Method for preparing bulk phase aluminum-doped cobaltosic oxide

A technology of cobalt tetroxide and cobalt hydroxide, applied in the field of lithium ion batteries, can solve the problems of uneven distribution of aluminum elements, low production efficiency, uneven precipitation of aluminum and cobalt, etc., to promote rapid growth, prevent oxidation, and improve production efficiency. Effect

Inactive Publication Date: 2018-11-13
LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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Problems solved by technology

However, when this method is used for the preparation of aluminum-doped lithium cobaltate, the reaction speed of aluminum salt and lye is fast, and there is uneven precipitation of aluminum and cobalt, which leads to the problem of uneven distribution of aluminum elements in cobalt tetroxide
In addition, the cobalt compound is very easy to oxidize, and the oxidized cobalt compound will hinder the rapid growth of the synthetic product. Therefore, this method also has the problem of low production efficiency.

Method used

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  • Method for preparing bulk phase aluminum-doped cobaltosic oxide
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  • Method for preparing bulk phase aluminum-doped cobaltosic oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Prepare a cobalt chloride solution with a concentration of 1mol / L as solution A; prepare a sodium hydroxide solution with a concentration of 2mol / L as solution B; prepare an ammonia solution with a concentration of 5mol / L, and add 5mL volume fraction per liter of ammonia solution The 30% hydrazine hydrate solution is the C solution; the hydrogen peroxide solution with a concentration of 5mol / L is prepared as the D solution; the concentration of 4g / L aluminum trichloride anhydrous ethanol solution is prepared as the E solution.

[0033] At the beginning of the synthesis reaction, the A solution, the B solution and the C solution flow into the reactor simultaneously, and at the same time, the E solution feeding pipe is divided into 6-9 small pipes, and the liquid outlet of each fine feeding pipe is fixed to the reactor for stirring Add E solution to the middle or tail of the paddle, and react under the stirring state of 500r / min. During the reaction, control the reaction p...

Embodiment 2

[0038] Prepare a cobalt sulfate solution with a concentration of 1.5mol / L as solution A; prepare a sodium hydroxide solution with a concentration of 4mol / L as solution B; prepare an ammonia solution with a concentration of 8mol / L, and add 15mL volume fraction per liter of ammonia solution A 30% hydrazine hydrate solution is solution C; a hydrogen peroxide solution with a concentration of 6 mol / L is prepared as solution D; an aluminum nitrate absolute ethanol solution with a concentration of 6 g / L is prepared as solution E.

[0039] At the beginning of the synthesis reaction, the A solution, the B solution and the C solution flow into the reactor simultaneously, and at the same time, the E solution feeding pipe is divided into 6-9 small pipes, and the liquid outlet of each fine feeding pipe is fixed to the reactor for stirring Add E solution to the middle or tail of the paddle, and react under the stirring state of 400r / min. During the reaction, the pH value of the reaction is con...

Embodiment 3

[0044] Prepare the cobalt nitrate solution with a concentration of 2mol / L as solution A; prepare the sodium hydroxide solution with a concentration of 6mol / L as solution B; The 30% hydrazine hydrate solution is solution C; the hydrogen peroxide solution with a concentration of 8 mol / L is prepared as solution D; the aluminum trichloride absolute ethanol solution with a concentration of 8 g / L is prepared as solution E.

[0045] At the beginning of the synthesis reaction, the A solution, the B solution and the C solution flow into the reactor simultaneously, and at the same time, the E solution feeding pipe is divided into 6-9 small pipes, and the liquid outlet of each fine feeding pipe is fixed to the reactor for stirring Add E solution to the middle or tail of the paddle, and react under the stirring state of 300r / min. During the reaction, control the pH value of the reaction to 9.0, the reaction temperature is 80°C, the flow rate of A solution is 300L / h, and the flow rate of B ...

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Abstract

The invention discloses a method for preparing bulk phase aluminum-doped cobaltosic oxide and belongs to the technical field of lithium ion batteries. The method comprises the following step: by taking a cobalt solution of a certain solution as a cobalt source, a sodium hydroxide solution as a precipitant, an ammonia water solution as a complexing agent, a hydrazine hydrate solution as a reducingagent, and an aluminum salt ethanol solution as a doping agent, carrying out a synthesis reaction, and putting an aluminum salt absolute ethyl alcohol solution into a reaction kettle to be subjected to reactions in a dispersion liquid addition mode a reaction process; after the synthesis reaction is completed, under a condition of a certain pH value, oxidizing a synthesis product into hydroxyl cobaltous oxide by using a hydrogen peroxide solution, washing a mixture, drying, and calcining, thereby obtaining a bulk phase aluminum-doped cobaltosic oxide product of which an aluminum element is uniformly distributed. The method is high in production efficiency. The bulk phase aluminum-doped cobaltosic oxide product prepared by using the method has an aluminum doping amount of 0.5-1%, comprisesthe aluminum element which is uniformly distributed, has laser granularity of 15-20mu m, a tap density greater than or equal to 2.5g/cm<3>, a specific surface area of 1.0-3.0m<2>/g, and has a blockyor sphere-like morphology.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for preparing bulk aluminum doped tricobalt tetroxide used for preparing lithium cobalt oxide, a cathode material of lithium ion batteries. Background technique [0002] The lithium-ion battery prepared with lithium cobaltate as the positive electrode material has the characteristics of light weight, large capacity, high specific energy, high working voltage, stable discharge, suitable for high current discharge, good cycle performance, and long life. It is mainly used in 3C digital field. [0003] Lithium cobalt oxide is developing in the direction of high voltage, high compaction, and high cycle performance. Therefore, the requirements for the raw material cobalt tetroxide are getting higher and higher. co 3 o 4 It is a functional material with special structure and properties, conventional Co 3 o 4 The market is already facing the status quo of grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/362H01M4/525H01M10/0525Y02E60/10
Inventor 朱永泽陈晓闯王红忠刘世红吴来红赵宗明李俊杰杜江吴婧岳心圆
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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