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用量身定制的添加剂增强高压实用金属电池
Jinhai You1,2, Qiong Wang3,4, Runhong Wei2
1College of Energy, Xiamen University, Xiamen, 361005, People's Republic of China.
Nano-micro letters
|July 29, 2024
概括
这项研究引入了一种新的以为基础的电解质 (FGN-182),用于稳定的金属阳极,具有双盐,在高能电池中实现高库伦比效率和出色的循环性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属阳极具有高能量密度,但受到树增长和低库伦比效率 (CE) 的影响.
- 基于以太的电解质是有希望的,但对于实际的金属电池应用需要稳定.
研究的目的:
- 为高性能金属电池开发一种稳定的以太电解质.
- 为了提高阳极稳定性和使用双盐添加剂的库伦比克效率.
- 为了提高金属袋式电池的高压性能和循环稳定性.
主要方法:
- 一种以为基础的电解质 (FGN-182) 配合二 (fluorosulfonyl) 胺 (LiFSI) 和酸 (LiNO3) 作为双盐的配方.
- 固体电解质相间膜 (SEI) 的表征和Li+运输动力学.
- 测试使用高负载氧化物 (LCO) 阴极和超薄阳极的Li
主要成果:
- 双盐电解质促进了强大的SEI薄膜,增强了Li + 运输,在Li 燃料电池中平均达到99.56%的CE.
- 袋式电池表现出极好的循环稳定性,在使用高容量LCO阴极后125个循环后保持80%的容量.
- 1,3,6-tricyanohexane的加入改善了高电压 (4.4 V) LCO 下载数据库包电池循环,在93个循环中维持了性能.
结论:
- 具有双盐的FGN-182电解质可以实现超稳定的金属阳极,克服常见的限制.
- 对于阴极和阳极使用功能添加剂的策略显著改善了高电压下的利用率和电解质耐受性.
- 这项研究为使用金属阳极与以太基电解质的实用,高能量密度电池铺平了道路.
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