摘要
Abstract
To promote the low-temperature applications of lithium batteries and further develop better low-temperature lithium batteries,the understanding of the performance and capacity loss path of lithium batteries at low temperatures is of practical significance.In this paper,the experimental object was a lithium battery in which the cathode material consisted of lithium cobaltate ( with a better low-temperature performance ) and ternary lithium ( with a higher specific capacity ) and the anode material was lithium titanate.To study the discharge characteristics of lithium batteries at low temperatures,the following experiments were designed,i.e.,discharge experiments at different discharge rates,hybrid pulse power characteristics experiments,and charge-discharge experiments at 0.05C discharge rate.Experimental results showed that at low temperatures,the capacity loss of lithium batteries was reversible,and when the discharging temperature returned to a normal temperature,the performance of lithium batteries would restore to its original state.Temperature and discharge rate had a significant effect on the discharge capacity of lithium batteries.At low temperatures,both the ohmic resistance and polarization internal resistance would increase with the decrease of temperature,but the polarization internal resistance increased even faster.The capacity loss of lithium batteries was mainly due to the loss of active materials,loss of lithium inventory and increase of internal resistance,and although the effects of these three factors were different in various temperature ranges,the loss of active materials had a greater influence as a whole.关键词
钴酸锂/三元锂/钛酸锂/低温/放电性能/可逆容量损失Key words
Lithium cobaltate/ternary lithium/lithium titanate/low temperature/discharge characteristics/reversible loss of capacity分类
信息技术与安全科学
