紧的离子对聚合物主导的电解质使高性能低温离子电池成为可能
Feng Su1, Yiting Lin2, Xin Dou1
1Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Angewandte Chemie (International ed. in English)
|August 4, 2025
概括
研究人员为离子电池 (LIB) 开发了一种新的电解质策略,可以在零下温度下提高性能. 这项创新改善了离子传输,并使在寒冷条件下能够稳定循环.
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:
- 离子电池 (LIB) 在零度以下的温度下面临运行挑战,原因是电解质离子运输和电荷转移偏振不佳.
- 在低温下降级的性能限制了LIBs在寒冷环境中的应用.
研究的目的:
- 开发一种新的电解质策略,以提高离子电池在零度以下温度下的性能.
- 改进离子转移,减少电解质中的溶解能量障碍.
主要方法:
- 设计的溶解结构以紧的离子对聚合物 (CIPA) 为主,使用弱溶剂相互作用.
- 研究了离子衍生的固体电解质接口的形成.
- 在全电池中使用天然石墨和LiNi0.8Co0.1Mn0.1 (NCM811) 电极评估了电化学性能.
主要成果:
- 取得了显著改善的离子转移数和降低的溶解能量障碍.
- 证明了强大的离子衍生的固体电解质接口的形成,使得在低温下能够快速输送离子.
- 在 -20°C (0.5°C) 时,NCM811所谓的原石墨全细胞保持了84.7%的容量,并且在 -40°C的200个周期中表现出稳定的循环.
结论:
- 拟议的电解质策略使高性能离子电池能够在极低的温度下使用.
- 这项工作提供了一种创新的方法来克服LIBs中的温度限制.
- 开发的电解质适用于需要在寒冷天气中可靠运行的实际应用.
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