Preparation method of stable slurry of lithium ion battery

The invention discloses a preparation method of stable slurry of a lithium ion battery. The preparation method comprises the steps of: preparing mixed material and glue from an active substance, a conductive agent, a bonding agent, a dispersing agent, a solvent and other additives by a few steps of dry mixing, wet mixing and glue preparation, and then subjecting the mixed material and the glue to wet mixing by a stirrer to obtain mixed slurry, and further comprises the steps of: (1) dispersing the mixed slurry for 10 to 20 minutes by a high speed dispersing machine of 15 to 50m/s, and storing the slurry in a storage tank upon the completion of the dispersion; (2) returning the slurry in the storage tank to the stirrer and then dispersing the slurry for 10 to 20 minutes by the high speed dispersing machine according to the step (1); (3) circularly repeating the step (1) and the step (2) 2 to 5 times; and (4) after the dispersion is completed, performing defoaming, filtration and iron impurity removal on the slurry based on the prior art to obtain the finished product. The slurry in the invention is homogeneous in dispersion and can be stable for a long time; and compared with the traditional way that the stirrer is used to stir for a quite long time, the method can shorten the time for slurry preparation greatly and is favorable for automatic continuous production.