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湿化学路线到Li₃InCl₆:微结构控制使高离子导电性和增强全固态电池性能

Jacob Otabil Bonsu¹, Abhirup Bhadra¹, Dipan Kundu^1,2

¹School of Chemical Engineering, UNSW Sydney, Kensington, NSW 2052, Australia.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|July 8, 2024

概括

一种新的湿化学方法增强了化固体电解质 (SE) 对于全固态电池 (ASSLBs). 这种方法显著提高了离子导电性,提高了电池性能,为更安全,更高效的能源存储铺平了道路.

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:

化物固体电解质 (SE) 对全固态电池 (ASSLB) 是有前途的,因为它们的超离子导电性和与高压阴极的兼容性.
目前的化物SE通常表现出低于理论预测和硫化物电解质的Li+导电性.
微结构特征,如粒度边界和微流,极大地影响离子导电性,但很少得到优化.

研究的目的:

开发一种可扩展和易于湿化学合成的高导电性Li3InCl6.6.
为了研究近离子溶剂对微观结构特征和离子导电性的影响.
为了评估在ASSLB全细胞中优化Li3InCl6的性能.

主要方法:

使用湿化学方法合成Li3InCl6.
使用近溶剂来控制谷物边界形成并减少微流.
电化学阻抗光谱法用于测量离子导电性.
使用LiNi0.6Mn0.2Co0.2O2阴极的全电池被组装和测试.

主要成果:

湿化学方法产生了高导电性Li3InCl6 (>2 mS cm-1).
接近溶剂处理减少了粒边界和微流,在22°C时达到离子导电率>4mS cm-1.
最小化的粒度边界改善了水分稳定性和固体-固体接口接触.
完整细胞在室温下表现出稳定的循环 (155mAhg-1在0.2°C) 和在60°C下表现出很好的长期稳定性 (1000个循环后85%的保留率,99.75%的库伦比效率).

结论:

接近溶剂介导合成是一种可行的生产高质量的Li3InCl6的途径,具有增强的离子导电性.
优化微结构控制对于改善ASSLB中化物固体电解质的性能至关重要.
开发的Li3InCl6显示出在高性能全固态电池中实际应用的巨大潜力.

关键词:

所有固态电池都是固态电池.亚普罗蒂克溶剂介导可扩展合成化物固体电解质的电解质高离子导电性的高离子导电性.微观结构特征微观结构特征

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