聚乙二醇分子量对镍锰酸锂结构及性能的影响

Influence of polyethylene glycol molecular weight on the structure and performance of LiNi_(0.5)Mn_(1.5)O_(4) cathode material

随着新能源汽车的迅速发展,锂离子电池充放电倍率低这一缺陷逐渐显露出来,无法满足人们对快速充电的需求,严重阻碍了电动汽车的推广。以镍锰酸锂材料为研究对象,以聚乙二醇200、聚乙二醇1000、聚乙二醇4000为表面活性剂通过水热法制备不同结构的镍锰酸锂正极材料。结果表明:采用聚乙二醇4000制备的材料颗粒尺寸较小,0.5 C下放电比容量为139 mAh/g,并且其倍率充放电性能明显优于其他材料。

With the promotion of new energy vehicles,the defect of low charge and discharge rate of lithium ion batteries is gradually revealed.Commercial battery materials cannot meet people's needs for fast charging.This seriously hinders the promotion and development of electric vehicles.In this article,the author takes lithium nickel manganese oxide as the research object,using polyethylene glycol 200,polyethylene glycol 1000,and polyethylene glycol 4000 as surfactants,lithium nickel manganate cathode materials with different structures were prepared by hydrothermal method.The results show that the particle size of the material prepared with polyethylene glycol 4000 is smaller,the specific discharge capacity at 0.5 C rate is 139 mAh/g.And its rate charge and discharge performance is significantly better than other materials.