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破译基全固态电池中丰富阴极的离子界面迁移动力学

Chenxi Gao¹, Xiao Xu¹, Tiansheng Bai¹

¹State Key Laboratory of Advanced Welding and Joining, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.

ACS applied materials & interfaces

|December 18, 2024

概括

为了改进高能全固态电池 (ASSLB),研究人员用Si兴奋剂和Li4SiO4涂层稳定了富含的阴极. 这增强了界面离子迁移,提高了下一代电池的容量和循环稳定性.

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
固态电池固态电池是什么

背景情况:

富含的层氧化物是高能全固态电池 (ASSLB) 的关键阴极.
ASSLB面临的挑战包括较差的离子动力学,副作用反应和空间电荷层,限制性能.
在ASSLB中的容量损失与H2-H3相变和不一致的界面离子迁移有关.

研究的目的:

为解决ASSLBs的Ni丰富阴极的界面动力限制.
通过稳定散装结构和调节接口行为来提高丰富的阴极的性能.
为了更深入地了解ASSLBs的界面降解机制.

主要方法:

将 (Si) 兴奋剂纳入富含的阴极结构.
用快速离子导体Li4SiO4 (LSO) 涂覆阴极.
制造和电化学测试的修改NCM@LSO-2掌管Li6PS5Cl掌管Li-在ASSLBs.
动力分析和理论模拟来研究潜在的机制.

主要成果:

经过修改的NCM@LSO-2阴极在0.1C下提供了183.5mA h g-1的高可逆容量,比裸体电极提高了30.3%.
接口调节策略使得在5.0C的高速运行成为可能.
这些ASSLB表现出极好的循环稳定性,在1.0C的500个循环后,它们保持了大约85.8%的容量.

结论:

兴奋剂和LSO涂层有效地稳定了富含Ni的阴极,并调节了界面离子迁移.
开发的ASSLB系统在容量,速率能力和周期寿命方面取得了显著的改进.
这项工作提供了一种可行的策略,以克服Ni丰富的正极基ASSLBs的界面动力限制.

关键词:

H2H3相位过渡动力学在 Li4SiO4 接口层中,富含的阴极是什么接口调节接口调节基于硫化物完全固态电池的完全固态电池

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