Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202215866
Keywords
Cathode; Fluoroethylene Carbonate; LiF-Rich SEI; Lithium-Metal Batteries; Low-Concentration Electrolyte
Categories
Funding
- Innovation-Driven Project of Central South University
- National Natural Science Foundation of China
- Natural Science Foundation of Hunan Province of China
- [2019CX033]
- [51904344]
- [52172264]
- [2021JJ10060]
- [2022GK2033]
Ask authors/readers for more resources
The concentration of electrolyte has a significant impact on the performance of rechargeable batteries. Low-concentration electrolytes, composed of common electrolyte components, have been found to enhance the performance of high-voltage Li metal batteries. This is achieved by introducing a fluorine-containing solvent and maintaining a low salt concentration, which results in a LiF-rich and robust solid electrolyte interphase layer.
Concentration of electrolyte has significant effects on performances of rechargeable batteries. Previous studies mainly focused on concentrated electrolytes. So far, only several recipes on low-concentration electrolytes were studied, performing enhanced performance in advanced rechargeable batteries. Here, based on common electrolyte components, a low-concentration electrolyte composed of 0.2 M lithium hexafluorophosphate (LiPF6) solvated in fluoroethylene carbonate (FEC) and ethyl methyl carbonate (EMC) is employed for high-voltage Li metal battery. The synergistic working mechanisms of introducing fluorine-containing solvent in the solvated structure and low salt concentration effect are revealed, resulting in LiF-rich, uniform, and robust solid electrolyte interphase layer and fewer unfavorable decomposition products. As a result, this low-concentration electrolyte significantly enhances electrochemical performances of Li||Li symmetric cells and high-voltage LiCoO2||Li batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available