集成批量Nb兴奋剂和F表面层,构建一个坚固的丰富的Mn基分层阴极,具有稳定的结构-接口合
Longren Guo1, Ming Jiang1, Leyan Yang1
1Institute of Carbon Neutrality and New Energy, School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|February 13, 2026
概括
这项研究通过结合Nb5+兴奋剂和改性来增强用于离子电池的丰富的分层氧化物阴极. 这一策略提高了结构稳定性和电化学性能,使电池寿命更长.
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:
- 富层氧化物 (LLOs) 为下一代离子电池 (LIB) 提供了高容量.
- 然而,LLOs在循环过程中遭受电压衰变,接口不稳定性和结构退化,限制了它们的实际使用.
研究的目的:
- 开发一种结合Nb5+兴奋剂和表面修饰的协同战略.
- 为了稳定丰富的Mn基层氧化物阴极的晶体和接口结构.
主要方法:
- 与高价值Nb5+和表面修饰的协同兴奋剂.
- 使用瑞特维尔德精炼XRD,HRTEM/EDS,现场XRD,DEMS和EIS进行表征.
- 在各种循环条件下进行电化学性能测试.
主要成果:
- 修改后的LLO (M-LLO) 呈现出增强的相位稳定性和抑制的表面相位过渡.
- Nb5+和F-的结合形成了富含氧气空隙的表面层,改善了Li+扩散和界面稳定性.
- 在100个循环 (1C) 后,M-LLO实现了89.7%的容量保留,在300个循环 (3C) 后达到78.4%,电压衰减最小 (3.3mV·循环-1).
结论:
- 核心表面合作工程战略有效地稳定了LLO结构和接口.
- 这种方法导致了对先进的LIBs的坚固,能量密度高的阴极材料.
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