在Ni-丰富的分层阴极中对无同位素谷物生长的动力控制
Shuli Zheng1, Lang Qiu1, Mengke Zhang1
1School of Chemical Engineering, Sichuan University, Chengdu, 610065, P.R. China.
Angewandte Chemie (International ed. in English)
|September 17, 2025
概括
在分层的氧化物阴极中使用元素兴奋剂可以控制粒子形态和电化学稳定性. 像Mo6+这样的高价值剂显著阻碍了谷物生长,通过固定谷物界限来增强电池循环稳定性.
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Ni的多层氧化物阴极中的粒子形态对于电化学稳定性至关重要.
- 在高温化过程中异型粒的生长会影响阴极性能.
- 剂对谷物生长动力学的效应尚不清楚.
研究的目的:
- 系统地研究具有不同价值的兴奋剂对异型粒体生长动力学的影响.
- 阐明使用剂影响谷物边界迁移和粗的基本机制.
- 为了将剂诱导的微观结构变化与电化学性能相关联.
主要方法:
- 高温化工艺与系统的兴奋剂.
- 沿着特定的晶体学方向分析异型粒体生长动力学 ([003], [104], [110]).
- 确定谷物生长指数 (n) 以了解扩散机制.
主要成果:
- 谷物增长率最初有利于 [104] 和 [110] 方向,然后转向 [003] 方向.
- 低价值兴奋剂 (Mg2+,Al3+) 的结果为n ≈2,表明谷物边界扩散控制.
- 增加的兴奋剂价值,特别是Mo6+,显著增加了沿着[003]的指数n到4.5.5.
- 在谷物边界的Mo6+分离导致了强烈的固定效应,阻碍了迁移和粗.
结论:
- 补充剂的价值是控制分层氧化物阴极中异性粒度增长的关键因素.
- 高价值补充剂,特别是Mo6+有效地通过谷物边界钉定来抑制谷物粗.
- 这种受控的微观结构进化增强了富含Ni的多层氧化物阴极的循环稳定性.
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