Conductive carbon black has always been an important additive for the positive electrode plate of lithium-ion batteries.Its function is to improve the electron transfer between the positive electrode electroactive material coating and the current collector,reduce the interface contact resistance of the motor,and have a depolarization effect.If solvent based binders are used to prepare lithium-ion battery electrodes,lipophilic conductive carbon black can be easily uniformly dispersed in the cathode material coating.At present,the solvent binder mainly used in the manufacturing process of lithium-ion batteries is the PVdF methylpyrrolidone system,which has been classified as a third class toxic chemical in European countries.The allowable concentration discharged into the air mass is only 100mg/m,which not only causes serious pollution to the environment,but also poses a certain risk to the health of operators.
We believe that using water-based binders to prepare lithium-ion battery electrodes can not only solve environmental pollution and protect the health of operators,but also be a good energy-saving and emission reducing battery production technology.Conductive carbon black is an oleophilic carbon material,and water-based binders are used to prepare battery electrodes.Conductive carbon black slurry has poor dispersibility and is prone to forming agglomerated particles.In order to solve its dispersion problem in aqueous slurries,we conducted some experiments by oxidizing conductive carbon black with hydrogen peroxide to improve its hydrophilicity,and further analyzed its impact on the cycling characteristics of lithium-ion battery performance.

Finally, we found that in the adhesive system using the motor as the water-based adhesive, the conductive carbon black treated with hydrogen peroxide significantly reduced the rate of internal resistance change during battery cycling and improved the battery's cycle life. Under 1C charging/2C battery cycle life measurement conditions, it increased by 47.1%. The effect of surface modified conductive carbon black on improving cycle life is due to the improved bonding state between the conductive agent and the cathode material.
Editor: Miranda