Preparation method of lithium ion battery positive electrode material

Abstract

The invention discloses a preparation method of a lithium ion battery positive electrode material. The method is characterized in that a mixture of lithium nitrate and lithium hydroxide acts as a lithium source and also acts as a solvent, so that a lithium source and a cobalt source are subjected to solid-liquid mixing and react nearby a lithium source eutectic point, so that the diffusion path of an ion is shortened, the thermal treatment temperature is lowered and the forging time is shortened, and finally the lithium ion battery positive electrode material with excellent electrochemical performance is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] With the shortage of fossil energy and the development of industrialization, the pressure of energy shortage and environmental pollution is becoming more and more serious. It is imperative to find clean energy and develop new energy-saving preparation methods. [0003] As a new type of green energy, lithium-ion batteries are widely used in portable electronic devices such as mobile phones, digital cameras, and notebook computers. Among them, the positive electrode material is the most critical part affecting the performance of lithium-ion batteries, and its cost is the highest among lithium-ion batteries. Therefore, improving the performance of the positive electrode material and reducing the cost of the positive electrode material are the key links to impro...

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Problems solved by technology

[0006] Due to the simple preparation process of the solid-phase synthesis method, wide source of raw materials, low cost, and low requirements for equipment, the industrial synthesis of lithium-ion battery cathode materials usually uses the solid-phase synthesis method, but compared with the liquid-phase method, high temperature In the solid-phase method, the mixing uniformity of the raw materials is low, and the ion diffusion rate between the solid-solid phase is slow, which requires a long time (10-30h) of high-temperature calcination, so the energy consumption is large; while the product produced by the liquid-phase method has high chemical purity. , good uniformity, and its heat treatment temperature is low, and the reaction time is short, but it needs to add a large amount of organic compounds in the synthesis process, which will increase the production cost

[0007] At present, there is a preparation method using low-temperature molten salt as a reaction medium in the prior art, such as Chinese patent CN102324504B, which discloses a lithium-ion battery positive electrode material coated with lithium cobaltate on the surface and a preparation method thereof. The method uses lithium cobaltate The compound is used as the matrix, the mixture of one or more of alkali metals and alkaline earth metal halides, nitrates, and sulfates is used as the melting medium, and other compounds are used as coatings to modify lithium cobaltate. The method requires additional molten salt to be added to the reaction system, which inevitably leaves residues in the product and adversely affects the performance of the final product

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