摘要
研究了低温(-20℃)对锂离子电池充放电性能的影响,并与其常温(25℃)性能作了比较。结果表明:在低温条件下电池的放电性能显著变差,0 2C放电时,放电容量仅为常温放电容量的77%,放电平台比常温时降低了0 5V;1C放电时,放电容量仅为0 2C放电容量的4%。低温充电性能也明显恶化,恒压充电时间增长。锂离子电池低温电化学性能变差,主要是低温条件下锂离子在正负极颗粒中固相扩散阻抗增大引起的。
The charge and discharge characteristics of Li-ion batteries based on C/LiCoO_2 at low temperature (-20 ℃) were (investigated). The effect of low temperature upon the performance of Li-ion battery was discussed. Results showed that Li-ion batteries had poor charge and discharge performance at low temperature. When discharge was carried out at -20?℃, the discharge capacity fell significantly and the voltage plateau lowered. As discharged at a current of 0.2C rate at -20?℃, the battery only retained 77% of the capaciy at room temperature(25 ℃), and the discharge voltage plateau reduced 0.5?V. The high rate discharge capability of the battery also got poor significantly when discharged at low temperature, the rate discharge capacity of 1 C rate only retained 4% of 0.2C rate value. High rate charge got more difficult and constant voltage charge time extended. The poor low temperature performance of the batteries were due to slow kinetics of Li-ion diffusion in cathode and anode materials.
出处
《电池》
CAS
CSCD
北大核心
2004年第2期90-92,共3页
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