氧气二元化作为批量LiNiO2中的缺陷驱动过程
Alexander G Squires1,2, Lavan Ganeshkumar2,3, Christopher N Savory1
1School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.
ACS energy letters
|August 15, 2024
概括
在氧化正极材料中氧气二元化是可能的,特别是在高电荷状态下. 这些材料中的缺陷可以启动氧气二分化,从而导致散装降解.
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
- 固态化学 固态化学
背景情况:
- 富含的氧化 (LiNiO2) 是离子电池的一个有前途的阴极材料.
- 这些材料的高电荷状态会导致氧气释放和降解.
- 关于 LiNiO2.2 大量的分子氧的形成存在相互矛盾的报道.
研究的目的:
- 调查 LiNiO2 阴极材料中大部分氧气二元化的潜力.
- 了解高电荷状态在氧物种形成中的作用.
- 为了阐明在富含的阴极中大量降解背后的机制.
主要方法:
- 使用了氧化还原产品结构搜索方法.
- 灵感来自于最近在点缺陷结构预测方面的进展.
- 聚焦在x = 1 (完全脱状态) 的脱化Li1-xNiO2上.
主要成果:
- 脱化LiNiO2 (x = 1) 呈现出对分子氧分解的动力稳定性.
- 材料中的点缺陷可以作为氧气二分化核化场所.
- 缺陷化学在启动批量降解途径方面发挥着至关重要的作用.
结论:
- 氧气二元化可以发生在LiNiO2的大部分,由缺陷促进.
- 这些发现协调了以前关于富含的阴极中氧气形成的相互矛盾的观察结果.
- 了解缺陷化学是减轻批量降解和提高正极稳定性的关键.
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