A strategy to integrate the preparation of graphene with the preparation of electrode slurry for lithium-ion batteries

Abstract

Because of its unique structure and superior properties, graphene has been used a lot in lithium-ion batteries. The common way of adding graphene not only increases the preparation process but also makes it easy to stack graphene. This paper proposes a strategy to integrate the preparation process of graphene with the preparation process of electrode slurry for lithium-ion batteries. In this paper, graphene dispersions were prepared by the liquid-phase shearing method. On this basis, the centrifugal process was removed and a one-step method was proposed to prepare graphite conductive slurry. The initial capacity of the battery was increased by 8% when the graphene dispersion prepared by the liquid-phase method was used as the graphite anode conductive agent for lithium-ion batteries. The graphite conductive slurry prepared by the one-step method can replace acetylene black, the conductive agent in conventional graphite electrodes. And the initial capacity of the battery was improved by 22% and 12.8% compared to that of the battery with acetylene black and the prepared graphene dispersion as the conductive agent, respectively. The graphene conductive slurry as graphite anode conductive agent can increase the graphite capacity and improve the cycling and multiplicity performance of the anode material. The conductive agent is easy to prepare, low cost, and can effectively improve graphite anode's electrochemical charge and discharge performance.