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一种局部与溶剂结合的聚合物电解质,用于长寿命的金属电池

Yanfei Zhu¹, Zhoujie Lao¹, Mengtian Zhang¹

¹Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Shenzhen, 518055, PR China.

Nature communications

|May 9, 2024

概括

这项研究引入了一种新的复合聚合物电解质,使用霍夫曼-DMF协调复合物来提高离子电池的性能. 新材料通过稳定电解质接口来增强离子导电性和循环寿命.

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:

固体聚合物电解质为更安全的电池提供了潜力,但往往遭受低离子导电性.
像N,N-二甲基形式胺 (DMF) 这样的可塑剂增强导电性,但会导致固态电池的降解和不稳定接口,限制循环寿命.

研究的目的:

为固态电池开发一种稳定且高导电性的复合聚合物电解质.
通过防止DMF降解,克服传统的DMF塑化电解质的局限性.

主要方法:

复合聚合物电解质的制造,其中包含霍夫曼-DMF协调复合物.
在Hofmann框架上将DMF设计为绑定的连接体,以创建本地DMF丰富的接口.
用硫化聚烯烯酸铁阴极对立的酸细胞和全细胞的离子导电性和电化学性能的表征.

主要成果:

在室温下达到6.5 × 10−4 S cm−1 的高离子导电性.
在0.1 mA cm−2的LidoseLi对称细胞中经过6000多小时的稳定循环.
全细胞表现出一个延长的循环寿命1000个循环在1°C与硫化多烯二阴极.

结论:

合理设计的霍夫曼-DMF协调复合物有效地稳定了电解质接口,并减轻了DMF降解.
复合聚合物电解质表现出优异的离子导电性和长期循环稳定性,为实际的聚合物固态电池铺平了道路.

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