结合LiCoO2和双层电解质的多元元素兴奋剂,用于4.6V高压全固态电池
Guozhong Lu1, Jiaxing Lv1, Xiang Wu1
1Shanghai Key Laboratory of Magnetic Resonance, Institute of Magnetic Resonance and Molecular Imaging in Medicine, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, P. R. China.
The journal of physical chemistry letters
|March 14, 2025
概括
对氧化 (LiCoO2) 阴极的新兴兴奋剂策略有效地抑制相位过渡和氧氧还氧反应. 这提高了高压全固态电池的性能,使周期寿命更长.
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:
- 固态电池的接口问题,特别是LiCoO2阴极和Li6PS5Cl等固体电解质之间的问题,阻碍了性能.
- 以前提出的化物电解质Li3InCl6作为屏障层,由于高电压 (4.6V) 的氧氧还氧化和LiCoO2相过渡,证明无效.
研究的目的:
- 为了克服Li3InCl6作为高压全固态电池中LiCoO2阴极的屏障层的局限性.
- 为了抑制不可逆转的相位过渡,并调节LiCoO2.2.中的表面氧价值.
- 为了提高4.6V LiCoO2全固态电池的电化学性能和循环稳定性.
主要方法:
- 研究了Li3InCl6作为LiCoO2阴极的屏障层的无效性.
- 引入了对LiCoO2的Ti-Mg-Al兴奋剂策略,以稳定其结构和表面.
- 使用双层电解质设计与合的LiCoO2阴极一起使用.
主要成果:
- -Mg-Al兴奋剂有效地抑制了 LiCoO2 在高电压下不可逆转的相位过渡.
- 兴奋剂显著降低了LiCoO2表面上低价值氧物种 (O^n-, n < 2) 的形成.
- 组合的兴奋剂策略和双层电解质实现了2200个周期的循环寿命,在4.6V下保持80%的容量.
结论:
- Ti-Mg-Al 兴奋剂策略是稳定高压 LiCoO2 阴极的可行方法.
- 这一策略有效地减轻了接口问题,并提高了所有固态电池的性能.
- 开发的系统显示了下一代高能量密度电池的有希望的潜力.
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