改善锂离子电池的低温充电性能

摘要

通过优选电池材料,提高锂离子电池的低温充电性能.与常规材料相比,采用二次颗粒石墨(一次、二次粒子的D50分别为9 ～10 μm和15 ～ 17 μm)、水溶性粘合剂LA132和添加乙酸丙酯(PA)的低温型电解液,可提高电池的低温充电性能.负极采用95.5％二次颗粒石墨、1.0％导电剂和3.5％水溶性粘合剂LA132,电解液含有低温溶剂时,可达到最优效果.在-5℃、-10℃、-15℃和-20℃低温条件下,电池以0.15 C电流进行恒流充电,Li+不可逆损耗比例分别为0.01％、0.03％、1.01％和1.35％,负极片表面均未出现析锂现象.%The low-temperature charging performance of Li-ion battery was improved by optimizing the battery materials.Compared to the normal materials,the low-temperature charging performance of the battery was improved by using secondary particulate graphite (the D50 of the first and secondary particulate were 9-10 μm and 15-17 μm,respectively),aqueous binder LA132 and low-temperature electrolyte added propy acetate (PA).The result was best when 95.5％ secondary particulate graphite,1.0％ conductive agent and 3.5％ aqueous binder LA132 were used in the anode,and electrolyte contained low-temperature solvent.When the battery was galvanostatic charged with 0.15 C at the low temperature of-5 ℃,-10 ℃,-15 ℃ and-20 ℃,the ratio of Li+ irreversible loss was 0.01％,0.03％,1.01％ and 1.35％,respectively.There were no lithium dendrites on the anode surface.