对于高性能超高Ni分层阴极的多层晶体场效应
Lianshan Ni1, Hongyi Chen1, Jinqiang Gao1
1State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
ACS nano
|June 23, 2023
概括
反的修改增强了高能离子电池 (LIB) 的超高层阴极. 这一策略改善了结构稳定性和接口特性,提高了电池的性能和寿命.
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:
- 超高层阴极对于高能离子电池 (LIB) 是至关重要的.
- 循环过程中的结构和界面降解限制了它们的实际应用.
- 开发稳定的阴极材料对于下一代储能是必不可少的.
研究的目的:
- 为了提高LiNi0.94Co0.04Al0.02O2 (NCA) 阴极的结构和接口稳定性.
- 为了利用反的特性进行阴极改造.
- 提高高能LIB的性能和循环寿命.
主要方法:
- 使用Sb5+兴奋剂和Li7SbO6涂层对NCA阴极进行多功能修改.
- 研究原子/微结构重建和界面屏蔽.
- 使用同步龙X射线吸收光谱和扫描传输电子显微镜.
主要成果:
- 建立了一个强大的氧气框架,抑制了晶格氧气的演变.
- 实现了具有精细尺寸和 (003) 晶体纹理的半径对齐的初级粒子.
- 在现场构建的Li7SbO6层提高了接口稳定性和Li+动力学.
- 经过Sb修改的NCA阴极在1C的200个循环后显示出94.6%的容量保留,在10C的183.9 mAh g-1后显示出94.6%的容量保留.
结论:
- Sb 修改有效地提高了超高Ni NCA 阴极的结构完整性和接口特性.
- 结合的Sb兴奋剂和涂层策略为下一代先进的LIB提供了一个有希望的方法.
- 改进的电化学性能和稳定性为实际的高能LIB应用铺平了道路.
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