▎ 摘　　要

NOVELTY - Energy storage device (100) comprises current collector coated with electroconductive slurry (105a), where electroconductive slurry is prepared by (i) providing a first mixture comprising a first binder and a conductive additive in a first solvent; (ii) adding an active material and a second solvent to the first mixture with constant stirring to form a final mixture, where adding the active material to the first mixture comprises adding sequentially a portion of the active material in a set of batches; (iii) admixing a second binder with the final mixture to form the electroconductive slurry; and providing an acid solution to maintain a pH of the electroconductive slurry in a defined range, where acid solution is added (a) to the first mixture after step (i) and before step (ii), or (b) to the final mixture after step (ii) and before step (iii). USE - Energy storage device used for preparing electroconductive slurry (claimed) for electrode. ADVANTAGE - The energy storage device is non-toxic, cheap, and eco-friendly slurry methods and materials, and enhances slurry performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) method of preparing an energy storage device comprising a current collector, which involves (i) providing a first mixture comprising a first binder and a conductive additive in a first solvent; (ii) adding an active material and a second solvent to the first mixture with constant stirring to form a final mixture, where adding the active material to the first mixture comprises adding sequentially a portion of the active material in a plurality of batches; (iii) admixing a second binder with the final mixture to form the electroconductive slurry; providing an acid solution to maintain a pH of the electroconductive slurry in a defined range, where acid solution is added (a) to the first mixture after step (i) and before step (ii), or (b) to the final mixture after step (ii) and before step (iii); and (iv) coating the electroconductive slurry on the current collector; and (2) method for preparing an electroconductive slurry. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of an energy storage device. 100Energy storage device 102Cathode current collector 104Anode current collector 105aElectroconductive slurry 106Cathode