晶体方面工程化的离子调节使金属电池的快充稳定性成为可能
Chunli Liu1, Weiping Li1, Zheng Wang2
1School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Engineering Research Center of Energy Storage Material and Chemistry, Universities of Shaanxi Province, Xi'an Jiaotong University, Xi'an, 710049, China.
Angewandte Chemie (International ed. in English)
|September 8, 2025
概括
使用带有露面 (110) 面的热性伊米达酸框架-8 (ZIF-8) 的工程分离器提高了金属电池的性能. 这种离子调节分离器抑制树突,并改善快充应用的循环稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属电池 (LMB) 提供高能量密度,但在快速充电期间面临离子运输和树形成的挑战.
- 现有的隔离器往往无法提供足够的离子调节和结构稳定性,限制了LMB的性能和安全性.
研究的目的:
- 为稳定和快速充电的金属电池开发一个面向工程,离子调节分离器.
- 通过工程分离器研究离子定和离子流量控制的机制.
主要方法:
- 制造一种以热立体伊米达酸框架-8 (ZIF-8) 为基础的分离器,具有优先暴露的 (110) 面.
- 使用易斯酸位 (Zn中心) 描述分离器的离子结合特性.
- 在各种条件下,对LIFECU,LiFePO4 (LFP) 电池,LIFECUNCM811电池和LIFECULFP袋式电池进行电化学测试.
主要成果:
- 设计的ZIF-8分离器在2 mA cm−2下,在98.7%的库伦比效率下,证明了Li
- 包括LFP和高负载NCM811在内的全电池显示出优异的库伦比克效率 (LFP的3000个循环中99.9%) 和容量保留.
- 一个高负载的Li水LFP袋式电池表现出强大的循环性能,验证了分离器在实际电池设计中的潜力.
结论:
- 基于ZIF-8的面体工程,阳离子调节分离器在抑制树突和增强离子运输方面是有效的.
- 选择性离子定机制有助于改善界面稳定性和电池周期寿命.
- 这种方法为推进稳定,快速充电的金属电池提供了一种多功能和可扩展的战略.
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