Thermal Abuse Tests on 18650 Li-Ion Cells Using a Cone Calorimeter and Cell Residues Analysis

Maria Luisa Mele, Maria Paola Bracciale, Sofia Ubaldi, Maria Laura Santarelli, Michele Mazzaro, Cinzia Di Bari and Paola Russo
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Maria Luisa Mele: Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
Maria Paola Bracciale: Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
Sofia Ubaldi: Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
Maria Laura Santarelli: Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
Michele Mazzaro: Direzione Centrale per la Prevenzione e la Sicurezza Tecnica, Corpo Nazionale dei Vigili del Fuoco, 00178 Rome, Italy
Cinzia Di Bari: ENEA DTE-PCU-STMA, CR Casaccia, Anguillarese 301, 00123 Rome, Italy
Paola Russo: Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy

Energies, 2022, vol. 15, issue 7, 1-19

Abstract: Lithium-ion batteries (LIBs) are employed when high energy and power density are required. However, under electrical, mechanical, or thermal abuse conditions a thermal runaway can occur resulting in an uncontrollable increase in pressure and temperature that can lead to fire and/or explosion, and projection of fragments. In this work, the behavior of LIBs under thermal abuse conditions is analyzed. To this purpose, tests on NCA 18,650 cells are performed in a cone calorimeter by changing the radiative heat flux of the conical heater and the State of Charge (SoC) of the cells from full charge to deep discharge. The dependence of SoC and radiative heat flux on the thermal runaway onset is clearly revealed. In particular, a deep discharge determines an earlier thermal runaway of the cell with respect to those at 50% and 100% of SoC when exposed to high radiative heat flux (50 kW/m 2 ). This is due to a mechanism such as an electrical abuse. Cell components before and after tests are investigated using Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy—Energy Dispersive X-ray Spectroscopy (SEM-EDS) and X-ray Diffraction (XRD) to determine the structural, morphological, and compositional changes. It results that the first reaction (423–443 K) that occurs at the anode involves the decomposition of the electrolyte. This reaction justifies the observed earlier venting and thermal runaway of fully charged cells with respect to half-charged ones due to a greater availability of lithium which allows a faster kinetics of the reaction. In the cathode residues, metallic nickel and NO are found, given by decomposition of metal oxide by the rock-salt phase cathode.

Keywords: lithium-ion cell; thermal runaway; cone calorimeter; SoC; over-discharge; DSC; SEM-EDS; XRD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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