延展阻抗连贯矿相稳定 Ni 丰富的阴极
Liguang Wang1,2,3, Tongchao Liu4, Tianpin Wu5,6
1College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.
Nature
|November 3, 2022
概括
研究人员开发了一种稳定高能离子电池阴极的新方法. 通过添加矿相, 它们减少了结构应变, 提高了电池寿命和性能,
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 富含的层氧化物 (LiNixCoyMn1-x-yO2) 为离子电池提供高能量密度.
- 结构不稳定性和衰变发生在 (de) 间隔过程中,尤其是在高电压 (> 4.5 V) 时.
- 现有的方法难以本质上减轻连续的格子应变积累.
研究的目的:
- 为高能阴极材料开发一种内在阻延方法.
- 增强富含的多层氧化物的结构稳定性和电化学循环.
- 为了使先进的离子电池能够开发耐用,高能量密度的阴极.
主要方法:
- 在分层氧化物结构中引入连贯的矿阶段.
- 使用矿阶段作为"钉"来固定层状结构.
- 在电化学循环过程中对格子应变和结构完整性的描述.
主要成果:
- 通过固定效应显著减轻结构变化.
- 与常规材料相比,每次循环将近70%的格子应变显著减少.
- 增强形态完整性和显著改善电池循环.
结论:
- 矿""方法有效地减轻了富含Ni的阴极中的晶格应变.
- 这种抗应变策略显著提高了阴极耐用性和电池性能.
- 该方法为设计高能长寿命电池材料的格子工程提供了新的视角.
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