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一个多功能介层提高可充电电池的水分耐受性

Liu Yang^1,2, Kai Cui³, Lu Chen²

¹College of Materials and Chemistry & Chemical Engineering (College of Lithium Resources and Lithium Battery Industry), Chengdu University of Technology, Chengdu 610059, China.

|July 22, 2025

概括

一个新的基于 sepiolite 的分离器有效地去除水和杂质,提高电池的寿命和安全性. 这种先进的材料提高了循环稳定性和耐热性,即使含水量高.

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
化学工程是化学工程的重要组成部分.

背景情况:

水作为一种主要的杂质,显著降低了电池的性能和安全性.
目前用于减少电解质中的水含量的方法是能源密集的.
稳定电极接口和防止电解质分解对于电池的寿命至关重要.

研究的目的:

开发用于电池分离器的多功能中间层,以减轻水引起的降解.
提高电池的安全性和循环稳定性,使用一种基于 sepiolite 的新材料.
为了研究修改后的分离器的杂质吸收能力和热稳定性.

主要方法:

在商用聚烯分离器 (Sep@PP) 上使用脱水的 sepiolite 作为多功能中间层.
标志着石灰岩中间层的活性部位 (Si-O-Si,Mg-OH2,Mg-OH) 吸收杂质.
在各种条件下测试Sep@PP分离器在LiNi0.5Mn1.5O4 (LNMO)//Li和LiNi0.6Mn0.2Co0.2O2 (NCM622)//Li电池电池的性能.

主要成果:

在Sep@PP分离器有效吸收水 (H2O),化 (HF) 和过渡金属离子.
带有Sep@PP的LNMO//Li电池表现出极好的循环稳定性,在500个循环中保持84.1%的容量,即使使用1200ppm水.
NCM622//Li细胞在55°C时表现出卓越的稳定性,在200个循环后保持72.3%的容量.
石灰岩中间层显著提高了热稳定性,降低了热失控的风险.

结论:

在聚烯分离器上脱水的 sepiolite 是减轻电池中的水危险的有希望的策略.
Sep@PP分离器提高了电池循环稳定性,安全性和对水分的耐受性.
这种方法提供了一种新且有效的方法来提高现代电池技术的性能和可靠性.

关键词:

消除了排放的水分.高温耐受性耐高温耐受性这里是中间层的中间层.电池是电池的使用方式.自然的粘土是天然的.

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