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工程表面氧气空隙缓冲器实现超高压LiCoO₂

Muhammad Imran¹, Zhongsheng Dai¹, Fiaz Hussain²

¹Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

|August 7, 2025

概括

研究人员使用兰酸盐 (La2Mo2O9) 稳定了氧化物 (LiCoO2) 表面,以实现更高电压的离子电池. 这种表面工程可以防止降解,提高电池性能和寿命.

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:

高能离子电池 (LIB) 需要更高的操作电压 (≥4.6V) 来增加能量密度.
在LiCoO2 (LCO) 中升高的电压会导致晶格氧释放,导致表面降解和因电解质反应而增加的界面电阻.

研究的目的:

为了设计LiCoO2的表面,以承受更高的操作电压.
为了减轻表面退化,并提高基于LCO的LIBs的电化学性能.

主要方法:

通过调节回火温度,在LCO表面引入了带有41%氧空缺的兰酸 (La2Mo2O9,LMO).
使用La和Mo离子作为"氧",通过强大的La-O和Mo-O键稳定LCO表面氧.
利用LMO的氧气空缺,在现场从散装LCO中捕获释放的氧气.

主要成果:

在高工作电压下成功稳定了LCO表面结构.
电解质和LCO材料之间的缓解界面副作用.
在4.6V和1C的100个循环后,在半电池中实现了86.2%的容量保留.
经过450个循环后,在一个完整的细胞中证明了90%的容量保留.

结论:

使用LMO的表面工程通过定氧气并捕获释放的氧气,有效地稳定LCO在高电压下.
这种方法显著减轻了结构性降解,并提高了基于LCO的LIB的电化学性能和周期寿命.

关键词:

电极 LiCoO2 的二氧化碳.氧气 anchor 氧气是指一个氧气.捕获氧气捕获氧气的方法有空缺的氧气位.表面工程是什么?表面工程是什么?

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