电镀法制备三维多孔集流体在锂离子电池中的应用  

A three-dimensional porous current collector prepared by electroplating for lithium ion batteries

作　　者：何伟 王金淑 HE Wei;WANG Jinshu(School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]电子科技大学材料与能源学院,四川成都610054

出　　处：《电子元件与材料》2020年第7期53-59,共7页Electronic Components And Materials

摘　　要：相较于石墨类负极材料,金属锂的理论比容量为3860 mAh/g,拥有更具前景的开发空间,因此受到广泛关注。然而,由于在实际应用中,产生枝晶锂与死锂的问题明显,在损耗可逆容量的同时还会造成安全隐患,故而严重制约了其进一步发展。本文采用工艺简单的电镀法制备了一种三维多孔材料。研究发现,将该材料作为负极集流体可获得超过90%的库伦效率,明显高于二维铜箔;在对称电池测试中,循环寿命可达1000 h;应用于全电池时,350圈循环后依然能发挥102 mAh/g的比容量,保持率达到67%。这说明该三维集流体材料被应用于电池中时具有良好的电化学稳定性、循环性能和倍率性能。Compared with graphite anode materials, lithium metal with theoretical capacity of 3860 mAh/g,which has more space for improvement, has attracted wide attention. However, due to obvious weakness of dendrite lithium and dead lithium in practical application, it will not only lose reversible capacity, but also cause security problems. This seriously restricts the further development of lithium ion batteries. In this work, a three-dimensional porous material was prepared by a simple electroplating method. It was found the coulombic efficiency of the material was more than 90% when using as a negative electrode current collector, which was significantly higher than that of the two-dimensional copper foil. In the symmetrical battery test, the cycle life exceeded 1000 h. When applied to a full battery, it still exhibited the capacity of 102 mAh/g after 350 cycles, with the retention rate of 67%. This result shows that the three-dimensional current collector has good electrochemical stability, cycling performance and multiplier performance when applied to the battery.

关 键 词：锂离子电池 集流体 三维结构 电镀法 

分 类 号：TQ152[化学工程—电化学工业]