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构建聚合物分子来调节电极/电解质接口以提高金属电池的性能

Hui Chen¹, Yu-Xiang Xie¹, Long-Ji Dong¹

¹College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, China.

|February 26, 2024

概括

一种新的聚合物双功能电解质添加剂PMANHF通过形成稳定的接口来提高离子电池的性能. 这改善了金属阳极沉积和NCM811阴极稳定性,使周期寿命更长.

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
聚合物化学聚合物化学

背景情况:

离子电池对于电子产品和车辆至关重要,但需要提高能量密度,安全性和循环寿命.
现有的单功能组电解质添加剂具有实际限制.
先进的电解质添加剂对于下一代金属电池至关重要.

研究的目的:

为了合成和评估一种新的三元聚合物双功能电解质添加剂,PMANHF.
为了研究PMANHF对Li金属阳极固体电解质介相 (SEI) 层形成的影响.
评估PMANHF在Li/NCM811电池中的性能提升.

主要方法:

使用自由基聚合来合成PMANHF共聚合物.
对Li/Li和Li/NCM811细胞进行了电化学表征,包括循环测试.
用表面分析技术研究形成的接口层.

主要成果:

在金属阳极上,PMANHF优先降解,形成一个带有密集沉积的均且稳定的SEI层.
在NCM811阴极接口上形成一个富含LiF和Li3N的薄膜,抑制侧面反应.
/电池在1.0 mA cm-2下实现了1000个循环,而/NCM811电池稳定了200个循环,容量保留了89.93%.

结论:

合成的PMANHF有效地提高了金属电池的稳定性和周期寿命.
作为高性能电池的双功能电解质添加剂,PMANHF显示出显著的潜力.
这项研究为设计用于金属电池应用的先进添加剂提供了宝贵的见解.

关键词:

金属电池的电池是金属的电池.电极/电解质接口接口电解质添加剂是一种电解质添加剂.激进的聚合方式.

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