evaluation of future technologies.Sodium-ion batteries are considered as one of the most promising alternatives to lithium-based battery technologies. Despite the growing research in this field, the implementation of this technology has been practically hindered due to a lack of high energy density cathode materials with a long cycle-life. In this perspective, we first provide an overview of the milestones in the development of Na-ion battery (NIB) systems over time. Next, we discuss critical metrics in extraction of key elements used in NIB cathode materials which may impact the...