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电化学诱导的晶体变形转化为酸固体电解质,用于长期使用的金属电池

Ge Sun¹, Chenjie Lou², Boqian Yi¹

¹Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 130012, Changchun, China.

Nature communications

|October 16, 2023

概括

一种新的晶体固体电解质Na5SmSi4O12,使稳定的固态金属电池具有高导电性和长周期寿命. 它独特的晶体变异变化增强了性能和接口特性,用于先进的能量存储.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
固态化学固态化学

背景情况:

固态金属电池 (SSB) 需要具有高离子导电性,良好的界面兼容性和符合电极接触的固体电解质 (SE).
当前的SE通常面临着同时实现所有这些属性的挑战,这限制了SSB的性能和寿命.

研究的目的:

开发和描述一种新的晶体SE,Na5SmSi4O12,用于先进的SSB.
调查负责观察到的电化学性能的潜在机制.
为了在实际的SSB设备中展示这个SE的潜力.

主要方法:

结晶Na5SmSi4O12.2的合成和表征
对称细胞和全细胞的电化学测试 (Na
使用现场技术分析固体电解质接口,研究晶体变异.

主要成果:

Na5SmSi4O12 具有高的室温离子导电性 (2.9 × 10^-3 S cm^-1) 和低的激活能量 (0.15 eV).
对称的电池表现出极好的循环稳定性 (>800小时) 和高临界电流密度 (1.4 mA cm^-2).
SSB实现了超过4000个周期,没有容量损失,归因于电化学诱导的晶体变异.

结论:

Na5SmSi4O12是一种非常有前途的SE,用于长期使用和高性能SSB.
从晶体转变为形态的转换机制为设计高级SE提供了一条新的途径.
这项工作为商业化更安全,更高效的金属电池铺平了道路.

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