一个用于离子电池的转移稳定的氧氧还氧阴极
Yanfang Wang1,2,3, Cheng Li1, Yingzhi Li1
1Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Angewandte Chemie (International ed. in English)
|February 4, 2025
概括
这项研究介绍了一种稳定,无的阴极材料,用于高能量密度的离子电池,该材料能够同时进行阴离子和阴离子氧化还原. 这种新型的分层氧化物表现出异常的循环稳定性和容量保留,为先进的电池技术铺平了道路.
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:
- 同时利用阴极中的阴离子和阴离子氧化还原是高能量密度离子电池的关键.
- 挑战包括异构体积变化,阴离子迁移和氧气损失,阻碍长期稳定性.
研究的目的:
- 为了证明稳定的阴离子和阳离子氧化还原行为在一个新的,没有的分层氧化物阴极材料.
- 调查负责提高电化学性能和稳定性的结构属性.
主要方法:
- 一种转移稳定的,没有的分层氧化物的合成和表征,Li 0.693[Li 0.153Ni 0.190Mn 0.657]O 2 (LLNMO).
- 电化学测试,包括在特定电流密度下循环性能和容量保留分析.
- 结构分析以将材料特性与电化学稳定性相关联.
主要成果:
- 在50个循环后,LLNMO阴极保留了97.4%的初始容量 (222.4 mAh/g).
- 观察到微不足道的电压衰变,表明了显著的电化学稳定性.
- 具有特定局部几何学的转移性O6型结构 (R-3m对称) 抑制了阴离子迁移和体积变化 (沿c轴<2.3%).
结论:
- 具有独特结构特征的超稳定层氧化物为稳定,高能离子电池阴极提供了有前途的途径.
- 展示的材料克服了与联合阴离子和阴离子氧化还原相关的关键稳定性挑战.
- 这项研究有助于开发下一代超高能离子电池.
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