Choice for graphene as conductive additive for cathode of lithium-ion batteries

摘要

Graphene is a promising conductive additive for the lithium-ion batteries (LIBs) and shows great poten-tial especially with its fast development of the large scale fabrication technology. This work has explored the influence of the incorporation of graphenes prepared by three typical methods on the electrochemical performance of the LiCoO2-based cathode focusing on the choice for the effective graphene as conductive additive for the cathode of LIBs. Through the comparison of the intrinsic characteristics of graphenes and the electrochemical performance of electrodes with graphene, it is found that graphene with low disorder degree and large size is not suitable for LiCoO2 cathodes as conductive additive. Conversely, the graphene with oxygen functional groups, relatively low surface area and proper size displays much better electro-chemical performance when it is used as conductive additive. This work also demonstrates the trans-mission mechanism for different graphenes as conductive additives in the LiCoO2 materials, and further reveals that the conductivity of graphene is not the only factor as conductive additives, surface chem-istry and sheet size of the graphene are also essential factors which greatly influence the electrochemical performance of electrode. In addition, when combined with Super P, only 1% graphene is enough to con-struct an efficient conductive network in the electrode. This study also gives a new sight on the practical application of graphene as conductive additive for high performance LIBs.