Method for preparing ternary precursor of lithium battery by cyclic electrolysis

Abstract

The invention discloses a method for preparing a ternary precursor of a lithium battery by cyclic electrolysis. The method comprises the steps that (1) an active metal salt solution is mixed with an anion polymerization agent to acquire an electrolyte; (2) the electrolyte is electrolyzed through three-chamber membrane electrolysis reaction; and (3) an acid-soluble nickel-cobalt-manganese mixture is mixed with an acid solution acquired by electrolysis in the step (2) to acquire a mixed liquid; and the mixed liquid is added to an alkali chamber during electrolysis, and stirring and mixing are carried out at a rate of 50 to 300 r / min; and (4) the product acquired in the alkali chamber in the step (3) is filtered, and the solid phase product is washed, and then dried under vacuum at 60 to 120DEG C until the water content in the solid phase product is 0.1 to 0.5%, so as to acquire the lithium battery ternary precursor. According to the invention, in the reaction process adding an additional addition agent, an antioxidant, a dispersant and the like is not needed, so that the reaction control is greatly simplified, and the production cost is reduced; and the prepared ternary precursor have better performance indexes than a conventional coprecipitation method.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method for preparing a lithium battery ternary precursor by cyclic electrolysis. Background technique [0002] Benefiting from the promotion of the new energy vehicle industry policy, China is already the world's largest electric vehicle market. The automotive lithium-ion power battery market is coming out of the introduction period and entering a period of rapid growth. In the next few years, the largest driving force for the growth of the lithium-ion battery market will undoubtedly come from the electric vehicle market. The global production of lithium-ion power batteries and their materials is mainly concentrated in China, Japan and South Korea. The main cathode materials include modified lithium manganate, nickel-cobalt lithium manganate or nickel-cobalt lithium aluminate. The demand for high-energy-density lithium-ion power batteries drives the appl...

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Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for preparing a ternary precursor of a lithium battery by cyclic electrolysis, which can effectively solve the need for the existing process to add complexing agents, antioxidants, and dispersants. and poor performance consistency, high production costs, and the production of a large amount of waste water containing nickel, cobalt and manganese

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