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双极聚合物保护层,用于乙烯碳酸盐电解质中的无树和耐腐蚀的金属阳极

Chenglong Deng^1,2, Binbin Yang¹, Yaohui Liang¹

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

Angewandte Chemie (International ed. in English)

|February 25, 2024

概括

一种新的双极聚合物保护层 (BPPL) 稳定了金属电池 (LMBs),防止了副作用和状物生长. 这提高了电池寿命和性能.

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:

在金属电池 (LMB) 中,金属和乙烯碳酸 (EC) 基电解质之间的接口容易发生副作用反应和状物生长.
这些问题大大限制了LMB的运行寿命和安全性.

研究的目的:

开发一种双极聚合物保护层 (BPPL),防止EC诱导的腐蚀,并促进均的Li+离子传输.
提高LMBs的稳定性和电化学性能.

主要方法:

一种新型的BPPL被合成,其中包含了乙基 (-CH2CH2CN) 和基 (-OH) 极群.
BPPL的特点是能够管理Li+溶解,捕获EC分子,并通过键和离子双极相互作用与离子相互作用.
电化学性能通过使用LiidiyeLi细胞和全细胞 (LiidiyeLiNi0.8Mn0.1Co0.1O2和LiidiyeLiFePO4) 来评估.

主要成果:

BPPL有效地抑制了寄生反应,通过促进Li+溶解和通过键捕获自由EC分子.
蓝基通过离子双极相互作用定TFSI-离子,改善Li+运输和减少度极化,从而抑制Li树突的生长.
二甲电池在10 mA cm-2下经过750多个周期的稳定循环,容量为2 mAh cm-2.
全细胞表现出优越的电化学性能.

结论:

开发的BPPL为提高金属电池的稳定性和性能提供了一个实用的策略.
在BPPL中功能组的独特组合有效地解决了金属电解质接口的关键挑战.

关键词:

双极聚合物保护层是一种双极聚合物保护层.水素键相互作用的相互作用离子双极相互作用离子双极相互作用 +溶解解化方式金属阳极是一种金属阳极.

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