Method for preparing nickel cobalt aluminum serving as cathodic material of lithium ion battery

Abstract

The invention discloses a method for preparing nickel cobalt aluminum serving as a cathodic material of a lithium ion battery, which comprises the following steps of: mixing nickel salt solution and cobalt salt solution uniformly, adding complexing agent solution, precipitant solution and the mixed solution into a reaction kettle with base solution in a parallel flow mode to perform precipitation reaction, performing solid-liquid separation after the reaction is performed fully, and washing; adding the washed solid material into the reaction kettle, dripping aluminum salt solution and the precipitant solution slowly to perform secondary precipitation reaction, so that an aluminum element is precipitated on the surface of the solid material gradually, stirring continuously in the integral process, performing solid-liquid separation after the reaction is finished, and washing and drying the solid material to a precursor of the cathodic material of the lithium ion battery; and mixing the precursor and a lithium source, performing two-section sintering under the condition of introducing oxygen, and crushing the calcined material which is subjected to the two-section sintering and performing subsequent processing to obtain the nickel cobalt aluminum serving as the cathodic material of the lithium ion battery. The method has the advantages of low requirement on equipment, high automation degree, environment friendliness, few wastes, high quality of products and the like and is easy to operate.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a battery, in particular to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Since Sony’s battery made of layered lithium cobalt oxide was put on the market in 1991, lithium-ion secondary batteries have increasingly played an important role in various fields, and battery materials have also continued to develop, and lithium-ion batteries with various characteristics have appeared one after another Battery cathode materials, such as lithium manganese oxide, lithium nickel oxide, lithium iron phosphate, nickel manganese cobalt ternary, etc. As people's requirements for lithium-ion batteries are getting higher and higher, people need lithium-ion secondary batteries with longer service life, smaller size and lighter weight, which requires their positive electrode materials to have good safety and specific capacity. ...

AI Technical Summary

Problems solved by technology

The solid-phase synthesis is generally sintered by mixing nickel compounds, lithium sources and doping element compounds, but this solid mixing method cannot achieve uniformity at the atomic level, and the performance is difficult to fully exert; although the liquid-phase method can solve this problem, But the process is complicated and the output is low

From the perspective of actual production, the preparation of lithium nickelate by the solid phase method is undoubtedly more suitable for large-scale production, but the production conditions are harsh and difficult to control, especially the strict requirements on the sintering atmosphere, because only Li can be obtained in the air atmosphere. 2 Ni 8-x m x o 10 In addition, the control of the sintering temperature is also a big problem, its floating range is narrow, the reaction is not sufficient if the temperature is low, and the decomposition will occur if the temperature is high, it is difficult to complete the reaction

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