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Preparation method for lithium nickel manganese cobalt positive electrode material

A technology of nickel cobalt lithium manganate and cathode material, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor repeatability and complicated operation, and achieve the effect of excellent electrochemical performance

Inactive Publication Date: 2016-08-17
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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method of nickel cobalt lithium manganese oxide cathode material, it comprises the following steps:

[0019] (1) According to the stoichiometric ratio, the solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 The mixture 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 under the action of centrifugal force. Throwing out from the inner cavity, during the implementation process, the lower side wall of the drum is provided with several through holes along the circumference, so that the high-speed rotating drum can throw the mixture in the inner cavity out of the through holes in the lower side wall under the action of centrifugal force The mixture thrown out is dropped into the inner cavity of the drum again, as...

Embodiment 1

[0024] Solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 The mixture is poured into the inner chamber of the high-speed rotating vertical drum from top to bottom, and the high-speed rotating drum throws the mixture in the inner chamber from the through hole of the lower side wall under the centrifugal force; After blowing up 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 ball mill and add an appropriate amount of absolute ethanol, and then use 350 / min The speed of ball milling was 60min, and then the slurry after ball milling was dried in a drying oven at 60°C to obtain a precursor; the precursor was pre-calcined at a temperature of 450°C for 5 hours; after pre-calcination, it was ground, Calcining again, the temperature of calcination is 800° C., and the time of calcination is 10 hours, to...

Embodiment 2

[0026] Solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 The mixture is poured into the inner chamber of the high-speed rotating vertical drum from top to bottom, and the high-speed rotating drum throws the mixture in the inner chamber from the through hole of the lower side wall under the centrifugal force; After blowing up 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 15 minutes, put the mixture in a ball mill and add an appropriate amount of absolute ethanol, and then use 380 / min The speed of ball milling was 50 minutes, and then the slurry after ball milling was dried in a drying oven at 70°C to obtain a precursor; the precursor was pre-calcined at a temperature of 500°C for 4.5 hours; after pre-calcination, it was ground , and then roasted at a temperature of 850° C. for 9.5 hours to obtain a positive electrode mater...

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Abstract

The invention relates to a lithium nickel manganese cobalt positive electrode material, in particular to a preparation method of the lithium nickel manganese cobalt positive electrode material. The preparation method comprises the following steps of throwing a mixture of solid-state Mn(NO<3>)<2>, CoCO<3>, Ni(NO<3>)<2>.6H<2>O and Li<2>CO<3> into an inner cavity of a rotating roller according to stiochiometric ratio; throwing the mixture out of the inner cavity by the rotating roller under the effect of a centrifugal force, and throwing the mixture into the inner cavity of the roller again; circulating the steps to obtain the uniformly-mixed mixture; adding a dispersing agent into the above uniformly-mixed mixture for ball milling; placing the paste after ball milling in a drying box for drying to obtain a precursor; pre-sintering the precursor; and grinding the precursor after pre-sintering, and roasting the precursor to obtain the lithium nickel manganese cobalt positive electrode material. Irregular circulation movement of the mixture material is achieved by the centrifugal force and a fan, so that the purposes of uniformity and no dead angle of the mixed material are achieved, and then the lithium nickel manganese cobalt positive electrode material with excellent electrochemical performance is obtained by pre-sintering and roasting.

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 nickel-cobalt-manganese lithium manganese oxide 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 J...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 黎超英吴沛荣
Owner LIUZHOU KAITONG NEW MATERIAL TECH CO LTD
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