阳离子调节的化溶解膜使金属电池稳定
Siru He1, Jianwei Xiong2, Huimin Yuan1
1Department of Materials Science and Engineering, and SUSTech Energy Institute for Carbon Neutrality, Southern University of Science and Technology, Shenzhen 518055, China.
ACS applied materials & interfaces
|November 20, 2024
概括
一种新的非易燃的全化电解质提高了金属电池的性能. 它使用离子参与溶解盖形成保护层,提高稳定性和容量保留.
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:
- 金属电池中的常规碳酸盐电解质会产生副作用,导致容量衰减和安全问题.
- 电解质分解和树的生长是阻碍高性能金属电池发展的主要挑战.
研究的目的:
- 开发一种非易燃的全化电解质,具有离子参与的Li+溶解盖,以提高金属电池的性能.
- 为了研究新型电解质系统的电化学特性和稳定性.
主要方法:
- 使用理论计算和X射线光电子谱 (XPS) 来分析电解质的行为.
- 电化学性能通过使用不同电压的 Liidiye NCM811 电池循环试验进行了评估.
主要成果:
- 含有乙烯2,2,2-三乙烯碳酸盐 (ETFEC) 和甲基二乙酸盐 (MDFA) 的全化电解质促进了金属阳极上富含LiF的固体电解质层的形成.
- 这一层诱导了均的金属沉积,并增强了溶剂减少的稳定性,防止了快速的容量下降.
- 立体电池 NCM811 电池表现出极好的容量保留:在 4.3 V 的 430 个循环后保持 71.48%,在 4.5 V 的 225 个循环后保持 64.52%.
结论:
- 开发的非易燃的全化电解质有效抑制了副作用和溶剂分解.
- 在金属电池中,参与阳离子溶解膜策略对于实现稳定的循环和高能量密度至关重要.
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