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A lithium-ion battery nickel-cobalt lithium manganate positive electrode material and preparation method thereof

A technology for nickel-cobalt lithium manganate and lithium-ion batteries, which is applied in the field of lithium-ion battery nickel-cobalt lithium manganate cathode materials and their preparation, can solve the problems of irregular particle shape and uneven size, and achieve uniform morphology and size. Uniform, regular shape effect

Active Publication Date: 2017-07-11
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: the particle shape and size of the nickel-cobalt lithium manganate positive electrode material obtained by the existing method for preparing nickel-cobalt lithium manganese oxide positive electrode material Uniform

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  • A lithium-ion battery nickel-cobalt lithium manganate positive electrode material and preparation method thereof

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preparation example Construction

[0031] The first aspect of the present invention provides a method for preparing a lithium-ion battery nickel-cobalt-lithium manganese oxide positive electrode material, the preparation method comprising the following steps:

[0032] Step 1, dissolving lithium salt, nickel salt, cobalt salt and manganese salt in a solvent according to the ratio of the amount of substances Li:Ni:Co:Mn=(1.01~1.1):x:y:(1-x-y) to obtain The first solution, where 0<x<1, 0<y<1;

[0033] Step 2, adding a chelating agent and a carbon source to the first solution, and mixing uniformly to obtain a second solution; wherein, the ratio of the amount of substances of the chelating agent to the total amount of metal ions in the first solution 1:1~1.2:1;

[0034] Step 3, heating the second solution for 8-12 hours under the condition of vacuum degree of -0.1-0.08MPa and temperature of 80-120°C, and removing the solvent in the second solution to obtain the precursor powder;

[0035] Step 4, in an inert gas at...

Embodiment 1

[0052] An embodiment of the present invention provides a method for preparing a positive electrode material of lithium nickel cobalt manganese oxide, wherein the chemical formula of lithium nickel cobalt manganese oxide is: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the amount of carbon coating (carbon accounts for the mass percent of carbon-coated nickel-cobalt-lithium manganese oxide positive electrode material, the same below) is 0.5%, and the steps of the preparation method are as follows:

[0053] Step 1, accurately weigh lithium acetate, nickel acetate, cobalt acetate and manganese acetate according to the ratio of the substance ratio Li:Ni:Co:Mn=1.04:1 / 3:1 / 3:1 / 3, dissolve in deionized Obtain the first solution after water, wherein, the total substance concentration of metal ion is 1mol / L;

[0054] Step 2, adding chelating agent citric acid and carbon source glucose to the first solution, stirring magnetically for 1 hour to mix citric acid and glucose with the first solution to obt...

Embodiment 2

[0060] An embodiment of the present invention provides a method for preparing a positive electrode material of lithium nickel cobalt manganese oxide, wherein the chemical formula of lithium nickel cobalt manganese oxide is: LiNi 0.4 co 0.5 mn 0.1 o 2 , the carbon coating amount is 0.1%, and the steps of the preparation method are as follows:

[0061] Step 1, accurately weigh lithium nitrate, nickel nitrate, cobalt chloride and manganese chloride according to the ratio of the amount of substances Li:Ni:Co:Mn=1.01:0.4:0.5:0.1, and dissolve them in deionized water to obtain the first A solution, wherein the total substance concentration of metal ions is 0.5mol / L;

[0062] Step 2, adding chelating agent triethanolamine and carbon source phenolic resin to the first solution, magnetically stirring for 1 hour to mix triethanolamine and phenolic resin with the first solution to obtain a second solution; wherein, the amount of triethanolamine The ratio with the total amount of meta...

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Abstract

The invention discloses a lithium-ion battery nickel-cobalt-lithium-manganese-oxide positive electrode material and a preparation method thereof, belonging to the technical field of preparation of lithium-ion battery positive electrode materials. The preparation method comprises the following steps: 1, lithium salt, nickel salt, cobalt salt And dissolving the manganese salt in a solvent to obtain a first solution, wherein 0<x<1, 0<y<1; 2, adding a chelating agent and a carbon source to the first solution, and mixing them uniformly to obtain a second solution; 3 , to obtain the precursor powder after removing the solvent in the second solution; 4. In an inert gas atmosphere, first heat the precursor powder at a temperature of 300-400° C. for 0.5-2 hours, and then use infrared light to As a heat source, the temperature of the precursor powder is raised to 800-900° C., and the temperature is kept for 3-4 hours; after cooling, the lithium-ion battery nickel-cobalt-lithium-manganese-oxide cathode material is obtained. The obtained nickel-cobalt lithium manganese oxide cathode material has regular shape and uniform size; meanwhile, heating time is shortened, energy is saved, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a lithium ion battery nickel cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] As a high-energy storage battery, lithium-ion batteries have the advantages of high energy density, long service life, good cycle performance and no memory effect. Lithium-ion battery cathode material is an important part of lithium-ion batteries, and it has an important impact on the electrochemical performance of lithium-ion batteries. Common cathode materials for lithium-ion batteries can no longer meet people's needs for high-capacity, high-energy-density electronic products. Currently commercial lithium-ion batteries mainly use LiCoO 2 As a cathode material, due to the scarcity of cobalt resources, high cost, environmental pollution and poor anti-overcharge abili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/04H01M4/62
CPCH01M4/0471H01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M4/62H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 朱广燕刘三兵梅周盛海滨
Owner CHERY AUTOMOBILE CO LTD
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