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Updated: Jul 23, 2025

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Published on: November 11, 2013

"双赢"对LiCoO₂的修改使得所有基于硫化物的固态电池的稳定和长寿命循环

Guozhong Lu¹, Ying Jiang¹, Xiang Wu¹

¹Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China.

|July 12, 2023

概括

这项研究开发了一种双重功能策略,用于修改全固态电池 (ASSLB) 的氧化 (LiCoO2) 阴极. 创新的表面涂层和梯度兴奋剂显著提高了电化学性能和循环寿命.

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
储能储能储能储能储能储能

背景情况:

氧化物阴极和硫化物固态电解质 (SSEs) 之间的接口侧反应和空间电荷层阻碍了全固态电池 (ASSLB) 的性能.
活性材料的结构降解进一步损害了ASSLB中的电化学效率.
表面涂层和散装兴奋剂是解决阴极-SSE接口问题和改善结构完整性的关键策略.

研究的目的:

开发一种成本效益高的,单步方法来修改LiCoO2 (LCO) 阴极.
为了减轻接口问题,并提高硫化物基ASSLB中的LCO阴极的结构稳定性.
提高ASSLBs的电化学性能和循环寿命.

主要方法:

使用异质Li2TiO3/Li(TiMg) 1/2O2表面涂层对LiCoO2 (LCO) 进行一阶段的低成本修改.
将散装梯度Mg合物纳入LCO结构.
在基于Li10GeP2S12的ASSLB中测试修改后的LCO阴极.

主要成果:

2TiO3和2TiMg1/2O2涂层有效地抑制了接口侧反应,并减弱了空间电荷层效应.
梯度Mg兴奋剂稳定了散装结构,防止过度充电时形成螺旋状相位.
经过修改的LCO阴极表现出极好的循环性能,在870个循环后保持80%的容量.

结论:

表面涂层和梯度兴奋剂的双功能策略在修改LCO阴极方面非常有效.
这种方法显著提高了基于硫化物的ASSLB的电化学性能和长期稳定性.
开发的方法有可能在ASSLB中大规模商业化实施阴极改造.

关键词:

所有固态电池都是固态电池.兴奋剂的使用兴奋剂的使用干燥涂层是一种干燥涂层.侧面反应侧面反应空间电荷层空间电荷层

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