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超薄且机械稳定的LiCoO₂-电解质间相由Mg²⁺参与的电解质启用

Pei Liu¹, Tao Huang², Biwei Xiao³

¹Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.

Small (Weinheim an der Bergstrasse, Germany)

|February 1, 2024

概括

研究人员开发了一种强大的Mg集成阴极-电解质接口 (MCEI),使用二三甲硫) 胺来稳定离子电池 (LIB) 中的氧化 (LCO) 阴极在高电压下.

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
电池技术电池技术

背景情况:

氧化 (LCO) 是离子电池 (LIB) 的关键阴极材料,具有高能量密度.
性能降低和结构不稳定性发生在高电压下,由于电解质反应与脱化LCO.
制定保护阴极-电解质接口的策略对于高压LIBs至关重要.

研究的目的:

创建一个物理和化学稳固的Mg集成阴极电解质接口 (MCEI).
为了提高LiCoO2 (LCO) 阴极材料的循环稳定性和高压性能.
调查二三甲硫) 胺 (Mg[TFSI]2) 作为电解质添加剂的作用.

主要方法:

纳入二三甲硫) 胺 (Mg[TFSI]2) 作为一个电解质添加剂.
在循环过程中形成和描述Mg集成阴极电解质接口 (MCEI).
电化学测试LCO硬币电池和LCO袋式电池的电化学测试.

主要成果:

一个稳定的,2纳米厚的MCEI在长期循环中形成并维持.
在MCEI和LCO网格表面检测到 (Mg).
寄生反应,表面重建,粒子裂和溶解被显著抑制.
LCO阴极表现出长期循环稳定性高达4.5V.
在200个循环后,LCO硬币电池保持了88.13%的容量,而在300个循环后,LCO石墨电池保持了90.4%的容量.

结论:

集成Mg的阴极-电解质接口有效地保护高电压下的LCO阴极.
[TFSI]2作为一种新的电解质添加剂,用于提高LIB性能和稳定性.
这种方法为设计下一代LIB的先进电解质添加剂提供了一个有希望的策略.

关键词:

电极 LiCoO2 的二氧化碳.电解质添加剂的电解质添加剂高能量密度,高能量密度.集成的CEI与相结合.袋子细胞袋子细胞

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