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Method for preparing small-size nickel-cobalt lithium manganate precursor

A technology for nickel-cobalt lithium manganate and nickel-cobalt lithium manganate, which is applied in the field of preparation of small-sized nickel-cobalt lithium manganate precursors, can solve the problem of harsh requirements on raw materials and equipment, difficult to control product morphology, and unsuitable for industrialized production, etc. problems, to achieve the effect of convenient equipment requirements, regular morphology and good dispersion

Active Publication Date: 2013-08-21
宁夏中色金辉新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material elements synthesized by this method have good distribution uniformity, small particle size, even reaching nanometer scale, but the shape of the product is not easy to control, and it is mostly used in laboratory research, and it is difficult to scale up and produce industrially.
[0008] The spray method can be divided into spray drying method and spray decomposition method. The basic principle is to spray the metal salt solution into a hot environment to make it dry or decompose to obtain spherical particles with a small particle size. , but the requirements for raw materials and equipment are more stringent, so it is not suitable for industrial production

Method used

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  • Method for preparing small-size nickel-cobalt lithium manganate precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of preparation method of precursor of nickel cobalt lithium manganese oxide of small particle size comprises the following steps:

[0031] (1) Use the soluble salts of nickel, cobalt, and manganese nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials, prepare the solution according to the molar ratio of nickel, cobalt, and manganese in the nickel-cobalt lithium manganate to be provided, and control The total concentration of nickel-cobalt-manganese in the mixed solution of prepared nickel-cobalt-manganese salt is at 2mol / L;

[0032] Precipitant adopts sodium hydroxide aqueous solution, and its molar concentration is 8mol / L, and in the sodium hydroxide aqueous solution, will add according to every liter of sodium hydroxide aqueous solution, add the polyethylene glycol of 8g as dispersant; Adopt ammonia water as complexing agent, control The ammonia concentration in it is 10mol / L.

[0033] Among them, nickel sulfate, cobalt sulfate, and manganese...

Embodiment 2

[0041] According to the Ni:Co:Mn molar ratio of 1:1:1, prepare a mixed aqueous solution of nickel chloride, cobalt chloride, and manganese chloride with a concentration of 2.0mol / L, and add lemon that accounts for 0.5% of the total moles of nickel, cobalt, and manganese. trisodium acid. The prepared solution goes through the steps of precision filtration, demagnetization, and nitrogen gas to discharge dissolved oxygen, and is stored at 40-50°C for use.

[0042] Prepare 8mol / L sodium hydroxide aqueous solution, and add 8g polyvinyl alcohol according to the volume of every liter sodium hydroxide aqueous solution. The prepared solution is used after precision filtration, demagnetization, and nitrogen gas discharge to discharge dissolved oxygen.

[0043] Prepare 10mol / L ammonia solution.

[0044] Add 30L of bottom water to the 100L reactor, the ammonia concentration in the bottom water is 0.5mol / L, adjust the pH of the bottom water to 11.5 with aqueous sodium hydroxide solution,...

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Abstract

The invention relates to a method for preparing a small-size nickel-cobalt lithium manganate precursor. The method is characterized by comprising the following steps of: (1) preparing a solution from soluble salts of nickel, cobalt and manganese as materials, adopting a sodium hydroxide water solution as a precipitator, and adopting ammonia water or ammonium salt as a complexing agent; (2) merging and adding the obtained three solutions into a reaction kettle which contains bottom water and includes stirring and temperature control devices; leading in nitrogen to protect in a reaction process, and continuously carrying out reaction; and (3) stirring and aging for 4-6 hours after a temporary kettle is full, putting the aged material into washing and press filtering equipment to wash; removing moisture in a filter pressing manner; and then mixing and sieving by a 200mesh screen after baking and crushing. By adopting the method disclosed by the invention, industrialized production of the small-size nickel-cobalt lithium manganate precursor can be conveniently achieved; and the method is stable to control the particle size, and convenient to achieve requirements of the materials and equipment.

Description

technical field [0001] The invention relates to a preparation method of a precursor of nickel cobalt lithium manganese oxide with small particle size. Background technique [0002] As a new type of green secondary battery, lithium-ion batteries have the advantages of small size, light weight, large specific capacity, long cycle life, small self-discharge, and no memory effect. At present, it has been widely used in portable mobile tools, digital products, artificial satellites, aerospace and other fields, and has very broad prospects in the fields of electric bicycles and automobiles. Lithium-ion batteries are mainly composed of three parts: lower electrode material, negative electrode material and electrolyte. Among them, the positive electrode material is an important factor restricting the development of lithium-ion batteries in the direction of high energy and high density, and its cost is currently the highest in lithium-ion battery systems. [0003] At present, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G51/04C01G45/02
Inventor 晁锋刚文荣贾效旭沈立芳
Owner 宁夏中色金辉新能源有限公司
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