工艺条件对高比表面积石墨电化学性能影响

Influence of technology on electrochemical performance of high specific surface area artificial graphite for lithium ion batteries

锂离子电池以其高容量、长循环寿命、高安全性的显著特点得到越来越多的关注,高容量是锂离子电池发展的必然趋势。对一种用于锂离子电池负极的比表面积高达4m2/g的人造石墨的物性指标、结构、电化学性能进行了分析,并对电解液及添加剂、工艺条件对负极材料电化学性能的影响进行了相关研究,为实现以此材料为负极的高能量密度锂离子电池产业化应用提供一定的指导作用。结果表明,这种高比表面积的人造石墨具有特殊的微孔结构,含有的活性部位增多,反应面积增大,提高活性材料的利用率,表现出高容量和高倍率性能。

Presently lithium ion battery has won more and more attentions for its characters such as high specific capacity, excellent cycle performance, safety, and etc. Among all these characters, high specific capacity is the most important. The physical properties, structure and electrochemical performance of an artificial graphite with a high surface area of 4 m2/g were analyzed. The effects of electrolyte, additive, and manufacture technology on the electrochemical performance of anode were investigated to realize the commercialized application of this material. The results show that the graphite has a special microspore structure, high specific capacity and high power performance. This special structure improves the inhomogeous property and increases the route for lithium diffusion, which improves the utilization ratio of the active material and is the reason that the material has high specific capacity and power.