通过多个电离子诱导的顺序到乱序过渡,使分层氧化物阴极具有接近零菌株的行为
Jianhua Zhang1, Wenbin Li1, Jiayi Yang2
1Key Laboratory of Advanced Batteries Materials for Electric Vehicles of China Petroleum and Chemical Industry Federation, Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 28, 2024
概括
在双层V2O5中多个金属离子的预间隔破坏了有序结构,增强了离子的扩散和储存. 这种新的方法创造了无序的结构,以提高阴极性能.
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
- 固态化学 固态化学
背景情况:
- 带有预间接离子的格子工程提高了电子导电性,层间距离和稳定性,在分层氧化物阴极中.
- 单元金属离子预间隙导致有序的超结构,限制了晶格呼吸和离子储存/扩散.
研究的目的:
- 开发一种多重金属离子预插入策略,以打破阴离子/空隙有序的超结构.
- 为了研究双层V2O5 (NiCoZnVO) 中同时发生的Ni,Co和Zn三元离子预插曲对其电化学性能的影响.
主要方法:
- 化学预先将Ni,Co和Zn三元离子插入到双层V2O5.5的间层空间中.
- 使用实验和理论方法分析由此产生的离子/空位无序结构.
- 评估离子扩散通路,储能和NiCoZnVO阴极的结构稳定性.
主要成果:
- 在NiCoZnVO样本中,由于Ni-Co轨道合和Co-Zn/Ni-Zn排斥,呈现出离子/空位结构失序.
- 离子扩散屏障减少,扩散维度从1D增加到2D.
- 协同前间隙诱导预应力,导致在循环过程中形成近乎零应变的结构.
- 离子稳定了晶格,而CO和Zn离子激活了更多的Li+储存反应.
结论:
- 多个金属离子的预间接有效地打破了有序的超结构,使离子扩散和储存得到了增强.
- 离子/空位失序的NiCoZnVO阴极在储能应用中表现出卓越的电化学性能.
- 这种方法为设计具有提高性能的先进阴极材料提供了一个有希望的策略.
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