Infrared spectroscopy of instantaneous decomposition products of LiPF6-based lithium battery electrolytes
Artikel i vetenskaplig tidskrift, 2012

Thermal gravimetric analysis and Fourier transform infrared spectroscopy is performed on the gaseous decomposition products evolved from two LiPF6/organic liquid-based battery electrolytes. During the heating of the electrolytes all gases are continuously transferred to the spectrometer in order to record instantaneous reaction products. We clearly detect PF5 and POF3 that are signatures of the PF6- anion self-dissociation and the decomposition reaction with trace amounts of water; as well as the neat organic solvents. Literature suggests a polymerization process of the carbonate solvents under the release of CO2 as the decomposition route in degradation studies on stored electrolytes. In contrast to that, we detect no CO2 over the whole temperature range and therefore suggest the initial decomposition route to simply consist of solvent evaporation and the thermally driven anion self-dissociation.

LiPF6

Lithium-ion battery

degradation-products

TGA-FTIR

pf5

identification

li

thermal-stability

lipf6

reactivity

Författare

Susanne Wilken

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Patrik Johansson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Per Jacobsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Solid State Ionics

0167-2738 (ISSN)

Vol. 225 608-610

Ämneskategorier

Fysik

Styrkeområden

Energi

Materialvetenskap

DOI

10.1016/j.ssi.2012.02.004