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高压层氧化物阴极的表面电化学-机械相互作用诱导的固体溶液相位过渡

Zibin Liang¹, Chuying Ouyang^1,2, Longze Li¹

¹21C LAB, Contemporary Amperex Technology Co., Limited, Ningde, Fujian 352000, China.

|April 22, 2025

概括

层氧化物 (SLO) 阴极上的一种新型Mn梯度表面层可以防止有害的相位过渡. 这一战略提高了高压离子电池的电化学性能和稳定性.

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
储能储能储能储能储能储能

背景情况:

层氧化物 (SLO) 阴极对于高压离子电池至关重要.
阶段过渡,特别是OP间生长阶段,通过导致缓慢的动力学,应变和反应性来限制SLO性能.
像大规模兴奋剂这样的现有策略在控制这些阶段过渡方面存在局限性.

研究的目的:

调查Mn梯度表面层对SLO阴极相位过渡行为的影响.
了解这种表面修饰如何影响高电压下的电化学性能.
探索一种提高离子电池阴极稳定性和能量密度的新策略.

主要方法:

用Mn梯度的表面层制造SLO阴极.
在现场使用X射线衍射 (XRD) 和冷扫描传输电子显微镜 (Cryo-STEM) 来分析相位过渡.
在高电压下 (高达4.3V) 进行电化学测试,以评估性能指标.

主要成果:

梯度表面层成功地调整了从OP杂交成长到无应力O3固体溶液的大量相位过渡.
富含Mn的表面表现出异步的Na提取,抑制了OP生长间核和生长.
使用Mn梯度表面的SLO阴极显著提高了能量密度,速率能力,效率和循环稳定性.

结论:

一个Mn梯度的表面层是控制SLO阴极相位过渡的有效策略.
这种表面工程方法克服了与高压应用的散装兴奋剂相关的局限性.
增强的O3固体溶液相变行为导致优越的电化学性能,为先进的离子电池铺平了道路.

关键词:

阴极是天主体,它们是天主体.电化学机械相互作用的高压电机.阶段变化转换阶段变化有层层的氧化物.离子电池离子电池

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