Application Of Graphene Preparation And Lithium-Ion Battery Electrode Slurry Preparation Convergence Strategy

Lithium-ion batteries have received a lot of attention from researchers because of their excellent properties such as no memory effect,environmental friendliness,and low self-discharge.Graphene is widely used in lithium-ion batteries because of its large specific surface area and good electrical conductivity.The addition of graphene can improve the electrical conductivity of lithium-ion batteries’cathode and anode electrodes.The current way of graphene incorporation into lithium-ion batteries has the problems of graphene prone to agglomeration,complex preparation process,and high cost.In this paper,the following research is conducted from the strategy of integrating the preparation of graphene with the preparation process of electrode slurry for lithium-ion batteries:（1）Graphene is prepared by mechanical exfoliation method.Graphite was put into the N-methyl pyrrolidone（NMP）solution,stirred using high-speed shear force,and centrifuged.Tests showed that graphene was successfully exfoliated.It was found that the initial capacity the of graphite electrode was improved by 8%when the prepared graphene dispersion was used as the conductive agent for the anode electrode of lithium-ion batteries.And when the ratio of graphene dispersion to acetylene black was1:2,the initial capacity of the battery was improved and the cycling stability was enhanced.（2）The centrifugal process during graphene preparation was removed.Graphite conductive slurry was prepared by the shear method.The graphite conductive slurry effectively improves the electrochemical performance of graphite anode when used as a conductive agent for graphite anode.When an appropriate amount of acetylene black was added to the conductive slurry mixture as a conductive agent,the cycling stability of the battery was improved.It was found that the graphite conductive paste is not suitable for Li Co O₂ cathodes.（3）The preparation of the conductive agent was integrated with the preparation of the electrode slurry.A one-pot strategy has been proposed for the preparation of graphite anode electrode slurry.Graphite,binder（and conductive agent）were put into NMP solution together,and electrode slurry preparation was carried out with a high-speed homogenizer.This method can greatly reduce the amount of conductive agent to be added.The capacity of the graphite anode material prepared using the one-pot method without the addition of acetylene black conductive agent is comparable to that of conventional graphite electrodes after cycling and stabilization.When 5%acetylene black was added to the electrode preparation by the one-pot method,the initial capacity of the graphite electrode was increased by 31.8%compared with conventional graphite,and the capacity after cycling stabilization was increased by 12.5%,and the multiplicative performance was also improved.Therefore,the strategy of integrating graphene preparation with the lithium-ion battery electrode slurry preparation process can not only reduce the electrode preparation process but also enhance the electrochemical performance of graphite anode for lithium-ion batteries.