缺乏氧气的TiO是没有氧气的
Yike Lei1, Yingchuan Zhang1, Yongkang Han1
1School of Automotive Studies, Clean Energy Automotive Engineering Center, Tongji University (Jiading Campus) 4800 Cao'an Road Shanghai 201804 P. R. China xiaoqf@tongji.edu.cn.
RSC advances
|June 7, 2023
概括
一种新的TiO2-x介层涂层通过抑制氧气释放,增强稳定性和提高电化学性能来显著改善丰富的Mn基层氧化物 (LMLO) 阴极,从而提高更好的电池的电化学性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 富含的基于Mn的分层氧化物 (LMLO) 阴极由于离子还氧化而具有高容量.
- 在LMLO阴极中不可逆转的离子氧化还原反应导致结构降解和性能差.
- 循环期间的氧气释放是影响LMLO阴极稳定的关键问题.
研究的目的:
- 为了提高LMLO阴极的电化学性能和稳定性.
- 为了减轻与不可逆转的离子氧化还原反应和氧气释放相关的问题.
- 为了研究TiO2-x中间层作为防护涂层的有效性.
主要方法:
- 用单面导电性缺氧TiO2-x介层覆盖商用Celgard分离器.
- 电化学测试,包括容量保留和速率性能测量.
- 操作差电化学质谱 (DEMS) 和X射线光电子谱 (XPS) 进行分析.
主要成果:
- TiO2-x中间层提高了初始库伦比效率,从92.1%提高到95.8%.
- 100个循环后的容量保留率从84.2%增加到91.7%.
- 在5C的速度性能显著提高,从91.3mA hg-1提高到203.9mA hg-1.
- DEMS证实了氧气释放的抑制,而XPS表明副作用减少和改善了阴极电解质间相.
结论:
- 缺乏氧气的TiO2-x中间层有效地抑制了LMLO阴极释放的氧气.
- 间层增强了电化学动力学,稳定性和库伦比效率.
- 这种方法提供了一个有前途的策略,以提高先进电池的LMLO阴极性能.
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