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探索硫化物固态电池中丰富的阴极的堆叠压力诱导的机械故障

Yiman Feng¹, Zhixing Wang¹, Gui Luo²

¹National Energy Metal Resources and New Materials Key Laboratory, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, School of Metallurgy and Environment, Central South University Changsha 410083 China wangjiexikeen@csu.edu.cn.

Chemical science

|January 14, 2026

概括

在全固态电池 (ASSLB) 中优化堆叠压力至关重要. 适度的压力通过降低阻力来提高性能,但过度的压力会导致Ni丰富的层状氧化物阴极的机械降解和容量衰减.

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
电池技术电池技术

背景情况:

全固态电池 (ASSLB) 配有富含Ni的层氧化物阴极 (NRLOs) 和硫化物固态电解质 (SSEs),提供高能量密度和安全性.
堆叠压力对这些电池中NRLOs的机械影响尚不清楚.

研究的目的:

系统地研究堆叠压力对硫化物ASSLB中NRLOs化学机械降解的影响.
了解堆叠压力如何影响接口特性和降解机制.

主要方法:

用不同的堆叠压力对ASSLB进行电化学测试.
分析材料降解的多维表征技术.
使用印 (LiIn) 和酸 (LTO) 阳极进行的研究.

主要成果:

增加堆叠压力减少了接口空隙和离子传输阻力,改善了ASSLB的性能.
过度堆叠压力导致应力度,格子扭曲,氧气释放和SSE分解.
降解包括NRLO粒子碎片化和电极间层裂纹,导致容量色和阻抗增加.

结论:

堆叠压力显著影响ASSLB的性能和耐用性.
优化堆叠压力对于平衡接口接触和机械应力至关重要,以提高硫化物ASSLB的寿命.

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