期刊
JOURNAL OF POWER SOURCES
卷 505, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230082
关键词
Li-ion cells; Low temperature degradation; Thermal runaway behavior; Accelerating rate calorimeter; Constant-rate heating procedure; Differential capacity profile
资金
- International Joint Research Program for Innovative Energy Technology of the Ministry of Economy, Trade and Industry, Japan
Charge/discharge cycling tests of lithium-ion batteries conducted at 1 degrees C showed a substantial decrease in capacity, with aged cells exhibiting unstable thermal behavior and increased risk of thermal runaway.
Charge/discharge cycling tests of lithium-ion batteries were carried out at 1 degrees C. During cycling, the delivered capacity decreased substantially, just 30% of the capacity at 25 degrees C is retained after 45 cycles. The exothermic behavior of fresh and aged cells is analyzed by an accelerated rate calorimeter (ARC) via two different heating protocols. In the heat-wait-search (HWS) experiments, aged cells show an unstable self-heating process from the start of the test, which is aggravated by the depth of discharge (DOD). This is not observed in fresh cells. In the constant-rate heating method, the aged cells show different thermal behavior at different cutoff temperatures, with a high risk of thermal runaway (TR) above 160 degrees C. Most importantly, in aged cells heated to 140 degrees C, TR could be averted by external cooling. Analyses of the differential capacity profiles reveal that thermal stability degradation of aged cells is closely related to the undischargeable Li accumulated in the graphite anode during cycling at 1 degrees C.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据