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Preparation method of co-doped ternary positive electrode material

A positive electrode material and co-doping technology, applied in the field of preparation of lithium ion positive electrode materials, can solve the problems of poor electrochemical performance and stability of materials, irreversible phase transition, etc., to reduce technical costs, improve structural stability, and improve cycle The effect of stability

Inactive Publication Date: 2020-12-25
冯芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly aims at the irreversible phase transition of the ternary positive electrode material during the ion doping process, and the poor electrochemical performance and stability of the material due to ion mixing. Therefore, the present invention proposes a co-doped ternary positive electrode material. Preparation

Method used

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  • Preparation method of co-doped ternary positive electrode material
  • Preparation method of co-doped ternary positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for preparing a co-doped ternary positive electrode material, the specific steps are as follows:

[0033] S1: Mix nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio Ni:Co:Mn=8:1:1 and add them to the deionized water, configure the concentration of the salt solution to be 2mol / L, and then add an equal volume ratio of 4mol / L 1 L of sodium hydroxide solution, then add 5 mol / L of ammonia water bottom solution, react in the reactor for 12 hours, filter the liquid with a suction filter, take the filter residue and put it in a drying box, dry it at 110 ° C for 12 hours, and obtain the precursor ( Ni 0.8 mn 0.1 co 0.1 o 2 )OH 2 .

[0034] S2: the precursor (Ni 0.8 mn 0.1 co 0.1 o 2 )OH 2 Grind with a mortar first, and then use a ball mill for secondary grinding. The grinding time is 4 hours, and then pass the precursor powder through a 200-mesh sieve to obtain the required precursor material.

[0035] S3: the precursor powder m...

Embodiment 2

[0039] A method for preparing a co-doped ternary positive electrode material, the specific steps are as follows:

[0040] S1: Mix nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio Ni:Co:Mn=8:1:1 and add them to the deionized water, configure the concentration of the salt solution to be 2mol / L, and then add an equal volume ratio of 4mol / L 1 L of sodium hydroxide solution, then add 5 mol / L of ammonia water bottom solution, react in the reactor for 12 hours, filter the liquid with a suction filter, take the filter residue and put it in a drying box, dry it at 110 ° C for 12 hours, and obtain the precursor ( Ni 0.8 mn 0.1 co 0.1 o 2 )OH 2 .

[0041] S2: the precursor (Ni 0.8 mn 0.1 co 0.1 o 2 )OH 2 Grind with a mortar first, and then use a ball mill for secondary grinding. The grinding time is 4 hours, and then pass the precursor powder through a 200-mesh sieve to obtain the required precursor material.

[0042] S3: the precursor powder m...

Embodiment 3

[0046] A method for preparing a co-doped ternary positive electrode material, the specific steps are as follows:

[0047] S1: Mix nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio Ni:Co:Mn=8:1:1 and add them to the deionized water, configure the concentration of the salt solution to be 2mol / L, and then add an equal volume ratio of 4mol / L 1 L of sodium hydroxide solution, then add 5 mol / L of ammonia water bottom solution, react in the reactor for 12 hours, filter the liquid with a suction filter, take the filter residue and put it in a drying box, dry it at 110 ° C for 12 hours, and obtain the precursor ( Ni 0.8 mn 0.1 co 0.1 o 2 )OH 2 .

[0048] S2: the precursor (Ni 0.8 mn 0.1 co 0.1 o 2 )OH 2 Grind with a mortar first, and then use a ball mill for secondary grinding. The grinding time is 4 hours, and then pass the precursor powder through a 200-mesh sieve to obtain the required precursor material.

[0049] S3: the precursor powder m...

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Abstract

The invention aims to provide a preparation method of a co-doped ternary positive electrode material. The preparation method mainly adopts a NMC ternary positive electrode material co-doped by multiple ions such as an anion F- and cations Mg<2+> and Na<+>. The preparation method mainly comprises the steps of mixing a nickel salt, a cobalt salts and a manganese salt, which are soluble, according toa certain chemical ratio, and preparing a precursor (Ni0.8Mn0.1Co0.1O2)OH2 by using a coprecipitation method; mixing the precursor (Ni0.8Mn0.1Co0.1O2)OH2 and LiOH.H2O according to a certain chemicalratio, and grinding the mixture; dissolving a certain amount of NH4F and Mg(NO3)2.6H2O into absolute ethyl alcohol, adding the ground (Ni0.8Mn0.1Co0.1O2)OH2 and LiOH.H2O, stirring at the temperature of 85 DEG C until the ethyl alcohol is completely evaporated, adding a certain amount of sodium chloride, uniformly mixing, putting into a tube furnace, and calcining at high temperature to obtain theco-doped ternary positive electrode material. The co-doped ternary positive electrode material prepared by the invention improves the structural stability of high-current charging and discharging performance.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion positive electrode materials, and in particular relates to a preparation method of co-doped ternary positive electrode materials. Background technique [0002] In recent years, the country has vigorously developed the new energy automobile industry, and the power battery as its core component has become the biggest driving factor for the lithium-ion battery industry. The main reasons currently restricting the marketization of new energy vehicles are the high cost of power batteries and insufficient battery life. Therefore, the development of cheap and efficient batteries is the top priority for the commercialization of electric vehicles. [0003] Cathode materials are the bottleneck for the improvement of energy density and price reduction of lithium-ion batteries. Its development dominates the development direction of the power battery industry. At present, the cathode materials for comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/006C01P2006/40H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 冯芳
Owner 冯芳
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