提升了4.5V LiCoO2的电化学性能,使用LiAlO2涂层通过一种新的化固化涂层方法进行涂层
Chong Ni1, Xuyong Feng1, Yuanyun Dou1
1School of Materials Science and Engineering, Engineering Research Center of High-Performance Copper Alloy Materials and Processing, Ministry of Education, Hefei University of Technology, Hefei, Anhui, 230009, China.
ChemSusChem
|June 4, 2025
概括
使用LiAlO2的新型化固化表面涂层增强了离子电池的阴极稳定性. 这种方法提高了LiCoO2和LiNi0.5Mn1.5O4阴极材料的循环性能.
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:
- 阴极材料和电解质之间的表面侧反应降低了电池的性能.
- 增强的循环稳定性对于先进的离子电池至关重要.
- 现有的表面改造方法往往面临着统一性和效率方面的挑战.
研究的目的:
- 为正极材料引入一种新的化固化表面涂层策略.
- 在LiCoO2和LiNi0.5Mn1.5O4表面上形成离子导电LiAlO2层.
- 为了提高这些正极材料的循环稳定性和电化学性能.
主要方法:
- 使用化固化工艺来沉积LiAlO2涂层.
- 使用扫描电子显微镜 (SEM),能量分散光谱仪 (EDS) 和传输电子显微镜 (TEM) 分析了表面形态和组成.
- 通过在各种速率和切断电压下进行循环测试来评估电化学性能.
主要成果:
- 在LiCoO2和LiNi0.5Mn1.5O4.4上确认了均和薄的LiAlO2涂层.
- 1%的LiAlO2涂层的LiCoO2在200个循环中保持了85%的容量 (相对于61%的未涂层).
- 有LiAlO2涂层的LiNi0.5Mn1.5O4在300个循环后保持了94.5%的容量 (与未涂层的64.6%相比).
结论:
- 化固化策略有效地形成了一层保护性LiAlO2层,抑制副作用.
- 这种表面涂层显著提高了LiCoO2和LiNi0.5Mn1.5O4阴极材料的循环稳定性.
- LiAlO2化固化方法在改善阴极性能方面表现出有效性和通用性.
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