构建Nano-Interlayer 阻断接口降解向基于高压PEO的全固态电池的接口降解
Pengfei Zhai1, Shuangquan Qu2, Niaz Ahmad1,3
1Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|May 7, 2024
概括
这项研究解决了固态聚合物金属电池的界面不稳定性,通过对高压阴极涂上LiNb0.6Ti0.5O3 (LNTO) 层. 这种LNTO涂层有效地减轻了副作用,并提高了电池的寿命.
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:
- 固态聚合物电解质 (SPEs) 和高压阴极之间的界面不稳定性限制了全固态聚合物金属电池 (ASSPLB) 的性能.
- 在阴极-SPE接口的副作用反应产生的气体产生导致接触损失,进一步降解ASSPLBs.
研究的目的:
- 调查界面副作用反应和气体生成在ASSPLB降解中的作用.
- 开发用于高压阴极的保护涂层,以提高ASSPLB的稳定性和寿命.
主要方法:
- 涂层LiNi0.83Co0.07Mn0.1O2 (NCM83) 阴极与LiNb0.6Ti0.5O3 (LNTO),以创建一个修改后的阴极 (CNCM83).
- 分析LNTO涂层对界面侧反应,SPE分解,阴极稳定性和界面电阻的影响.
- 评估ASSPLB的电化学性能和循环稳定性,使用修改过的阴极.
主要成果:
- LNTO涂层有效地减少了SPE分解,并防止了NCM83阴极中有害的相位过渡和裂.
- 阴极-SPE接口的气体生成和空隙形成受到LNTO层的显著缓解.
- 修改后的阴极的界面电阻增长率从37.6 Ω h-0.5降至2.4 Ω h-0.5.
- 带有CNCM83阴极的ASSPLB显示出出色的循环性,在4.2V的300个循环后保持75%的容量.
结论:
- 用LNTO涂层高压阴极是一种有前途的策略,用于抑制基于PEO的ASSPLB中的接口副作用和气体生成.
- 该LNTO层增强了阴极-电解质接口的稳定性,从而提高了电池的寿命和高压性能.
- 这种方法为开发持久且高能量密度的全固态聚合物金属电池提供了可行的解决方案.
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