Nickel-cobalt-lithium manganese positive electrode material with boron-lithium composite oxide clad on surface, and preparation method thereof

A composite oxide, nickel cobalt lithium manganese oxide technology, applied in battery electrodes, electrochemical generators, electrical components and other directions, can solve problems such as poor cycle stability, and achieve low cost, good coating effect, and improved cycle performance. Effect

Inactive Publication Date: 2015-02-04
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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AI Technical Summary

Problems solved by technology

One of the problems to be solved urgently is its poor cycle stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: A kind of preparation method of the nickel-cobalt-lithium-manganese oxide cathode material coated with boron-lithium composite oxide on the surface is completed according to the following steps:

[0020] 1. take lithium citrate and diboron trioxide respectively by stoichiometric ratio, under stirring condition, be mixed with dehydrated alcohol to make the mixed solution of Li:B=2:1;

[0021] ②Based on the mass ratio of LiNi x co 1-x-y mn y o 2 :α-Li 4 B 2 o 5 = 1:0.06 ratio Weigh the positive electrode material, add the positive electrode material to the mixed solution obtained in step ①, and ultrasonically 1.1h until the dispersion is uniform to obtain a suspension;

[0022] ③Under stirring conditions, slowly add dispersant hydroxyethyl cellulose to the suspension obtained in step ② until the system is viscous, and the dispersant is 9% of the suspension mass;

[0023] ④ Place the viscous substance obtained in step ③ in an oven, dry and evaporate to...

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Abstract

The invention relates to a nickel-cobalt-lithium manganese positive electrode material with a boron-lithium composite oxide clad on the surface. According to the invention, a layer of boron-lithium composite oxide is clad on the surface of a nickel-cobalt-lithium manganese positive electrode material. The preparation method of the material comprises the steps that: in a mixed alcohol solution of a lithium source and a boron source, prepared nickel-cobalt-lithium manganese is added and is uniformly dispersed in the solution through ultrasonic treatment; a dispersing agent is added, such that the material is sufficiently soaked in the solution; a solvent is removed by evaporation, and a heat treatment is carried out, such that LiNixCo1-x-yMnyO2 with alpha- Li4B2O5 clad on the surface is obtained. According to the invention, horizontal contact of the cladding material and positive electrode material molecules is realized, and clad layer thickness is uniform. Also, the boron-lithium composite oxide is clad on the surface of the positive electrode material, such that lithium ion diffusion coefficient is improved, and material ionic conductivity is enhanced. Also, direct contact of an electrolyte and the positive electrode material is effectively avoided, such that electrode side reaction is avoided, and positive electrode material chemical stability and circulation performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a nickel-cobalt lithium manganese oxide positive electrode material with a surface coated with boron-lithium composite oxide and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, and electrolytes. Among them, the high price and low reversible specific capacity of cathode materials have become an important bottleneck restricting the development of lithium-ion batteries. Therefore, finding high-quality and low-cost cathode materials is the main direction for the development of lithium-ion batteries in the future. [0003] Layered nickel-cobalt lithium manganate cathode material (LiNi x co 1-x-y mn y o 2 ), due to the synergistic effect of nickel, cobalt and manganese, it has the advantages of high energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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