Lithium ion battery positive electrode material aluminum-titanium coating preparation method

Abstract

The invention discloses a lithium ion battery positive electrode material aluminum-titanium coating preparation method comprising the steps that: nickel salt, manganese salt, a cobalt salt solution and a sodium hydroxide solution containing ammonia water are introduced into a reaction container, and a precipitation reaction is carried out; a hydroxide precursor M containing nickel-manganese-cobalt and lithium salt are mixed according to a molar ratio of 1.0-1.2; the mixture is calcined, cooled, crushed, and sieved, such that the lithium ion battery positive electrode material is obtained; the obtained material is prepared into slurry and is introduced into a well dispersed mixed solution of alumina and titania, and a reaction is carried out; the material obtained after the reaction is subjected to solid-liquid separation, and is washed by using deionized water; and bake-drying and sintering are carried out, such that an aluminum-titanium-coated lithium ion battery positive electrode material is obtained. With the method disclosed by the invention, high-manganese ternary positive electrode material processing performance and tap density are improved, and material capacity and stability defects are overcome. Through controlling precursor morphology and particle size, physiochemical performances of the high-manganese ternary positive electrode material can be controlled, and material stability is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a method for preparing aluminum-titanium-coated positive electrode materials of lithium-ion batteries. Background technique [0002] In today's society, digital products such as mobile devices and personal computers are used more and more widely, and the demand for small, light-weight secondary batteries with high energy density is increasing as a power source for driving these devices. Under such circumstances, lithium-ion batteries with high charge and discharge voltage and large charge and discharge capacity have attracted attention. [0003] Lithium-ion batteries, which are widely used at present, are undergoing continuous updating and improvement of cathode materials. There are many systems of cathode materials for lithium-ion batteries. At present, the layered lithium cobalt oxide series LiCoO2, the layered lithium nickel oxide serie...

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Problems solved by technology

The disadvantages of this method are: first, the solid phase diffusion speed is slow, the mixing is difficult to be uniform, and there are large differences in the structure and composition of the product, which makes its electrochemical performance difficult to control; second, the bulk density of the synthesized powder material Low, the tap density generally achieved is only 1.6~1.8g / cm3, so that the volume specific capacity of lithium nickel cobalt manganese oxide is much lower than that of lithium cobalt oxide, so its practical application is limited. Influence

[0005] The positive electrode material obtained by the above co-precipitation method is suitable for general batteries. For power batteries, the high temperature safety performance and cycle performance are not very good

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