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通过双表面改造工程获得的基于Mn的丰富的分层氧化物作为离子电池的高性能阴极材料
Yanpeng Liu1, Yan Zhang1, Hongjie Tan2
1School of Materials and Energy, Lanzhou University, Lanzhou 730000, Gansu, P.R. China. pengshl@lzu.edu.cn.
Nanoscale
|June 19, 2025
概括
双重表面修改增强了富含的分层氧化物 (LLOs),以提高电池性能. 这种方法稳定材料,提高容量保留和循环稳定性在先进的储能应用中.
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:
- 富含的分层氧化物 (LLOs) 为储能提供高特异性容量 (>250 mA h g-1).
- 然而,LLOs由于不可逆转的晶格氧气损失和结构降解而遭受循环稳定性差.
研究的目的:
- 为了提高丰富的基材料的多重性性能和循环稳定性.
- 通过表面修改技术解决LLOs的退化问题.
主要方法:
- 双重表面处理,包括Li2O-2B2O3 (LBO) 涂层和氧气空隙修改.
- 通过空隙处理在现场生成表面旋转相.
- 使用XRD和拉曼光谱学进行表征,并计算扩散系数.
主要成果:
- 双表面修改成功构建了一个3D通道,并形成了一个表面旋转相,抑制氧气降解.
- 修改后的Li1·2Mn0·54Ni0·13Co0·13O2 (LB-M) 在0.2°C的100个循环后达到242.8mA hg−1,容量保持96.5%.
- 分析证实,多重性性能和循环稳定性得到了改善.
结论:
- 结合LBO涂层和氧气空位修改,有效地提高了LLO性能.
- 这种双表面工程策略为开发稳定和高性能LLO阴极提供了一个有前途的途径.
- 这些发现为改造丰富的基材料用于先进电池提供了新的见解.
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