离子液添加剂缓解高压无阳极金属电池的损失和腐蚀
Minghan Zhou1, Weijian Liu1, Qili Su2
1College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, Hunan University, Changsha 410082, China.
ACS nano
|November 15, 2024
概括
离子液体添加剂可以防止高压无阳极金属电池的腐蚀和损失. 这使得电池在高潜力和高能量密度下能够稳定运行.
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
- 电池技术 电池技术
背景情况:
- bis{(fluorosulfonyl) imide (LiFSI) 的缩电解质适用于没有阳极的金属电池 (AFLMB).
- 这些电解质在高电位时面临着腐蚀的挑战,限制了电池的性能.
- 缓解库存损失和腐蚀对于实际的AFLMB至关重要.
研究的目的:
- 开发一种二元离子液体 (IL) 电解质添加剂,同时解决4M LiFSI/DME中的Li库存损失和Al腐蚀问题.
- 研究AFLMB中电极-电解质接口上的IL添加剂的机制.
- 为了证明使用IL添加的电解质来提高AFLMBs的性能.
主要方法:
- 一种二进制IL添加剂的配方,该添加剂含有1-甲基-1-基 pyrrolidinium 阴离子 (Pyr14+),二氧化 (DFOB-) 和二酸 (PO2F2-) 阳离子.
- 电化学表征涂/脱落,循环稳定性和界面行为.
- 分析阳极上的固体电解质间相 (SEI) 组成和阴极上的被动膜.
主要成果:
- 该IL添加剂在阳极上促进了强大的Li3N和LiF丰富的SEI,确保可逆的Li/脱落和均沉积.
- ILs修改了Li+溶解结构,增强了Li+转移数 (tLi) 和溶解动力学.
- 在阴极上形成密集的LiF和AlF丰富的被动膜,有效抑制Al腐蚀.
- 在4.5V下稳定运行. 电池的电压为0.7Fe0.3PO4.
- 配备了NCM613高负载 (4.0 mA h cm-2) 的电池,维持了142个循环,保持了80%的容量.
结论:
- 二元IL添加剂有效地减轻了高压AFLMB中的Li库存损失和Al腐蚀.
- ILs增强了接口稳定性和离子传输特性,从而提高了电池的性能.
- 这项研究为设计用于实际高压AFLMB的先进电解质提供了可行的策略.
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