全循环溶剂电解质设计使超低温和快速充电的离子电池成为可能
Zongbin Luo1, Linyu Hu2, Yong Ye1
1College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan, P. R. China.
Angewandte Chemie (International ed. in English)
|March 11, 2026
概括
这项研究引入了一种新型,低成本的电解质,用于仅使用循环溶剂的离子电池 (SIB). 新的电解质能够在极低温度下实现超快充电和稳定的运行,克服了传统SIB电解质的关键局限性.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 传统的离子电池 (SIB) 电解质面临着溶剂结晶和在低温下缓慢的离子传输等挑战.
- 当前的电解质通常使用混合循环和线性碳酸盐,限制了SIB在寒冷条件下的性能.
研究的目的:
- 为SIBs开发一种低成本的全循环溶剂电解质.
- 增强Na+运输和抑制结晶,以提高低温性能和快速充电.
主要方法:
- 通过引入循环乙烯 (THF,CPME) 进入循环碳酸盐 (PC,EC),系统地重建 Na+ 溶解结构.
- 研究高极性和低极性循环乙烯之间的竞争协调,以创建富含离子的溶解环境.
- 评估电解质特性,包括离子导电性,点和界面稳定性.
主要成果:
- 达到超低点 (<-130°C) 和高离子导电性.
- 经过证明的超快充 (89.9 mAh g-1在50°C) 和优秀的低温性能 (57%的容量保留在-70°C).
- 呈现出超长周期稳定性 (>10000个周期) 和在26700个圆柱形电池中验证的实际适用性.
结论:
- 开发的全循环溶剂电解质克服了SIBs的关键低温限制.
- 该战略为低成本,快速充电和超低温SIB提供了一种通用方法.
- 电解质设计在各种滥用条件下确保了高安全性.
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