Preparation method of large-particle narrow-distribution aluminum doped tricobalt tetroxide

A technology of cobalt tetroxide with narrow distribution, applied in cobalt oxide/cobalt hydroxide, electrical components, battery electrodes, etc., can solve the problems of affecting the structural stability of lithium cobalt oxide, uneven distribution of aluminum elements, affecting the uniformity of aluminum elements, etc. To achieve the effect of complete crystal form, uniform distribution of aluminum elements, and good sphericity

Active Publication Date: 2019-09-10
JINCHUAN GROUP LIMITED +1
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Problems solved by technology

However, the lithium cobalt oxide prepared by the existing technology has the disadvantages of rapid decrease in specific capacity and poor cycle performance under the voltage condition of 4.45V and above.
In order to improve the performance of lithium cobalt oxide, lithium cobalt oxide material is doped with aluminum element. The existing doping method is to wrap a layer of aluminum salt in the form of coating after the sy...

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  • Preparation method of large-particle narrow-distribution aluminum doped tricobalt tetroxide
  • Preparation method of large-particle narrow-distribution aluminum doped tricobalt tetroxide

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Embodiment 1

[0025] A method for preparing aluminum-doped tricobalt tetroxide with narrow distribution of large particles, comprising a continuous synthesis stage of cobalt doped with aluminum-cobalt carbonate with narrow distribution of large particles and a calcination stage of cobalt doped with aluminum-cobalt carbonate with narrow distribution of large particles;

[0026] The continuous synthesis stage of the described large particle narrow distribution doped aluminum cobalt carbonate comprises the following steps:

[0027] a, nuclear growth process: cobalt metal ion concentration is 110g / L cobalt chloride metal solution with the flow rate of 350L / h, aluminum metal ion concentration is the aluminum chloride metal solution of 3.8g / L with the flow rate of 35L / h and Concentration is that the ammonium bicarbonate solution of 240g / L is with the flow rate of 450L / h, and flow joins and has concentration and is that 20g / L ammonium bicarbonate solution is the crystal nucleation generating kettle...

Embodiment 2

[0039] A method for preparing aluminum-doped tricobalt tetroxide with narrow distribution of large particles, comprising a continuous synthesis stage of cobalt doped with aluminum-cobalt carbonate with narrow distribution of large particles and a calcination stage of cobalt doped with aluminum-cobalt carbonate with narrow distribution of large particles;

[0040] The continuous synthesis stage of the described large particle narrow distribution doped aluminum cobalt carbonate comprises the following steps:

[0041] a, nuclear growth process: the cobalt metal ion concentration is the cobalt sulfate metal liquid of 90g / L with the flow rate of 450L / h, the aluminum sulfate metal liquid with the aluminum metal ion concentration of 8.4g / L with the flow rate and the concentration of 45L / h as 200g / L ammonium bicarbonate solution is added to the crystal nucleation kettle with a concentration of 40g / L ammonium bicarbonate solution as the bottom liquid at a flow rate of 550L / h to carry ou...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of large-particle narrow-distribution aluminum doped tricobalt tetroxide. The method includes a stage of continuously synthesizing large-particle narrow-distribution aluminum doped cobalt carbonate, and a stage of calcining the large-particle narrow-distribution aluminum doped cobalt carbonate. A large-particle cobalt carbonate precursor prepared by continuous centrifugation to improve the solid content, the continuous synthesis method and a special aluminum salt method in the cobalt carbonate wet-process synthesis stage is dense, narrow in particle size distribution, good in sphericity and uniform in aluminum element distribution. Through a three-step calcination method, the temperature in the first step is 180-250 DEG C and the cobalt carbonate is partially decomposed to form a micropore channel; the cobalt carbonate is completely decomposed in the second step in which the temperature is 300-500 DEG C; in the third step, the temperature is 650-800 DEG C, particle surfaces are densified, the content of the cobaltous phase is lower, the crystal form is more complete, and thelarge-particle narrow-distribution aluminum doped tricobalt tetroxide is formed. .

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing large-particle narrow-distribution aluminum-doped tricobalt tetroxide. Background technique [0002] Lithium-ion batteries are favored because of their high voltage, high energy density, long cycle life, and low environmental pollution. In recent years, with the further growth of demand for small portable power sources, good opportunities have been created for the development of the lithium-ion battery industry. The rapid development of the lithium-ion battery industry has driven lithium cobaltate, nickel-cobalt lithium With the rapid development of cathode materials such as lithium, the demand for cathode materials for lithium-ion batteries has also increased significantly. Especially in recent years, with the rapid development of the digital product industry, people's demand for high energy density lithium-ion batteries is increasing. Lith...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/525
CPCC01G51/04C01P2004/03C01P2004/32C01P2004/61H01M4/525Y02E60/10
Inventor 智福鹏江名喜马骞王娟辉陈晓闯吴来红刘世红郝亚莉吴晖君祁世青鲁相杰张振华颉颐何艳吴芳冯燕吴婧
Owner JINCHUAN GROUP LIMITED
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