在厚厚的NMC111-阿吉罗第特固态阴极中,化梯度和扭曲性因素
Alyssa M Stavola1, Xiao Sun2, Dominick P Guida1
1Department of Chemical Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts02115, United States.
ACS energy letters
|November 9, 2023
概括
固态电池中的厚阴极在循环过程中显示分布不均. 优化阴极设计对于实际的全固态电池性能至关重要.
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:
- 全固态电池的高能量密度需要使用厚厚的阴极.
- 这些厚阴极必须在实际应用的标准条件下可逆运行.
研究的目的:
- 研究所有固态电池的厚复合材料阴极内的局部含量分布.
- 了解不同的材料负载如何影响的分布和性能.
主要方法:
- 利用高能深度分析的X射线衍射分析了在110微米厚的复合材料阴极上的分布.
- 采用微结构分析和阴极建模来将结构与电化学行为相关联.
- 研究的复合阴极由Li1-Ni1/3Mn1/3Co1/3O2 (NMC111) 和Li6PS5Cl (LPSC) 固体电解质组成,其循环速率为C/10.
主要成果:
- 在循环过程中,在复合材料正极的厚度上观察到大量的化梯度.
- 证明改变NMC111质量负载会影响这些化梯度的性质和严重程度.
- 确定了高曲度,特别是在固体电解质阶段,作为导致梯度的关键因素,在初始充电过程中曲度增加.
结论:
- 电流分布在硫化物基复合电极中很明显.
- 固体电解质阶段的高扭曲度显著影响的分布和电池性能.
- 这些发现对实践设计和优化具有厚阴极的全固态电池具有重要意义.
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