在Ni-丰富的层级阴极中界面化学反应的进化过程,用于全固态电池
Hexin Liu1, Xinyu Liu2, Zhenyu Wang2
1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.
ACS applied materials & interfaces
|December 26, 2023
概括
一项新的研究揭示了化学反应如何降解含丰富阴极的全固态电池 (ASSB). 用LiNbO3涂覆阴极显著提高了长期稳定性,在2000个循环后保持了82%的容量.
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:
- 全固态电池 (ASSB) 为电动汽车和便携式电子设备等应用提供了更高的安全性和能量密度.
- 富含的分层三元阴极 (NCM) 对ASSB来说是有前途的,但遭受了与固态电解质 (SSE) 的界面反应.
- 这些反应产生了副产品,增加了界面阻抗,限制了循环寿命.
研究的目的:
- 研究NCM阴极和SSEs之间的界面化学反应的形成机制,特性和动态演变.
- 了解这些反应对ASSB不可逆转的容量退化的影响.
- 制定一种保护策略,以提高基于NCM的ASSB的长周期稳定性.
主要方法:
- 在长期循环的各个阶段对ASSB组件的表征.
- 从阴极-电解质接口到散装阴极材料的化学反应动态演变的分析.
- 在NCM阴极上实施LiNbO3表面涂层,以创建一个被动化层.
主要成果:
- 详细的表征揭示了界面化学反应的动态演变及其对容量衰减的贡献.
- 该LiNbO3涂层有效地使阴极-电解质接口无能化,抑制有害的副作用反应.
- 涂层ASSB表现出了显著的长周期稳定性,在1C时2000个周期后保持82%的容量.
结论:
- 界面化学反应是限制基于NCM的ASSB循环寿命的关键因素.
- 一种LiNbO3表面涂层可以有效地保护这些反应,大大提高了电池的性能.
- 本研究提供了关于缓解界面问题的见解,用于开发稳定和高性能ASSB.
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