石墨/LiFePO_4锂离子电池高温存储后的性能

将荷电态(SOC)为2%(剩余电量为0.1 Ah)的石墨/LiFePO_4锂离子电池分别在不同温度(25℃、50℃、60℃和70℃)下存储6 h,测试常温/高温荷电保持能力、低温(-20℃)放电和常温1 C循环(2.50~3.65 V)性能。电池的常温/高温荷电保持能力和低温(-20℃)放电性能均随存储温度的升高先增强、后减弱,经60℃存储后,电池的上述性能最优;在常温下1 C循环1 500次后,高温(≥50℃)存储后电池的容量保持率约为88%。

Performance of graphite/LiFePO4 Li-ion battery after high temperature storage

The performance of 2 ％ state-of-charge (SOC) (the remained capacity was 0.1 Ah) for graphite/lithium iron phosphate (LiFePO4) Li-ion battery after stored for 6 h under different temperatures (25 ℃,50 ℃,60 ℃ and 70 ℃) was studied.The normal/high temperature charge retention ability,low temperature(-20 ℃) discharge and normal temperature 1 C cycle(2.50-3.65 V) performance were tested.The normal/high temperature charge retention ability and low temperature (-20 ℃) discharge performance of the batteries increased firstly and then decreased with the increasing of store temperature,when the store temperature was 60 ℃,the optimal value of performance mentioned above was achieved.The discharge capacity retained round 88 ％ for the stored temperature above 50 ℃ of rated capacity after 1 500 cycles at 1 C.