Preparation method of nano positive material for lithium ion battery

Abstract

The invention belongs to the field of preparation techniques of nanophase materials and green energy resources, and relates to a preparation method of a nano positive material LiNi1 / 3Mn1 / 3Co1 / 3O2 applied to a lithium ion battery. By using the method, the defects that the calcining temperature needed by a current synthetic material is high, the calcining time is long, the particle sizes of a product are not uniform, and the like, are mainly solved. The preparation method comprises the following steps: adding a certain amount of template agent in a mixed aqueous solution of a nickel salt, a manganese salt and a cobalt salt, and then, dripping a precipitant and a complexing agent into the obtained mixture to form a precipitate; subjecting the precipitate and the mixed aqueous solution to a high-pressure thermal reaction in a hydrothermal kettle, cleaning and baking the obtained product to be dry, so as to obtain a nickel manganese cobalt oxide; and finally, uniformly mixing the nickel manganese cobalt oxide with the lithium salt to prepare a final product by calcining and cooling. By using the preparation method, the product with favorable electrochemical performance can be obtained within a shorter calcining time; the energy consumption is decreased; and the preparation method has obvious economic benefit in the large-scale application of industrial synthesis.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation technology and green energy, and relates to a nanoscale positive electrode material LiNi applied to lithium ion batteries 1 / 3 mn 1 / 3 co 1 / 3 o 2 method of preparation. Background technique [0002] The two major tasks of lithium-ion battery research are to improve performance (mainly high energy density and power density, long life, safety) and reduce cost. The cathode material is the key to improving the performance of lithium-ion batteries, which determines the main performance indicators of lithium-ion batteries. In terms of positive electrode materials in power lithium-ion secondary batteries, lithium cobalt oxide (LiCoO 2 ) There are problems such as thermal runaway risk and high cost of large batteries; lithium manganate (LiMn 2 o 4 ) has the advantages of low cost, environmental friendliness, and high safety, but it has low energy density, poor cycle performance, and prominent ...

AI Technical Summary

Problems solved by technology

[0003] Although LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 The material has broad development prospects, but its preparation process is complex and not suitable for industrial production, which limits its practical application

The commonly used solid-phase synthesis method has simple operation steps, but the energy consumption is large, the reaction time is long, and the heterogeneity of the synthesized material components is not enough; although liquid-phase methods such as sol-gel method and precipitation method can synthesize components with uniform However, the calcination temperature of heat treatment is very high (over 900 ℃), and the calcination time is long, which makes the energy consumption of the preparation material large

At the same time, the low conductivity of the cathode material seriously affects its electrochemical performance under high current.

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