软碳电池储能电站低温特性研究

Study on low temperature characteristics of soft carbon batteries for energy storage power plant

锂离子电池因具有优秀的倍率性能及循环寿命而得到广泛应用,但其较差的低温性能限制了它的进一步发展。而负极材料已成为影响锂离子电池低温性能的重要因素。软碳电池采用新型负极材料,其低温性能得到很大的改善。研究了电池内阻及制造工艺两方面对锂离子电池低温特性的影响,并在已有锂离子电池的基础上提出一种球型结构软碳作为负极材料,制备了锂离子电池,并用实验验证了该材料对电池低温性能的影响。实验结果证明,当温度为25和55℃时,放电深度均为100%。当温度进一步降低,放电深度有所下降,温度越低,下降越明显,但是总体下降幅度不大,在温度为-20℃时,放电深度依然能够达到80%以上。这证明软碳材料电池具有优秀的低温性能,这将扩大锂离子电池的应用范围,为某些特殊环境下的应用提供可能。

Lithium-ion batteries have been widely applied due to their excellent rate performance and cycle life,but their poor low temperature performance limits its further development.The negative electrode has become an important factor affecting the low temperature performance of batteries.The soft carbon battery adopted a novel negative material,and its low-temperature performance was improved.This paper studied the effect of internal resistance and manufacturing process on low temperature characteristics of lithium-ion battery.Based on the existing lithium-ion battery,a new type of spherical structure soft carbon was proposed as negative electrode material,the test batteries were prepared,and some tests were carried on the prepared batteries.The test results show that when the temperature is 25 and 55℃,the depth of discharge is 100%;when the temperature decreases further,the depth of discharge decreases synchronously;the lower the temperature,the more obvious the depth of discharge declines,but the overall decline is not significant.At-20℃,the depth of discharge can still reach more than 80%.This proves that the soft carbon material battery has excellent low temperature performance,which will expand the application fields of lithium ion battery and provide the possibility for its application in some special area.