双弱协调电解质可用于5V和高温金属电池
Jialin Song1, Pan Luo2, Qinghua Yang3
1School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|May 3, 2025
概括
使用三2,2,2-三乙烯酸 (TFEP) 和乙氧三三酸 (PFPN) 的新型双弱协调策略增强了金属电池的稳定性和安全性. 这种方法优化了高压阴极的接口,实现了高能量密度和在高温下提高性能.
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
- 电池技术 电池技术
背景情况:
- 多层氧化物阴极提供高容量和电压,但在接口稳定性方面面临挑战,特别是在高电荷状态和温度下.
- 开发稳定的接口对于高压金属电池的可靠运行至关重要.
研究的目的:
- 设计一种新的双弱协调策略,用于在高压金属电池中创建强大的接口.
- 为了提高金属电池的循环稳定性,能量密度和安全性.
主要方法:
- 开发了一种双弱协调策略,使用三2,2,2-三乙 (TFEP) 作为溶剂和乙氧三三 (PFPN) 作为稀释辅溶剂.
- 这一策略修改了Li+离子周围的溶解结构,减少了溶解障碍,形成了混合有机-无机接口.
- 在各种金属电池配置中评估了电解质性能,包括在高温和高电压条件下测试了Li RadiusNMC811和Li RadiusNLRMO电池.
主要成果:
- 研发的DWCE电解质在60°C和4.7V的Li particleNMC811细胞,以及在4.8V和5.0V的Li particleNMCMO细胞中表现出了显著的循环稳定性.
- 采用DWCE的5.2Ah LiidiyeLRMO袋式电池实现了495Wh kg-1的高能量密度.
- 基于DWCE的电池在热失控条件下显著提高了安全性.
结论:
- 双弱协调策略有效地提高了高压金属电池的稳定性和性能.
- 这种方法为设计高能量密度金属电池的先进电解质提供了通用政策.
- 这些发现为更安全,更高效的下一代储能系统铺平了道路.
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