Thermo-Electrochemical Stability Analytics of Electrode Materials
2019
Parmananda, Mukul | Ryali, Bharadwaja | Mukherjee, Partha P.
Thermal safety concerns of lithium-ion batteries continue to be a pervasive impediment toward vehicle electrification, grid storage, and space exploration. The advent of high capacity cathode materials necessitates a clear understanding of the associated reaction kinetics at elevated temperatures. Here, we present a comprehensive thermo-electrochemical analytics approach to study simulated calorimetric experiments and kinetic parameters estimation for understanding material specific thermal stability. In particular, the focus of the present study is on the fundamental understanding of the thermal stability of disparate cathode materials for lithium-ion intercalation chemistry. Unfortunately, stability of high-capacity cathode materials at elevated temperatures is often challenged by undesirable side reactions including oxygen evolution that promotes electrolyte combustion. The electrochemistry coupled thermo-kinetic strategy presented here acknowledges the multiple abuse reactions associated with the cathode active material and electrolyte interaction at elevated temperatures, which is elucidated via thermal runaway potential based on simulated oven test signatures. The proposed thermo-electrochemical analytics could prove decisive in deconvolving the innate thermal instability signatures of electrode–electrolyte pairs in Li-ion battery chemistry.
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