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破碎聚合状态,以实现金属电池的低温快速充电

Xiaoyu Guo¹, Shengtao Xu¹, Rong Gu¹

¹Shanghai Key Laboratory of Materials Protection and Advanced Materials Electric Power, Shanghai University of Electric Power, Shanghai, 200090, P. R. China.

Angewandte Chemie (International ed. in English)

|January 31, 2025

概括

研究人员通过改变电解质溶解结构来提高低温金属电池的性能. 这项创新增强了离子导电性,使得在极寒条件下稳定的循环运行成为先进的储能系统.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

金属电池 (LMB) 的低温性能受到电解质中电离电导率不足和高溶解能量障碍的阻碍.
弱溶解电解质 (WSEs) 呈现有限的盐分离,导致丰富的聚合物 (AGGs),增加粘度,阻碍低温 (≤-20°C) 的离子流动性.

研究的目的:

为了克服WSEs在低温LMB应用中的局限性.
通过改变电解质溶解结构,实现弱+溶剂相互作用和高效的离子迁移动力学之间的平衡.

主要方法:

调整了WSEs的整体溶解能力,将溶解结构从丰富的离子聚合物 (AGG) 转变为接触离子对 (CIP).
研究了溶解结构转换对离子导电性和离子迁移动学的影响.
在低温下使用底液LiFePO4 (LFP) 电池和实用的LFP袋式电池评估电池性能.

主要成果:

实现了WSE溶解结构从AGG转变为CIP,从而使离子导电率增加了十倍.
在LFP电池中,在5C时显示超过1400个周期,容量保留86.9%.
一个1.2Ah的LFP袋式电池在-40°C循环时保留了其25°C容量的69%.

结论:

在WSEs中提出的溶解结构转换策略有效地提高了低温电池的性能.
由CIP主导的电解质为开发用于低温储能应用的先进电解质提供了一个有前途的途径.
这项工作为克服用于寒冷环境的高性能金属电池开发的关键挑战提供了一种新的方法.

关键词:

金属电池金属电池溶解结构是一个溶解结构.在超低温的超低温.弱溶解电解质的电解质的溶解能力较低.

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