聚合物主导的稀释电解质与耐低温离子导通道,用于高度可逆的Na/剥离
Bingcheng Ge1, Jiaojiao Deng2, Zhijie Wang3
1Department of Mechanical Engineering and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hong Kong, 999077, China.
Advanced materials (Deerfield Beach, Fla.)
|August 13, 2024
概括
研究人员为无阳极金属电池 (AFSMB) 开发了一种新的电解质,可在低温下实现高性能. 这一突破提高了电池的导电性和稳定性,用于寒冷的气候应用.
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:
- 开发适用于寒冷气候的可充电电池需要在0°C以下提供高功率.
- 无阳极金属电池 (AFSMB) 由于Na+特性,具有低温 (LT) 性能的潜力,但面临电解质导电性和固体电解质间相 (SEI) 稳定性的挑战.
- 现有的电解质与减少的离子导电性和不稳定的SEI在LT的形成作斗争.
研究的目的:
- 为AFSMB设计一种超越低温限制的新型电解质.
- 为了实现高离子导电性和在低至-40°C的温度下稳定的SEI.
- 为了证明AFSMB在寒冷环境中的实际可行性.
主要方法:
- 一种基于2-甲基四氨基的稀释电解质的配方.
- 对离子协调溶解结构和在-40°C的离子导电性的研究.
- 分析固体电解质间相 (SEI) 组成和特性.
- 在零度以下的温度下测试AFSMB的性能,包括循环稳定性和容量保留.
主要成果:
- 设计的电解质在-40°C时具有3.58mS cm-1的离子导电性.
- 电解质促进了耐LT的Na+跳跃通道的形成.
- 形成了一个稳定的无机-有机双层SEI,具有高Na+流动性和机械强度.
- 创纪录的库伦比克效率超过99.9%,在-40°C时实现.
- AFSMB显示300个循环,容量保持80%,0.5Ah袋式电池在 -25°C下180个循环中保持了85%的容量.
结论:
- 开发的电解质使有效的离子导电和在超低温度下稳定的可逆性成为可能.
- 这项工作为制备高性能冷气候电池的电解质提供了一个有希望的策略.
- 这些发现为AFSMB在极端温度条件下的实际应用铺平了道路.
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