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功能性硫酸盐添加剂衍生界面层,增强基于PEO的聚合物电解质的电化学稳定性

Sun Ho Kim¹, Namjun Park², Won Bo Lee²

¹Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)

|December 28, 2023

概括

这项研究引入了用于高压金属电池的新聚合物电解质. 一种新型的硫酸盐添加剂增强了稳定性,防止了降解,并提高了性能,以实现更安全的下一代能源存储.

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
聚合物科学聚合物科学

背景情况:

固态电池提供高能量密度和安全性,聚合物凝电解质显示出承诺.
在高压应用中,基于聚 (乙烯氧化物) (PEO) 的电解质面临电化学稳定性问题.
稳定的接口对于高性能金属电池至关重要.

研究的目的:

为高压金属电池开发一种稳定的聚合物电解质.
为了解决基于PEO的电解质的电化学不稳定性.
为了改善电极和聚合物电解质之间的接口特性.

主要方法:

将一个功能硫酸盐添加剂 (1,3-propanediolcyclic sulfate,PCS) 纳入热交联的基于PEO的聚合物网络凝电解质 (SA-TGPE).
研究电极上稳定的界面层的形成.
对高压金属电池的电化学稳定性和性能进行评估.

主要成果:

PCS添加剂形成稳定的接口层,增强电化学稳定性.
在阴极上以PEO为基础的聚合物矩阵的分解得到了缓解.
富含Ni的NCM阴极上的副作用和阳极上的树状物生长受到缓解.
改进的接口特性导致了电池性能的提高.

结论:

含硫酸盐添加剂的热交联凝型聚合物电解质 (SA-TGPE) 有效地解决了基于PEO的电解质的电化学不稳定性.
使用电解质添加剂进行界面修改是高压金属电池的可行策略.
这种方法为商业化更安全,更高性能固态电池提供了一条道路.

关键词:

电化学稳定性电化学稳定性凝类型的聚合物电解质聚合物电解质高压阴极的高压电极.界面修改界面修改界面修改金属阳极是一种金属阳极.作为硫酸盐添加剂的添加剂

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