High practicality lithium nickel manganese oxide and preparation method thereof

Abstract

The invention discloses a high practicality lithium nickel manganese oxide and a preparation method thereof. The lithium nickel manganese oxide is characterized in that manganese source, lithium source, nickel source and a certain amount of grinding aid are blended by a dry grinding mode, the lithium nickel manganese oxide material with low specific surface area is prepared by using the characteristics of slow crystal nucleation rate and little nucleation of a precursor, contact area of the material and an electrolyte is increased, cycle life of the material is increased; cation disorder degree and crystal structure dislocation of the crystal can be controlled through a multi-step calcining technology for guaranteeing the multiplying power performance of the material; the obtained lithium nickel manganese oxide coats the surface of a carbon layer by using a vapour deposition method, anchoring strength of the material and a current collector is enhanced, peeling intensity of pole sheet is enhanced, material processing property is ensured, and multiplying power performance is increased. The material has the advantages of long service life and good processing property, and is the lithium nickel manganese oxide material with high practicality, the preparation method is economic and easy to operate, and is suitable for commercialization popularization.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion power batteries, in particular to a lithium nickel manganese oxide material with long cycle life and good processability, and a method for preparing the material by combining a solid phase reaction method and a chemical vapor deposition method. Background technique [0002] A few days ago, with the vigorous promotion of lithium-ion battery electric vehicles, the market's requirements for corresponding lithium-ion batteries are also getting higher and higher. Different from the battery standards for consumer electronics such as mobile phones, the field of power batteries has higher requirements on the energy density and rate performance of materials. The voltage platform of lithium nickel manganese oxide as high as 4.7V and the three-dimensional lithium ion diffusion channel make it have nearly 30% higher energy density and better rate performance than the current markete...

AI Technical Summary

Problems solved by technology

However, the current limiting factors for the promotion of this material to the market are: 1) The decomposition of the electrolyte under high voltage causes the cycle performance of the material to fail to meet commercial requirements;

[0003] 2) Lithium nickel manganese oxide materials obtained by many modification methods reported publicly at present, although the electrochemical performance of the material has been improved, but there are also problems such as poor processing performance, which seriously affects the preparation of full batteries

In this method, since the oxide as the surface coating agent is added together with the reaction raw materials, the surface coating agent is easily doped into the system and cannot be effectively coated. On the other hand, the used melting agent may decompose and bring The corresponding environmental pressure may cause residues in the system to introduce impurity phases to cause elution problems