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Preparation method for cobalt-nickel-manganese-lithium battery positive electrode material

A cathode material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex operation and poor repeatability, and achieve the effect of uniform particle size, uniform distribution, uniform mixing without dead ends

Inactive Publication Date: 2016-07-06
LIUZHOU KAITONG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation methods of nickel-cobalt-manganese-lithium cathode materials include high-temperature solid-phase method, coprecipitation method, sol-gel method, spray pyrolysis method, hydrothermal synthesis method and combustion method, etc., but coprecipitation method is still used more. This method is complicated to operate, has poor repeatability and requires strict control of experimental conditions, which limits the industrial production and practical application of nickel-cobalt-manganese-lithium cathode materials to a certain extent.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0021] A preparation method for a cobalt-nickel-manganese lithium battery cathode material, comprising the following steps:

[0022] (1) According to the stoichiometric ratio, the solid Mn(NO 3 ) 2 、CoCO 3 and Ni(NO 3 ) 2 ·6H 2 O mixing and ball milling. During ball milling, the ball mill adopts a rotating speed of 350-400r / min for ball milling, and the ball milling time is 45-60min, so that the ternary materials are initially mixed to obtain mixed particles.

[0023] (2) Then the above mixed particles and solid Li 2 CO 3 Mixing is put into the inner cavity of the rotating drum, specifically, the mixture is put into the inner cavity of the vertical drum rotating at high speed from top to bottom, and the vertical drum is used to facilitate the feeding and discharging; the rotating drum transfers the mixture from the Cavity throwing out, during the implementation process, the lower side wall of the drum is provided with several through holes along the circumference, so th...

Embodiment 1

[0029] Solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O was mixed and ball milled at a speed of 350r / min for 45min; then the above mixed particles and solid Li 2 CO 3 The mixture is poured into the inner chamber of the vertical drum rotating at high speed from top to bottom, and the high-speed rotating drum throws the mixture in the inner chamber out of the through hole of the lower side wall under the action of centrifugal force; the fan throws the mixture from bottom to top After blowing to the cylinder cover on the upper side of the drum, the mixture hits the cylinder cover and then puts it into the inner cavity of the drum again, and circulates like this; after about 10 minutes, put the mixture in a planetary ball mill and add an appropriate amount of absolute ethanol, and then use the pellet mass The ratio is 8:1, ball milling at a speed of 180 / min for 4.5 hours, and then the ball-milled slurry is dried in a drying oven at 60°C to obtain a precursor; the precursor is...

Embodiment 2

[0031] Solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O was mixed and ball milled at a speed of 380r / min for 60min; then the above mixed particles and solid Li 2 CO 3 The mixture is poured into the inner chamber of the vertical drum rotating at high speed from top to bottom, and the high-speed rotating drum throws the mixture in the inner chamber out of the through hole of the lower side wall under the action of centrifugal force; the fan throws the mixture from bottom to top After blowing to the cylinder cover on the upper side of the drum, the mixture hits the cylinder cover and then puts it into the inner cavity of the drum again, and circulates like this; after about 12 minutes, put the mixture in a planetary ball mill and add an appropriate amount of absolute ethanol, and then use the ball material The mass ratio is 9:1, ball milling at a speed of 200 / min for 4 hours, and then the ball-milled slurry is dried in a drying oven at 70°C to obtain a precursor; the precurs...

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Abstract

The invention relates to cobalt-nickel-manganese-lithium positive electrode material, and specifically to a preparation method for a cobalt-nickel-manganese-lithium battery positive electrode material. The preparation method comprises the steps of mixing solid Mn(NO<3>)<2>, CoCO<3> and Ni(NO<3>)<2>.6H<2>O based on chemometry, and performing ball milling on the mixture to obtain mixed particles; mixing the mixed particles with solid Li<2>CO<3>, and putting the mixture into an inner cavity of a rotary roller to throw out; then putting the thrown-out mixture into the inner cavity of the roller again to obtain a uniformly-mixed mixture; adding a dispersing agent and performing mechanical activation; then drying to obtain a precursor; performing pre-sintering on the precursor; then performing grinding after pre-sintering and then performing baking on the precursor to obtain the cobalt-nickel-manganese-lithium battery positive electrode material. According to the preparation method, a ternary material is subjected to ball milling by a ball milling machine initially, so that uniform particle size of the material is realized; irregular circulation movement of the mixed material is realized by centrifugal force and a fan, so that the purpose of uniformly mixing materials without dead corners is fulfilled; and then the cobalt-nickel-manganese-lithium battery positive electrode material with an excellent electrochemical performance is obtained by carrying out pre-sintering and baking.

Description

technical field [0001] The invention relates to a positive electrode material of a nickel-cobalt-manganese-lithium battery, in particular to a preparation method of a cobalt-nickel-manganese-lithium positive electrode material. Background technique [0002] In recent years, new lithium-ion composite cathode materials have developed rapidly, especially nickel-cobalt-manganese-lithium cathode materials, which have become a hot research topic for experts and scholars at home and abroad. with commercial LiCoO 2 Compared with the nickel-cobalt-manganese-lithium cathode material, it has the advantage of low cost; compared with LiNiO 2 Compared with nickel-cobalt-manganese-lithium cathode materials, it is easier to synthesize, and the cycle performance and thermal stability are relatively good; compared with spinel LiMn 2 o 4 Generally speaking, the nickel-cobalt-manganese-lithium cathode material has a more stable structure during charge and discharge, and the Jahn-Teller effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/36
CPCH01M4/36H01M4/525Y02E60/10
Inventor 黎超英吴沛荣
Owner LIUZHOU KAITONG NEW MATERIAL TECH CO LTD
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