Journal
JOURNAL OF POWER SOURCES
Volume 416, Issue -, Pages 148-154Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2019.01.087
Keywords
Lithium-ion secondary cell; Thermal runaway; Storage degradation; State of charge; Self-heating rate; Relative heat generation rate
Funding
- International Joint Research Program for Innovative Energy Technology of the Ministry of Economy, Trade and Industry, Japan
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It is important for large-scale lithium-ion secondary cells to function in a safe and stable manner. Little information is available on the parameters determining the transitions between non-heating, self-heating, and thermal runaway processes of degraded lithium-ion secondary cells. Thermal characterization of the degraded cells is important to identify the impact of degradation on the safety limits of these cells. Accelerating rate calorimeter (ARC), operated in a heat-wait-search mode, is capable of characterizing the thermal behavior of lithium-ion cells. Here, the self-heating and relative heat generation rates of storage-degraded lithium-ion cells during thermal runaway are investigated. Twenty-five 18650-type LiCoO2-based secondary cells are degraded during storage at 80 degrees C with various states of charge (SOCs), then the thermal behavior of the cells was analyzed by carrying out ARC measurements. The correlations between the onset temperature of thermal runaway, self-heating rate, and heating rate of each cell are investigated. It was found that the self-heating rate correlates linearly with the onset temperature of thermal runaway, while the relative heat generation rate correlates with it exponentially. The cells charged to 100% SOC presented the lowest onset temperatures of thermal runaway.
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