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Preparation method of cobalt oxyhydroxide

A cobalt oxyhydroxide and oxidant technology, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of difficulty in increasing the compaction density of lithium cobaltate, and achieve the effects of low cost, high compaction density, and low energy consumption

Inactive Publication Date: 2012-07-11
GUANGDONG BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the technical defect that the existing cobalt tetroxide is difficult to increase the compaction density of lithium cobaltate as a raw material, the purpose of the present invention is to disclose a method for preparing a new type of raw material for lithium cobaltate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare a cobalt chloride solution with a cobalt concentration of 1.0mol / L; add 5L of a sodium hydroxide solution with a concentration of 5mol / L to the precipitation oxidation kettle, control the reaction temperature at 60°C, stir at a speed of 300 rpm, and use a flow rate of 400ml / h The cobalt chloride solution is added in the reactor, and sodium persulfate is evenly added at a speed of 130 g / hour at the same time. When the pH value of the solution in the reactor is 12.5, stop adding the cobalt chloride solution and sodium persulfate, and carry out the reaction after 5 hours. Solid-liquid separation, solid material into the washing tank for 3 deionized water washing, then the solid and deionized water are stirred at a ratio of 1:2 to make a slurry, and the slurry is pumped in at a rate of 2 liters / hour In a spray dryer (designed to evaporate water at 5 liters / hour), dry and granulate at 85°C, put the dried product into a mixer, mix and sieve to obtain cobalt oxyhydroxid...

Embodiment 2

[0024] Prepare a cobalt concentration of 1.5mol / L cobalt sulfate solution, add 5L of potassium hydroxide solution with a concentration of 6mol / L to the precipitation oxidation kettle, control the reaction temperature at 65°C, stir at a speed of 300 rpm, and flow sulfuric acid at a flow rate of 400ml / h Add the cobalt solution into the reactor, and simultaneously add ozone evenly at a rate of 2 liters / hour for oxidation, stop adding the cobalt sulfate solution and ozone when the pH value of the solution in the reactor reaches 12.5, and carry out solid-liquid separation after reacting for 8 hours; Put into the washing kettle and carry out 3 deionized water washings, then the solid material and deionized water are stirred by 1: 1.5 to make a slurry, and the slurry is pumped into the spray dryer at a speed of 2 liters / hour (design evaporation water volume 5 liters / hour), dry and granulate at 100°C, put the dried product into a mixer, mix and sieve to obtain large particle size cobal...

Embodiment 3

[0029] Prepare a cobalt nitrate solution with a cobalt concentration of 2.0 mol / liter, add 5 L of a concentration of 5 mol / L sodium hydroxide solution to the precipitation oxidation kettle, control the reaction temperature at 50°C, stir at a speed of 300 rpm, and use a flow rate of 400ml / h to Put the cobalt nitrate solution into the reaction kettle for reaction, and at the same time, uniformly add ozone at a rate of 1.5 liters / hour for oxidation. When the pH value of the solution in the reaction kettle reaches 13.5, stop adding the cobalt nitrate solution and ozone, and react the solid-liquid after 6 hours. Separate, put the solid material into the washing tank for 3 times of deionized water washing, then stir the solid in deionized water at a ratio of 1:1 to make a slurry, and pump the slurry into the spray dryer at a speed of 2 liters / hour (Designed evaporation water volume 5 liters / hour), carry out drying granulation at 110 ℃, put the product into the mixer after drying, mix...

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Abstract

The invention discloses a preparation method of cobalt oxyhydroxide. In the method, a cobalt salt solution is used as a raw material; precipitation and oxidation reaction are performed at the same time in an alkaline solution in the presence of an oxidant; and the precipitate is subjected to washing, impurity removal, drying, granulation, mixing and screening to obtain cobalt oxyhydroxide of which D50 is 10-20 microns. Compared with lithium cobaltate prepared by taking cobaltosic oxide as the raw material traditionally, the compaction density of the lithium cobaltate prepared from cobalt oxyhydroxide disclosed by the invention can be obviously improved by 0.2-0.3g / cm<3>, and the capacity and cycling performance are also obviously improved. Meanwhile, compared with the traditional preparation technology of the battery positive material raw material cobaltosic oxide, the technology disclosed by the invention is low in cost and low in energy consumption, is more environment-friendly and realizes economic and social benefits.

Description

technical field [0001] The invention belongs to the field of inorganic chemical new energy materials, and in particular relates to a preparation method of a lithium-ion battery cathode material raw material using a cobalt compound as an active material. Background technique [0002] With the continuous development of portable electronic products, new requirements are constantly put forward for the batteries used in them. In particular, the ever-emerging smartphones and tablet PCs have higher requirements for battery life, especially tablet PCs, most of which use an embedded battery design structure, which cannot be disassembled. Battery life has become a weakness in its development. Lithium cobalt oxide, as a high energy density cathode material, is the main cathode material for smartphone and tablet computer batteries, and its high compaction density is the main embodiment of its high energy density. [0003] The production of lithium cobaltate is basically made from trico...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCY02E60/122Y02E60/10
Inventor 周汉章唐红辉刘更好廖折军
Owner GUANGDONG BRUNP RECYCLING TECH
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