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在内赫尔姆霍尔茨平面的阳离子吸附指导着阴极电解质相间形成

Yuchen Ji¹, Yuxiang Huang¹, Zihang Dong²

¹School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.

Angewandte Chemie (International ed. in English)

|February 26, 2025

概括

稳定的阴极电解质介面 (CEI) 对于高压离子电池至关重要. 这项研究揭示了LiCoO2上的离子吸附如何形成一个紧的CEI,确保了出色的4.7V循环稳定性.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
电池技术电池技术

背景情况:

高压离子电池需要一个稳定的阴极-电解质间相 (CEI).
CEI的形成是一个复杂的过程,涉及不可逆转的反应,在原子层面不太了解.
了解CEI形成是提高电池性能和寿命的关键.

研究的目的:

为了阐明 LiCoO2 阴极上的阴极电解质介面 (CEI) 的形成机制.
在CEI形成过程中将界面结构与界面化学相关联.
为了确定控制CEI形成的关键因素,用于先进的电解质设计.

主要方法:

采用了现场/操作界面特征技术.
石英晶体微平衡与散射监测 (QCM-D) 用于研究吸附.
电化学分析证实了CEI对电池性能的影响.

主要成果:

二氧酸盐 (DFOB-) 离子优先吸附于LiCoO2,取代碳酸盐溶剂.
这种离子驱动的吸附导致一个紧的CEI,在高电压下抑制溶剂分解.
带有密集CEI的LiCoO2阴极保持了结构完整性,并在4.7V时表现出极好的循环稳定性.

结论:

阳离子吸附行为对于形成稳定和紧的CEI至关重要.
这些发现为CEI形成提供了原子学的见解,为高压电池的电解质设计提供了指导.
这项研究加速了下一代离子电池的开发,提高了稳定性和性能.

关键词:

阴极电解质相间阶段高压电池电池的高压电池是什么在现场界面的特征描述.内海尔姆霍尔茨平面是内海尔姆霍尔茨平面.接口吸附吸附方式

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