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Open AccessArticle

Understanding the Thermal Runaway of Ni-Rich Lithium-Ion Batteries

IFP Energies Nouvelles, Rond-Point de L’échangeur de Solaize—BP3, 69360 Solaize, France
INERIS, Parc Technologique Alata—BP 2, 60550 Verneuil-En-Halatte, France
Laboratoire de Réactivité et Chimie des Solides, CNRS UMR 7314, Université de Picardie Jules Verne, 33 rue Saint Leu, 80039 Amiens, France
Réseau Sur le Stockage Electrochimique de l’Energie-RS2E-CNRS FR3459, 33 rue Saint Leu, 80039 Amiens, France
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2019, 10(4), 79;
Received: 11 October 2019 / Revised: 9 November 2019 / Accepted: 11 November 2019 / Published: 15 November 2019
The main safety issue pertaining to operating lithium-ion batteries (LIBs) relates to their sensitivity to thermal runaway. This complex multiphysics phenomenon was observed in two commercial 18650 Ni-rich LIBs, namely a Panasonic NCR GA and a LG HG2, which were based on L i ( N i 0.8 C o 0.15 A l 0.05 ) O 2 (NCA) and L i ( N i 0.8 M n 0.1 C o 0.1 ) O 2 (NMC811), respectively, for positive electrodes, in combination with graphite-SiOx composite negative electrodes. At pristine state, the batteries were charged to different levels of state of charge (SOC) (100% and 50%) and were investigated through thermal abuse tests in quasi-adiabatic conditions of accelerating rate calorimetry (ARC). The results confirmed the proposed complete thermal runaway of exothermic chain reactions. The different factors impacting the thermal runaway kinetics were also studied by considering the intertwined impacts of SOC and the related properties of these highly reactive Ni-rich technologies. All tested cells started their accelerated thermal runaway stage at the same self-heating temperature rate of ~48 °C/min. Regardless of technology, cells at reduced SOC are less reactive. Regardless of SOC levels, the Panasonic NCR GA battery technology had a wider safe region than that of the LG HG2 battery. This technology also delayed the hard internal short circuit and shifted the final venting to a higher temperature. However, above this critical temperature, it exhibited the most severe irreversible self-heating stage, with the highest self-heating temperature rate over the longest duration. View Full-Text
Keywords: lithium-ion battery; safety; thermal runaway; Ni-rich; energy storage lithium-ion battery; safety; thermal runaway; Ni-rich; energy storage
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Nguyen, T.T.D.; Abada, S.; Lecocq, A.; Bernard, J.; Petit, M.; Marlair, G.; Grugeon, S.; Laruelle, S. Understanding the Thermal Runaway of Ni-Rich Lithium-Ion Batteries. World Electr. Veh. J. 2019, 10, 79.

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