局部化高度电解质与半溶解的六化异甲基乙烯稀释剂用于广泛温度范围的金属电池
Chuan Wang1, Kai Wan2, Pengfei Liu1
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, P.R. China.
Angewandte Chemie (International ed. in English)
|April 23, 2025
概括
这项研究引入了金属电池的新电解质,在极寒和极热条件下可靠工作. 创新的设计提高了电池的性能和寿命在广泛的温度范围内.
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:
- 金属电池 (LMB) 中的传统电解质在高温下面部降解和在低温下缓慢的离子动力学面临挑战.
- 这些局限性阻碍了LMB在各种环境条件下的实际应用.
研究的目的:
- 为金属电池开发一种新的电解质系统,以确保在广泛的温度范围内保持稳定和高效的运行.
- 通过优化离子运输和界面稳定性来解决传统电解质的局限性.
主要方法:
- 在局部高度电解质 (LHCE) 中引入半溶解的六化烯基甲基乙烯 (HFME) 稀释剂.
- 在HFME中协调性群体,以维持低温下+跳跃网络.
- 利用恐惧组诱导的空间封闭来促进阴离子聚合物 (AGG) 以优化Li+溶解和稳定的固体电解质介相 (SEI) 形成.
主要成果:
- 稀释剂协调的LHCEs (DCL) 电解质使LiLiFePO4 (LFP) 电池能够在-20°C下达到125.4 mA hg-1的电容,在150个循环后保持92.2%的容量.
- 在65°C,基于DCL的LFP电池在60个周期中保持了91.3%的容量保留.
- 使用DCL的1000 mA h Liidiye NCM811袋式电池表现出卓越的循环稳定性,在75个循环后保持91.6%的容量.
结论:
- 开发的DCL电解质具有空间调节的溶解结构,有效地克服了传统LMB电解质的温度依赖的局限性.
- 这项工作建立了用于制造适用于广泛温度范围金属电池的电解质的基本设计原则.
- 创新的溶剂化学方法显著提高了金属电池的性能和耐用性.
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