阳离子增强溶解离子液体电解质,使金属电池中的高阴极稳定
Wenhong Zou1, Jun Zhang1, Mengying Liu1
1College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China.
Advanced materials (Deerfield Beach, Fla.)
|February 9, 2024
概括
阳离子增强溶解离子液电解质 (ASILEs) 增强离子运输和金属电池的稳定性. 这一突破使得高安全性,高能量密度的电池能够提高性能和实际可行性.
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:
- 离子液体电解质 (ILEs) 对于开发安全,高能量密度的金属电池 (LMB) 至关重要.
- 对于ILEs来说,一个关键的挑战是由于离子聚合,导致Li+运输缓慢,从而限制了电池的性能.
- 解决离子聚类对于推进LMB技术至关重要.
研究的目的:
- 设计和研究新的离子增强溶解离子液体电解质 (ASILEs).
- 为了增强Li+运输,稳定接口,并保持LMB的阻燃性能.
- 为开发高性能电池的先进ILEs提供基本指导.
主要方法:
- 通过结合含有双硫胺 (FSI-) 和双三甲硫胺 (TFSI-) 离子的化碳化合物,开发出ASILEs.
- 评估了Li+运输,与LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极的界面稳定性,以及阻燃性能.
- 经过测试的Li/NCM811电池和袋式电池,以评估电化学性能,包括容量,保留和能量密度.
主要成果:
- 通过增强阳离子协调,ASILEs有效地减少了离子聚类.
- 设计的ASILEs表现出高的初始特异性容量 (203mAhg-1在0.1°C) 和优秀的容量保留 (81.6%在500个周期在1.0°C).
- 一个Ah级Li/NCM811袋式电池实现了386Wh kg-1的高能量密度,证明了其实际可行性.
结论:
- 开发的ASILEs为ILEs中缓慢的Li+运输提供了实际解决方案.
- 这些电解质显著提高了金属电池的性能和安全性.
- 这项研究为设计下一代储能设备的先进ILE提供了一条途径.
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