Research on low temperature characteristics and pinning safety performance of lithium cobalt oxide batteries
This study is centered on exploring the characteristics of lithium cobalt oxide(LCO)batteries under low-temperature conditions and investigating the temperature fluctuations associated with thermal runaway events.Firstly,capacity tests were conducted at varying temperatures to compare the capacity retention rates of ternary lithium-ion batteries and LCO batteries at-30℃.These tests revealed that LCO batteries nearly doubled their discharge capacity in comparison to ternary lithium-ion batteries at this temperature.Secondly,the internal resistance of the batteries was obtained by using the mixed-power pulse characterization test at different temperatures.Then,testing was conducted on the electrochemical impedance of LCO batteries under low-temperature conditions,revealing that at-10℃,-20℃,and-30℃,the charge transfer impedance increases by 180%,702%,and 2 400%,respectively,compared to 0℃.Finally,a nail penetration experiment was executed on the LCO batteries and found that the maximum temperature of the battery surface was not more than 530℃after a steel needle pierces the back of the battery,which was accompanied by a small amount of sparks.Subsequently,substantial smoke generation occurred without any indication of a fire event.
lithium cobalt oxide batteriescapacity retentioncharge transfer impedancenail penetration experiment
NETL
NSTL
万方数据
