Journal
RSC ADVANCES
Volume 3, Issue 37, Pages 16359-16364Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra42611d
Keywords
-
Categories
Funding
- Swedish Hybrid Vehicle Centre (SHC)
Ask authors/readers for more resources
Independent of the specific electrode chemistry, the state-of-the-art lithium ion battery electrolytes based on LiPF6 in organic solvents have a low thermal abuse tolerance and poor cycle life at elevated temperatures. We present here a detailed investigation of the initial stages of the thermal decomposition of LiPF6 in EC/DMC stored at 85 degrees C using Raman and NMR spectroscopy. During storage (up to 160 h), significant amounts of CO2 are evolved, as detected in the Raman spectra. Time-resolved H-1, P-31, and F-19 NMR spectra show the evolution of POF3, POF(OH)(2), POF2(OCH2CH2)(n)F, and POF2OMe as reactive decomposition products. Our unique F-19 NMR approach, measuring while heating with both high energy and time resolution, allows for a first quantitative analysis of the evolved species and reveals several decomposition reactions during the first 30 min up to 72 h, where the rates of HF and POF2OMe formation are surprisingly linear. EC is found to be much less reactive compared to DMC. All information is used in the formulation of an updated decomposition pathway chart for LiPF6 based electrolytes.
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