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首页> 外文期刊>Advanced energy materials >Electrolytes toward High-Voltage Na_3V_2(PO_4)_2F_3 Positive Electrode Durable against Temperature Variation
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Electrolytes toward High-Voltage Na_3V_2(PO_4)_2F_3 Positive Electrode Durable against Temperature Variation

机译：电解于高压Na_3V_2（PO_4）_2F_3正电极耐用的温度变化

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摘要

High power and energy density, long cyclability, and tolerance for wide temperature (seasonal and daily operational temperature differences) must be considered to construct large-scale sodium secondary batteries. In this regard, Na3V2(PO4)(2)F-3(NVPF) has become a subject of interest as a high-performance positive electrode material owing to its high energy density. However, the high operating voltage of NVPF causes continuous decomposition of electrolytes during cycles, resulting in significant capacity fading and low Coulombic efficiency. In this study, the electrochemical performance of the NVPF electrode in organic solvent electrolytes with and without additives and an ionic liquid is investigated at high voltage regimes over a wide temperature range (-20 degrees C to 90 degrees C). The results reveal that the performance of organic electrolytes is still insufficient even with additives, and the ionic liquid electrolyte demonstrates high electrochemical stability and cyclability with NVPF electrodes over a temperature range from -20 degrees C to 90 degrees C, achieving stable cycling over 500 cycles. The detailed electrochemical analysis combined with X-ray photoelectron and energy dispersive X-ray spectroscopy indicates that a sturdy cathode electrolyte interphase layer around the electrode protects it from capacity fading at high voltage and elevated temperature, resulting in high Coulombic efficiency.
机译：必须考虑高功率和能量密度，长度的温度和季节性和日常操作温度差异的耐受性，以构建大型二次电池。在这方面，Na3v2（PO4）（2）F-3（NVPF）由于其高能量密度而成为一种高性能正极材料的兴趣。然而，NVPF的高工作电压在循环期间导致电解质的连续分解，导致显着的容量衰落和低库仑效率。在该研究中，在宽温度范围内的高压状态（-20℃至90℃），在具有和不含添加剂的有机溶剂电解质中的NVPF电极和离子液体的电化学性能。结果表明，即使添加剂，有机电解质的性能仍然不足，离子液体电解质在-20℃至90℃的温度范围内的温度范围内显示出高电化学稳定性和环状性，实现稳定的循环循环。 。结合X射线光电子和能量色散X射线光谱的详细电化学分析表明，电极周围的坚固阴极电解质相互相互作用层保护其在高电压和高温下的容量衰落，导致高库仑效率。

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