一个没有Na的表面可以"三合一"地提高离子电池阴极的结构,接口和空气稳定性
Guojie Sun1,2, Youchen Hao1,2, Lihua Feng1,2
1School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Small (Weinheim an der Bergstrasse, Germany)
|August 13, 2024
概括
离子电池阴极材料的表面重建提高了稳定性. 在NMF111上,无Na的表面层可以提高容量保留和防潮性能,这对于实际的离子电池应用至关重要.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- O3型层氧化物是离子电池的有希望的阴极材料.
- 挑战包括相位过渡,寄生反应和由于活性Na+离子的湿度敏感性.
研究的目的:
- 为了提高NaNi1 / 3Mn1 / 3Fe1 / 3O2 (NMF111) 阴极材料的循环性和稳定性.
- 为应对与离子电池中的O3型层氧化物相关的挑战.
主要方法:
- 通过浸出和重建来修改NMF111的表面,以创建一个无Na的层.
- 电化学测试用于评估容量保留和循环性能.
- 暴露在潮湿的空气中以评估湿度稳定性.
主要成果:
- 经过修改的NMF111显示,在1C的400个循环后,容量保持率从58.3%提高到89.6%.
- 无的表面层改善了结构性降解和固体电解质接口 (SEI) 的过度生长.
- 重建的表面防止了H+/Na+交换,增强了可逆性,并在潮湿条件下减少了极化.
结论:
- 表面重建是提高O3型层氧化物全面循环能力的有效策略.
- 无的表面层提高了结构完整性和电化学性能,特别是在潮湿的条件下.
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