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在高压超高Ni阴极中抗位缺陷和合阳离子还原体的动态演变

Kang Wu^1,2,3, Peilin Ran^1,2, Wen Yin^4,5

¹Songshan Lake Materials Laboratory, Dongguan, 523808, China.

Angewandte Chemie (International ed. in English)

|July 26, 2024

概括

超高阴极显示出先进的离子电池的前景. 这项研究揭示了Li-Ni抗现场缺陷和Ni迁移如何影响性能,为稳定,高压电池循环提供了洞察力.

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:

超高 (Ni≥0.9) 阴极 (LiNi_xCo_yMn_1-x-yO₂) 为离子电池提供了增强的能量密度和成本效益.
然而,在高压循环过程中,Li-Ni抗现场缺陷及其动态演变阻碍了性能.
阳离子氧化还原是限制超高Ni阴极发展的另一个关键挑战.

研究的目的:

量化超高Ni阴极中Li-Ni抗体缺陷的动态演变.
为了研究Li-Ni抗体缺陷和阳离子氧化还原之间的合关系.
在这些先进的电池材料中建立稳定的高压循环策略.

主要方法:

运行中子衍射被用来监测循环过程中的缺陷演变.
进行了电化学循环,以评估电池性能.
进行了结构分析,以将缺陷动态与电化学稳定性相关联.

主要成果:

该研究量化了Li-Ni抗体缺陷的动态演变.
在高电压下,确定了Ni迁移,不稳定的氧格子和阳离子氧化还原之间的合.
尽量减少Li-Ni抗体缺陷和控制Ni迁移被证明是稳定循环的必要条件.

结论:

尽量减少Li-Ni抗体缺陷和控制Ni迁移对于超高Ni阴极的稳定高压循环至关重要.
减少缺陷演变有效抑制阳离子氧化还原,增强在4.5V的循环稳定性.
这项研究为开发下一代高能量密度离子电池提供了途径.

关键词:

阳离子氧化还原剂 (ANION Redox) 是一种在网站前有缺陷.离子电池离子电池通过中子衍射进行微分.超高Ni 阴极超高Ni 阴极

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