Survey of Gas Expansion in Li-Ion NMC Pouch Cells

By Julian Self, C. Aiken, R. Petibon, J. Dahn. 2015

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This preliminary study investigates initial gas formation in Li[Ni 0.4 Mn 0.4 Co 0.2 ]O 2 (NMC442) pouch cells with three different electrolytes: 3:7 ethylene carbonate : ethyl methyl carbonate (EC:EMC) w/ 1 M LiPF 6 as the control, control + 2% prop-1-ene-1,3-sultone (PES) and control + 2% vinylene carbonate (VC). In situ volume measurements reveal three main features of gas evolution, an initial gas step, gas absorption, and a second gas step at higher voltage. Gas chromatography-mass spectrometry is employed to identify the gaseous compounds. This work illustrates the strong dependence of volume change due to gas evolution on additives, charging rate and temperature.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/7e2b81f561dc9826e291fedc5126c37492b4acde