在电解过程中,为改善电化学性能提供了无LiNiO2初级颗粒的工程方便,以提高电化学性能
Hongxiang Ji1,2,3, Ronghan Qiao1,2,3, Hailong Yu1,2,3
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
ACS applied materials & interfaces
|August 14, 2023
概括
使用兴奋剂设计氧化 (LiNiO2) 阴极材料的粒子形态,防止性能降低. 这种具有成本效益的方法提高了机械强度和电接触,这对于先进的电池至关重要.
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
- 无机化学 无机化学
背景情况:
- 高层氧化物阴极材料,如LiNiO2 (LNO),对于下一代电池至关重要.
- 由于H2-H3相变的降解会对LNO的电化学性能产生负面影响.
- 粒子形态工程对于减轻这些性能问题至关重要.
研究的目的:
- 开发一种具有成本效益和高效的方法来设计LiNiO2.2的粒子形态.
- 调查 (Nb) 兴奋剂在修改LNO粒子结构和特性中的作用.
- 为了提高LNO阴极材料的电化学性能和稳定性.
主要方法:
- 一种Ni(OH) 2前体的电解合成,添加了少量的Nb2O5.5.
- 使用先进的技术来分析Nb分布和粒子形态,对产生的LNO材料进行表征.
- 对工程LNO阴极的电化学性能和机械性能进行评估.
主要成果:
- 在前体合成期间的兴奋剂成功设计了LNO初级粒子形态.
- 在低度被纳入LNO网格,并以氧化的形式集中在初级粒子边界.
- 工程LNO (EMF-LNO) 显示了原始颗粒大小的减少,颗粒包装密度的增加,增强的机械强度和改进的电接触.
- 在循环过程中,EMF-LNO证明抑制了电解质透和减少了H2-H3相变效应.
结论:
- 使用Nb兴奋剂的电解介导形态工程 (EMF) 是改善LNO阴极材料的可行,简单和廉价策略.
- 工程粒子形态学增强了Co-free高Ni层氧化物阴极的稳定性和电化学性能.
- 这种方法为开发更耐用,更高效的电池技术提供了一个有希望的途径.
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