Method for producing lithium cobaltite by preparing hydroxyl trivalent cobalt oxide through wet chemical reaction

A hydroxyl trivalent and chemical reaction technology, applied in chemical instruments and methods, inorganic chemistry, cobalt compounds, etc., can solve the problems of slow oxygen diffusion, small profit margins, and poor reaction kinetic conditions, and achieve uniform product quality, The effect of good product quality and fast sintering reaction

Inactive Publication Date: 2012-02-08
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Application Information

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Problems solved by technology

[0005] During the reaction process, it is necessary to introduce air or oxygen to oxidize divalent cobalt to trivalent cobalt to produce lithium cobaltate. Due to the poor gas permeability of the material layer, poor reaction kinetics and slow oxygen diffusion rate, oxidation sintering Long time and low production capacity. At the same time, the oxidation of cobalt in the material layer is incomplet...

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  • Method for producing lithium cobaltite by preparing hydroxyl trivalent cobalt oxide through wet chemical reaction
  • Method for producing lithium cobaltite by preparing hydroxyl trivalent cobalt oxide through wet chemical reaction
  • Method for producing lithium cobaltite by preparing hydroxyl trivalent cobalt oxide through wet chemical reaction

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Embodiment 1

[0043] Main raw materials: cobalt sulfate and sodium hydroxide are industrial-grade products, 20% ammonia water is an industrial-grade product, lithium carbonate is a battery-grade product, and sodium hypochlorite solution is an analytical reagent. These main raw materials are commercially available.

[0044] 1. Solution preparation: 0.75M cobalt sulfate solution, 5.50M sodium hydroxide solution.

[0045] 2. Preparation of cobalt oxyhydroxide precursor

[0046] Add 0.70M cobalt sulfate solution into the reactor, heat to 60°C, add 5.26M sodium hydroxide solution into the reactor according to stoichiometry, the feeding time is 55 minutes, the alkali excess coefficient is 1.10, and the mass concentration is 20 % ammonia solution is used as a complexing agent, the pH value is adjusted to 9-14, and the stirring speed of the reactor is controlled to be 350 rpm. After the lye was added, the reaction was stirred at a constant temperature of 60° C. for 3 hours. Obtain a very viscous ...

Embodiment 2

[0052] Main raw material: same as embodiment 1.

[0053] 1. Solution preparation: 1.00M cobalt chloride solution, 5.26M sodium hydroxide solution.

[0054] 2. Preparation of cobalt oxyhydroxide precursor

[0055] Add 1.00M cobalt chloride solution in the reactor, heat to 70°C, slowly add 5.26M sodium hydroxide solution into the reactor according to stoichiometry, the alkali excess coefficient is 1.05, and add a mass concentration of 20% ammonia solution at the same time as complexing agent, adjust the pH value to 9-14, and control the stirring speed of the reactor to 300 rpm. After adding the lye, stir and react at 300 rpm at a constant temperature of 60°C for 3.5 hours. Obtain very viscous cobaltous hydroxide slurry, then add 1.0ml of analytically pure sodium hypochlorite solution per gram of cobalt in the reaction tank, stir at 300 rpm for 4 hours, and the oxidation temperature is 60°C, so that the cobaltous hydroxide material The slurry is fully oxidized to obtain a coba...

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Abstract

The invention discloses a method for producing lithium cobaltite by preparing hydroxyl trivalent cobalt oxide through wet chemical reaction. The method comprises the following steps of: preparing cobalt salt solution and sodium hydroxide solution; adding ammonia water serving as a complexing agent and stirring to generate cobaltous hydroxide slurry; adding sodium hypochlorite solution to oxidize the cobaltous hydroxide slurry; filtering, washing and drying to obtain a hydroxyl trivalent cobalt oxide precursor; uniformly mixing the precursor and lithium carbonate and then sintering to obtain a lithium cobaltite product; crushing the lithium cobaltite, then adding oxides of Ti, Mg and Al, serving as additives, into a muffle furnace and then sintering to perform doping treatment; and crushing and grading to obtain a product. By adopting the method, the need of a high-temperature oxidation step in the conventional synthesis process of the lithium cobaltite from the bivalent cobalt compound is avoided, air or oxygen is not required to be introduced in a sintering process, and influence of oxygen diffusion on reaction is avoided; and the method has the advantages of quick sintering reaction, low energy consumption, high capacity and high product quality.

Description

technical field [0001] The invention relates to a method for producing lithium cobaltate by preparing cobalt trivalent oxide of hydroxyl by wet chemical reaction. Background technique [0002] In order to gradually solve the three major problems of energy shortage, greenhouse gas and air pollution that restrict the current economic development, lithium-ion batteries, as an energy storage device, have high working voltage, high energy density, long cycle life, low self-discharge rate, No memory effect, no environmental pollution and other advantages. In the past ten years, lithium-ion batteries have achieved rapid development in technology, production, and market, and have formed a large emerging industry, which has attracted more and more attention from all aspects; at present, lithium-ion battery cathode materials mainly include lithium cobaltate and manganese acid. Lithium, nickel-cobalt lithium manganese oxide ternary materials, lithium iron phosphate, among them, the li...

Claims

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Application Information

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IPC IPC(8): C01G51/00
Inventor 李华成李普良李维健卢道焕黎贵亮王春飞胡明超韩要丛唐跃波韦慷
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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