离子液体增强以太局部高度电解质的协调使高压金属电池成为可能
Zhuo Han1, Likun Chen1, Guorui Zheng1
1Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center, Institute of Materials Research (IMR), Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|March 3, 2025
概括
将离子液 (Pyr13TFSI) 添加到电解质中,可以稳定1,2-二甲基甲 (DME),从而提高金属电池的性能和周期寿命. 这提高了对高能量密度应用的阴极电解质相间稳定性和离子传输.
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:
- 高压金属电池中的局部高度电解质 (LHCE) 由于在阴极接口上的1,2-二次氧乙 (DME) 分解而遭受不稳定的有机碎片.
- 这种分解显著降低了高能量密度金属电池的循环性能.
研究的目的:
- 开发一种战略,以提高电解质中溶解DME的稳定性,以提高金属电池的性能.
- 调查离子液体在稳定电解质和阴极接口中的作用.
主要方法:
- 将1-Methyl-1-propyl pyrrolidinium bis(trifluoromethanesulfonyl) imide (Pyr13TFSI) 作为辅溶剂添加到散装电解质中.
- 分析TFSI离子和DME分子之间的离子双极相互作用.
- 评估阴极电解质相间稳定性 (CEI) 和Li+运输动态.
- 电化学循环表现测试Li的硬币电池. Li的硬币电池Ni0.8Co0.1Mn0.1O2.
主要成果:
- 添加Pyr13TFSI加强了离子双极相互作用,稳定了溶解DME并减少了不稳定的有机碎片形成.
- 离子液促进了由离子衍生的稳定CEI的形成,具有增强的电化学稳定性和Li+运输.
- 硬币电池表现出极好的循环稳定性,在4.5V的1800个循环后保持了76.1%的容量,在4.6V的800个循环后保持了77.1%的容量.
- 具有厚厚的阳极和高阴极负载的电池在175个循环中实现了73.35%的容量保留.
结论:
- 使用离子液调节电解质成分相互作用是优化先进金属电池协调化学的可行策略.
- 使用Pyr13TFSI有效地提高了高能量密度金属电池的稳定性和电化学性能.
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