Abstract: The lithium-ion deembedding kinetics study of two different groups of conductive agents adding conductive carbon black and conductive carbon black composite graphene as well as the battery assembled by LiNi_0.5Co_0.2Mn_0.3O₂ is conducted by cyclic voltammetry and AC impedance method. The lithium ion diffusion coefficient was calculated to explore the effect of different conductive agents on the LiNi_0.5Co_0.2Mn_0.3O₂ lithium ion deintercalation kinetics ring. The electrochemical performance tests show that the first discharge specific capacities of adding a single conductive carbon black conductive agent, as well as a composite conductive agent of graphene and conductive carbon black, are 166 and 184 mAh/g, respectively. The discharge specific capacity of graphene and conductive carbon black composite conductive agents is significantly improved.