High nickel ternary lithium ion battery anode slurry and preparation method thereof

Abstract

The invention discloses a high nickel ternary lithium ion battery anode slurry and a preparation method thereof. The anode slurry comprises the following raw materials in parts by weight: 89.5 to 97.9 parts of high nickel ternary anode powder, 1 to 5 parts of conductive agent, and 1 to 5 parts of adhesive, and also comprises mixed additives accounting for 0.1 to 0.5% of the weight of all solid powder and a proper amount of solvent, wherein the mixed additives comprise dispersed additives and acidic buffering type additives, and due to the solvent, the solid content of the anode slurry is in a range of 60 to 85%. Through the mixed additive, the acid / alkali property of the surface of the high nickel ternary anode powder is improved, the dispersing force of the anode powder is enhanced, the using amount of the solvent is reduced, and the slurry production time is reduced. At the same time, the problem that the slurry becomes thick due to the change of pH value of the slurry surface after being contacted with the environment during the preparation process is solved, and the obtained anode slurry is uniform and is good in flowing property.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-nickel ternary lithium-ion battery cathode slurry and a preparation method thereof. Background technique [0002] At present, the market prospect of power lithium-ion batteries for electric vehicles is broad, and ternary power batteries with high energy density are increasingly recognized by various car manufacturers and battery manufacturers, and the demand is large. In order to ensure long battery life, ternary power batteries are also constantly developing in the direction of high nickel. Here, high nickel refers to the increasing Ni content in the ternary materials used. Common high-nickel ternary materials include NCM811, NCA, etc. [0003] In order to obtain a lithium-ion battery with higher energy density, the proportion of active materials in the positive electrode sheet is gradually increased, and the amount of conductive agent and binder used is dec...

AI Technical Summary

Problems solved by technology

At the same time, for high-nickel ternary materials, there is residual alkali on the surface. When a conductive agent with small particles is selected, the water absorption capacity of the powder becomes stronger, and the slurry is more likely to jelly, which further increases the difficulty of homogenization.