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抑制电场诱导的阴极盐结晶,用于稳定的离子电池
Zhejian Yi1, Chenxi Luo1, Hainan Wang1
1Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, School of Materials Science and Engineering, Huaqiao University, Xiamen, China.
Advanced materials (Deerfield Beach, Fla.)
|December 31, 2025
概括
水性离子电池由于盐结晶而受损. 添加硫电解质添加剂可以防止这种情况,使电池在室温和零下条件下保持稳定的性能.
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:
- 水性离子电池 (AZIB) 提供可持续的储能,但面临容量衰减的挑战,特别是在低温下.
- 包括盐结晶在内的界面不稳定性是AZIB降解的主要原因,阻碍了它们的实际应用.
研究的目的:
- 在AZIB中识别和阐明电场诱导的灾难性界面盐结晶 (CISC) 的机制.
- 开发一种电解质工程策略,以抑制CISC并增强AZIB的稳定性,特别是在零下条件下.
主要方法:
- 通过机械学研究和分子动力学模拟,研究了界面失效路径.
- 采用实验观察来验证模拟结果,并评估硫 (TS) 作为电解质添加剂的影响.
- 通过室温和-20°C的循环测试来评估电池性能.
主要成果:
- 揭露CISC,由电双层中的溶剂耗尽和离子丰富驱动,作为一个关键的降解途径.
- 证明硫烯有效地破坏了界面离子排序,并提高了结晶屏障,抑制了CISC.
- 在V2O5中实现了显著的稳定性,同时还保留了378.9 mAh g-1的电池,在室温下经过300个周期,在-20°C下经过超过20,000个周期后保持了378.9 mAh g-1.
结论:
- 接口盐结晶是限制AZIB性能的关键失效机制,特别是在低温下.
- 使用硫烯的电解质工程提供了一种可行的分子水平策略,以提高AZIB的稳定性和周期寿命.
- 这些发现为开发强大的AZIB为各种能源存储应用铺平了道路.
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