Thermal characteristics of 80 °C storage-degraded 18650-type lithium-ion secondary cells

被引:29
作者
Taniguchi, Shuichi [1 ]
Shironita, Sayoko [1 ]
Konakawa, Kotaro [1 ]
Mendoza-Hernandez, Omar Samuel [1 ,2 ]
Sone, Yoshitsugu [2 ]
Umeda, Minoru [1 ]
机构
[1] Nagaoka Univ Technol, Fac Engn, Dept Mat Sci & Technol, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan
[2] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan
关键词
Lithium-ion secondary cell; Thermal runaway; Storage degradation; State of charge; Self-heating rate; Relative heat generation rate; BATTERY; RUNAWAY; SAFETY; ELECTROLYTE; IMPEDANCE; BEHAVIOR; IMPACT; STATE; ARC;
D O I
10.1016/j.jpowsour.2019.01.087
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:148 / 154
页数:7
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