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微-电解质,使热关闭向安全的金属电池

Xiangfei Ren¹, Xinru Zhang¹, Yukun Cao¹

¹State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, PR China.

Journal of colloid and interface science

|November 12, 2025

概括

这项研究介绍了金属电池的智能电解质,具有热关闭功能. 该系统通过在高温下凝固电解质来防止热失控,从而提高了电池的安全性.

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
电池技术电池技术

背景情况:

高能量密度金属电池由于热失控而面临安全挑战.
开发更安全的电池电解质对于推进储能技术至关重要.

研究的目的:

为金属电池开发一个智能电解质系统,具有温度响应的热关闭功能.
为了减轻热失控的风险,并提高电池的安全性和性能.

主要方法:

在电解质中加入微封装的五乙四烯酸 (PETEA).
PETEA和以乙烯终结的三甲基三烯酸盐 (ETPTA) 之间的协同相互作用,用于现场聚合.
在温度升高时触发液态到固态相变,以阻止离子运输.

主要成果:

热失控发作温度在1Ah袋细胞中从140°C增加到234°C.
燃烧测试显示,高峰温度 (67.7%) 和总热释放 (63.6%) 的显著降低.
形成一个富含Li3N的固体电解质间相 (SEI) 改善了Li+运输和抑制了树突的生长,LiFePO4//Li细胞在300个循环后保持了92.1%的容量.

结论:

智能电解质系统通过诱导快速相位过渡,有效提高了热安全性.
开发的系统为制造高安全性,高能量密度的金属电池提供了一个有前途的战略.
这种方法有助于推进更安全的储能解决方案.

关键词:

阻燃剂是一种阻燃剂.金属电池的电池是金属的电池.微囊微囊是一种微囊.分离器分离器分离器分离器热安全热安全热安全热关闭热关闭

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