用于金属电池的高压和本质上安全的电解质
Zhixin Xu1, Xiyue Zhang2, Jun Yang3
1Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Nature communications
|November 14, 2024
概括
研究人员开发了一种用于金属电池 (LMB) 的新型高压和安全电解质 (VSE). 这种单分子电解质提高了能量密度,循环寿命和安全性,克服了传统混合溶剂系统的局限性.
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) 的当前电解质通常涉及混合溶剂,导致性能和安全之间的妥协.
- 限制包括无法同时实现高能量密度,长周期寿命和增强的安全性.
- 需要先进的电解质来克服下一代LMB的这些固有的缺点.
研究的目的:
- 为LMBs设计和合成一种新的高电压和安全电解质 (VSE).
- 通过将多个功能组集成到单个分子中来克服传统混合溶剂电解质的局限性.
- 证明VSE在实现高性能和安全的LMB方面的能力.
主要方法:
- 单分子电解质 (VSE) 的分子设计和合成,具有集成的功能组.
- 电化学表征,包括电化学稳定窗口 (ESW) 测量.
- 在各种条件下对Li金属阳极,Li水晶LCO和Li水晶LNMO硬币和袋式电池的性能评估.
主要成果:
- 该VSE表现出大约5.6V的宽电化学稳定性窗口.
- 在金属阳极中实现高库伦比克效率 (>99.3%).
- 在LICADYLCO电池中表现出优异的容量保留 (92%在500个循环后),在3.5Ah袋式电池中具有高能量密度 (531Wh kg-1),没有安全问题.
- 在5.0V LiDaLNMO电池中实现了稳定的循环 (200个周期没有容量衰减).
结论:
- 开发的VSE电解质为高压和内在安全的LMB提供了一个有前途的解决方案.
- 单分子电解质设计有效地整合了所需的特性,超越了混合溶剂的限制.
- 这种方法为先进的储能系统中合理的电解质设计提供了新的方向.
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