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Updated: Jun 12, 2025

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同时调制阴极/阳极和电解质接口通过酸添加剂用于高能量密度金属电池

Ziye Wang¹, Yingshuai Wang¹, Yuhang Xin¹

¹School of Materials Science & Engineering, Beijing Institute of Technology Beijing 100081 P.R. China gaohc@bit.edu.cn.

Chemical science

|September 26, 2024

概括

在电解质中添加苏奇尼尼特 (SN) 增强了富含的分层氧化物电池的稳定性. 这种电解质工程改善了阴极和阳极接口,提高了长期的性能和容量保留.

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:

富含的分层氧化物,如LiNi0.8Co0.1Mn0.1O2 (NCM811),对于高能离子电池至关重要.
这些电池的长期循环稳定性受到电极-电解质接口的限制.
确保接口稳定对于商业可行性至关重要.

研究的目的:

为了提高NCM811电池的长期循环稳定性.
为了设计一个更稳定的阴极-电解质接口,使用succinonitrile (SN) 添加剂.
为了研究阴极和金属阳极接口的同时稳定.

主要方法:

电解质工程是通过向电解质添加苏奇尼尼特 (SN) 来进行的.
阴极-电解质接口结构和性能的表征.
用SN修饰的电解质对NCM811//Li细胞进行电化学测试.

主要成果:

与SN形成了一个更密集,更薄,更稳定的阴极-电解质接口.
SN添加剂减少了循环过程中的压力,应变和不可逆转的相位过渡.
此外,SN还稳定了金属阳极-电解质接口.
具有1.0重量%SN的电池在1C的250个循环后,容量保留增加了32.8%.

结论:

苏奇尼尼特 (SN) 是一种有效的电解质添加剂,用于稳定富含的阴极和金属阳极.
使用SN的电解质工程为具有增长周期寿命的高能量密度金属电池提供了一条途径.
这种方法为先进电池系统的同时接口稳定提供了一个新的策略.

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