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双离子丰富的聚合物电解质用于高压固态金属电池

Yangqian Zhang¹, Han Liu¹, Fangyan Liu¹

¹Department of Physics, JC STEM Lab of Energy and Materials Physics, City University of Hong Kong, Hong Kong 999077, P. R. China.

|January 10, 2025

概括

研究人员使用酸纳米颗粒和双盐开发了先进的固体聚合物电解质 (SPEs),用于更安全的高压金属电池 (LMB). 这项创新提高了离子导电性和稳定性,为下一代储能铺平了道路.

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
储能储能储能储能储能储能

背景情况:

固体聚合物电解质 (SPEs) 对于安全的金属电池 (LMB) 是至关重要的,但其离子导电率低,电化学稳定性差.
这些局限性阻碍了对先进的储能应用至关重要的高压固态LMB (HVSSLMB) 的开发.

研究的目的:

为HVSSLMBs设计一种具有增强离子导电性和电化学稳定的新型SPE.
为了研究铁电酸 (BTO) 纳米粒子和双盐在聚乙烯化物 (PVDF) 矩阵中的协同效应.

主要方法:

将BTO纳米粒子和双盐纳入基于PVDF的SPEs中.
由此产生的双丰富溶解结构的特征及其对离子传输的影响.
对Li//Li对称电池,LiFePO4//Li电池和NCM811//Li电池进行电化学测试,包括袋式电池性能评估.

主要成果:

在25°C达到高离子导电性 (4.1 × 10−4 S cm−1) 和转移数 (0.70).
在Li//Li对称电池中表现出极好的临界电流密度 (2.4 mA cm−2) 和长期稳定性 (>5000 h).
在LiFePO4//Li和NCM811//Li电池中表现出卓越的循环性能,在4.4V的切断电压下保持高容量.

结论:

BTO NPs和双盐的协同集成有效地创建了一个双离子丰富的溶解结构,大大提高了Li+的运输和稳定性.
开发的SPEs显示出对高性能和安全的HVSSLMB有很大的希望.
这一战略为推进固态电池技术提供了可行的途径.

关键词:

基于PVDF的固体聚合物电解质.盐的溶解和解离是盐的溶解和解离.具有双离子丰富的溶解结构.高压金属电池的使用情况绝缘效应绝缘效应绝缘效应

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