Effect Temperature for improving the Li-ion conductivity of Li7La3Zr2O12

Agnes Lakshmanan, Sabarinathan Venkatachalam
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引用次数: 0

Abstract

This study investigates the dissociation behavior of water-soluble salts of Li and La and the unique behavior of Zr sources, resulting in the generation of Li+, La3+, and Zr4+ ions in aqueous solutions. The specific conductivity of calcined SG1 and SG2 displays temperature-dependent variations, with SG1 consistently exhibiting higher conductivity (2.08 x 10-4 S/cm) across the temperature range. The closed-packed structure facilitates the controllable mass transfer of lithium, enhancing ionic conductivity. The constructed LiFePO4/LLZO/AC device using these electrolytes demonstrates an impressive energy density of 1.95 Wh/kg and a power density of 144.92 W/kg, showcasing an excellent solid electrode-electrolyte interphase. Over 10,000 cycles, cyclic stability, with an average performance of 86%, underscores the potential of LLZO as a solid electrolyte for advanced energy storage devices. The sol-gel synthesis and densification strategy is a simple and effective method for obtaining lithium-rich LLZO electrolytes. The enhanced ionic conductivity and electrochemical performance of the solid-state device emphasize the practical viability of this approach, contributing to the sustainable development of advanced energy storage technologies.
改善 Li7La3Zr2O12 锂离子传导性的效应温度
本研究调查了 Li 和 La 的水溶性盐的解离行为以及 Zr 源的独特行为,结果发现在水溶液中生成了 Li+、La3+ 和 Zr4+ 离子。煅烧 SG1 和 SG2 的比电导率随温度而变化,SG1 在整个温度范围内始终表现出较高的电导率(2.08 x 10-4 S/cm)。封闭式封装结构有利于锂的可控传质,从而提高了离子导电性。使用这些电解质构建的 LiFePO4/LLZO/AC 器件的能量密度高达 1.95 Wh/kg,功率密度为 144.92 W/kg,展示了出色的固体电极-电解质间相。循环稳定性超过 10,000 次,平均性能达到 86%,这凸显了 LLZO 作为固体电解质用于先进储能设备的潜力。溶胶-凝胶合成和致密化策略是获得富锂 LLZO 电解质的一种简单而有效的方法。固态器件离子电导率和电化学性能的提高强调了这种方法的实际可行性,有助于先进储能技术的可持续发展。
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