期刊
ENERGY
卷 159, 期 -, 页码 547-557出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2018.06.173
关键词
Lithium-ion batteries; Safety; Thermal runaway; State of charge; Enthalpy
资金
- Volkswagen Foundation [85414]
Thermal runaway of three lithium ion cells (A - NCA/Graphite, B - LFP/Graphite, C - NCA/LTO) at 0%, 50%, and 100% state of charge (SOC) is studied by Accelerating Rate Calorimetry (ARC). Thermal behaviour of harvested positive and negative electrodes at three SOC (0%, 50%, and 100%) is analyzed using Differential Scanning Calorimetry (DSC). Thermal stability of recovered separators is also investigated by DSC. Harvested electrodes and separators are studied alone and in contact with a liquid electrolyte. The thermal behaviour of each component and its contribution is quantified and thoroughly discussed. A crucial negative impact of the state of charge and presence of highly flammable liquid electrolyte on the thermal instability of the investigated cells and electrode - electrolyte systems is clearly revealed. Among studied cells, LiFePO4/Graphite one is the safest due to intrinsic thermal stability of lithium iron phosphate LiFePO4 based cathode and despite the fact of using a microporous polyolefin separator with limited thermal stability. (C) 2018 Elsevier Ltd. All rights reserved.
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