通过双极-双极相互作用调整Li+溶解结构以构建高性能金属电池的无机丰富接相
Chuan Wang1, Sheng Liu1, Haoyang Xu1
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1# Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|January 3, 2024
概括
将氧化二玻酸盐 (LiDFOB) 添加到电解质中,可以通过稳定固体电解质间相 (SEI) 和防止树突的生长来提高金属电池的性能,从而使电池寿命更长.
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:
- 金属电池 (LMB) 面临着不稳定的固体电解质介相 (SEI) 和树形成的挑战,这阻碍了实际应用.
- 优化Li+溶解结构是改善SEI特性和实现无树的Li沉积的关键.
研究的目的:
- 研究氧化二玻酸盐 (LiDFOB) 对LMB电解质中的Li+溶解结构和SEI形成的影响.
- 通过电解质修改,提高金属电池的稳定性和性能.
主要方法:
- 利用LiDFOB和二甲氧乙 (DME) 溶剂之间的离子双极相互作用来修改Li+溶解.
- 分析了基和基LiFePO4电池的SEI组成和电化学性能.
主要成果:
- 添加LiDFOB削弱了Li+-DME相互作用,促进了富含无机物SEI的形成,并抑制了树突.
- 使用LiDFOB的电解质显示出更好的氧化稳定性.
- 电池实现了超过1800小时的可循环性,具有较低的超电位 (18.2mV).
- 在100个循环后,LiFePO4全细胞保持了93.4%的容量,并具有99.3%的库伦比效率.
结论:
- DFOB有效调节+溶解和SEI结构,导致没有树的沉积.
- 修改后的电解质显著提高了金属电池的循环寿命,稳定性和效率.
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