Thermal runaway of commercial 18650 Li-ion batteries with LFP and NCA cathodes – impact of state of charge and overcharge

By Andrey W. Golubkov, Sebastian Scheikl, René Planteu, Gernot Voitic, H. Wiltsche, C. Stangl, G. Fauler, Alexander Thaler, V. Hacker. 2015

456 citations recorded by the source corpus.

Thermal runaway characteristics of two types of commercially available 18650 cells, based on LixFePO4 and Lix (Ni0.80Co0.15Al0.05)O2 were investigated in detail. The cells were preconditioned to state of charge (SOC) values in the range of 0% to 143%; this ensured that the working SOC window as well as overcharge conditions were covered in the experiments. Subsequently a series of temperature-ramp tests was performed with the preconditioned cells. Charged cells went into a thermal runaway, when heated above a critical temperature. The following thermal runaway parameters are provided for each experiment with the two cell types: temperature of a first detected exothermic reaction, maximum cell temperature, amount of produced ventgas and the composition of the ventgas. The dependence of those parameters with respect to the SOC is presented and a model of the major reactions during the thermal runaway is made.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/914b8d4aff09f27f34f30c209ff615b392dbc818

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Citations in the corpus

• Pursuing safer batteries: Thermal abuse of LiFePO4 cells (2019, background): “The amount of oxygen available is greater for charged cells (cathode delithiated), while even at 0% SOC there may still be small amounts of O2 released, as the cathode can not be fully lithiated due to irreversible capacity loss during the formation cycles of the cell (Golubkov et al., 2015).”