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通过电解质添加剂构建LiF/Li₂CO₃丰富的异构结构电极电解质接口,用于4.5V的循环良好的金属电池

Xinhong Hu¹, Yong Li², Jiandong Liu³

¹School of Chemistry, Tiangong University, Tianjin 300387, China; School of Physics and Electronics, Henan University, Kaifeng 475004, China.

Science bulletin

|May 28, 2023

概括

我们稳定了高电压Li,LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) 电池,使用五四烯 (PFBE) 电解质添加剂. 这提高了接口稳定性,使得持续的循环性能和高能量密度.

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:

高压离子电池 (LIB) 需要稳定的电极-电解质接口,以获得最佳的循环性能.
在高电压 (例如4.5V) 中实现稳定的接口仍然是LIBs的一个重大挑战.
富含的分层阴极如LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) 提供高能量密度,但受到界面不稳定的影响.

研究的目的:

为了增强4.5V Liidiye NCM811 电池的接口稳定性.
提高高压LIB的循环性能和能量密度.
研究电解质添加剂在形成保护界面的作用.

主要方法:

电解质工程使用五四烯 (PFBE) 作为Liidiye NCM811细胞的添加剂.
在NCM811阴极和金属阳极 (LMA) 上形成的电极-电解质界面 (EEI) 的表征.
电化学循环测试,以评估电池的容量保留和稳定性.

主要成果:

PFBE添加剂在两个电极上促进了强大的LiF/Li₂CO₃丰富的异构结构接口的形成.
这些接相有效地抑制了NCM811阴极中不可逆转的相位过渡,微裂和过渡金属溶解.
PFBE还控制了LMA上的树的生长,从而改善了循环稳定性 (在0.5°C的600个循环后保持61.27%).
大型袋式电池 (6.69Ah) 显示出稳定的能量密度约为485Wh kg-1 .

结论:

使用PFBE的电解质工程是一种可行的策略,可以稳定高压Liidiye NCM811电池.
保护性异构介面的形成对于提高电化学性能和寿命至关重要.
这种方法对开发下一代高能量密度LIBs具有前景.

关键词:

电极-电解质相间阶段电解质添加剂是一种电解质添加剂.接口稳定性接口稳定性金属电池的电池是金属的电池.一个袋子细胞.

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