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凝聚合物电解质通过生物接口设计使低温和高速离子电池成为可能

Xiaofei Liu¹, Dong Wang¹, Zibo Zhang²

¹Key Laboratory of Automobile Materials of MOE, School of Materials Science and Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun, 130013, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|August 5, 2024

概括

研究人员开发了一种新的凝聚合物电解质 (GPE),具有3D溶解界面. 这一突破通过改善离子传输和SEI稳定性来提高快速充电和低温电池的碳阳极性能.

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
聚合物科学聚合物科学

背景情况:

传统的以乙烯碳酸盐 (EC) 为基础的电解质在快充和低温条件下限制了碳 (Si-C) 阳极的性能.
缓慢的Li+迁移动力学和不稳定的固体电解质介相 (SEI) 是关键的挑战.
开发先进的电解质对于下一代能源储存至关重要.

研究的目的:

为Si-C阳极设计一个稳定的SEI,具有3D溶解接口.
加速+溶解和迁移在界面和SEI内部.
在苛刻的条件下提高Si-C阳极的性能.

主要方法:

在位环开聚合的1,3-二氧化 (DOL) 形成聚1,3-二氧化 (PDOL).
理论模拟和GPE结构和属性的实验验证.
制造和测试带有新型GPE的Si-C阳极在袋子里装满细胞.

主要成果:

基于PDOL的GPE表现出3D溶解区域,改善Li+溶解,并产生高离子导电率 (5.73mS cm-1).
由阴离子衍生的稳定SEI形成,增强Li+运输.
在室温和-40°C下,Si-C阳极表现出色的速率性能.
在5C/5C的500个循环后,袋式充满电池达到97.42 mAh g-1.

结论:

创新设计的3D脱盐接口和SEI代表了重大突破.
这种方法克服了用于Si-C阳极的EC电解质的局限性.
开发的GPE对开发高性能快充和低温电池充满希望.

关键词:

3D解溶接口的接口是 3D 解溶.快速充电快速充电快速充电凝聚合物的电解质凝.低温低温的低温是一个问题.碳阳极是一种碳阳极.

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