增强脊柱LiNi0.5Mn1.5O4阴极中的轨道相互作用,用于高压和高速率离子电池
Tianji Fu1, Yujie Li1, Ziqing Yao1
1College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China.
Small (Weinheim an der Bergstrasse, Germany)
|May 28, 2024
概括
兴奋剂通过加强轨道相互作用来增强无 spinel LiNi0.5Mn1.5O4 (LNMO) 阴极材料. 这提高了离子电池的稳定性和性能,特别是在高温下.
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:
- 高压,无旋LiNi0.5Mn1.5O4 (LNMO) 是高功率离子电池的有前途的阴极材料.
- 不稳定性来自于弱过渡金属 (TM) 3d-氧 (O) 2p轨道相互作用,导致结构退化和不良循环,特别是在高温下.
研究的目的:
- 通过引入 (P) 兴奋剂来增强 LNMO 阴极中的轨道相互作用.
- 提高LNMO的结构稳定性和电化学性能,重点是抑制像Jahn-Teller效应这样的有害影响.
主要方法:
- 利用植物酸作为LNMO中均兴奋剂的P兴奋剂,创建了P兴奋剂的LNMO (P-LNMO).
- 研究了P兴奋剂对TM 3d-O 2p轨道相互作用和晶体结构稳定性的影响.
- 在P-LNMO材料和袋式电池中评估了电化学性能,包括放电能力,循环稳定性和速率能力.
主要成果:
- 在LNMO框架中,P-doping显著加强了TM 3d-O 2p轨道相互作用.
- 抑制了Jahn-Teller效应和Mn溶解,从而提高了结构完整性.
- 实现了卓越的电化学性能,包括高放电能力,稳定的循环和更好的速率能力.
- P-LNMO袋式电池表现出极好的循环稳定性,在100个循环后保持97.4%的容量.
结论:
- 通过植物酸进行兴奋剂是一种有效的策略,可以增强无LNMO阴极的轨道相互作用和稳定性.
- 改进的LNMO材料为开发高性能,持久的离子电池提供了可行的途径,特别适用于苛刻的应用.
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