Aqueous polyimide binding agent of lithium battery positive electrode material and preparation method of aqueous polyimide binding agent

The invention discloses an aqueous polyimide binding agent of a lithium battery positive electrode material and a preparation method of the aqueous polyimide binding agent. The preparation method comprises the steps of (1) adding a reaction product into a reaction kettle under inert atmosphere, and rising a temperature until a solid is completely dissolved; (2) adding a catalyst, rising the temperature until no carbon dioxide is discharged, performing cooling, and adding a solvent after weighing; (3) filtering to obtain a filter liquid; (4) weighing the solution obtained in the step (3), dropwise adding a lithium dodecyl sulfate solution, and performing stirring and mixing; (5) rising the temperature of the mixed liquid obtained in the step (4) to 65-85 DEG C, and dropwise adding deionizedwater; (6) weighing the mixed liquid obtained in the step (5), adding the deionized water; and (7) weighing the solution obtained in the step (6), ferrous phosphate and graphene, sequentially addingthe ferrous phosphate and