Aluminum-doped cobalt(II,III) oxide and preparation method and application thereof

A technology of cobalt tetroxide and aluminum doping, used in cobalt oxide/cobalt hydroxide, electrochemical generators, structural parts, etc., can solve problems such as uneven distribution of elements, large differences in sedimentation rates, and influence on the structural stability of lithium battery materials. , to achieve the effect of uniform distribution of each element, uniform distribution, and easy large-scale industrial production

Active Publication Date: 2018-08-07
HUNAN YACHENG NEW MATERIAL CO LTD
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Problems solved by technology

[0004] The present invention provides an aluminum-doped cobalt tetroxide and its preparation method and application to solve the problem that the large difference in the sedimentation velocity of various elements in

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  • Aluminum-doped cobalt(II,III) oxide and preparation method and application thereof
  • Aluminum-doped cobalt(II,III) oxide and preparation method and application thereof
  • Aluminum-doped cobalt(II,III) oxide and preparation method and application thereof

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preparation example Construction

[0031] A preferred embodiment of the present invention provides a method for preparing aluminum-doped tricobalt tetroxide, comprising the following steps: (1) mixing an aluminum salt solution with a complexing agent to obtain a mixed solution; (2) mixing the cobalt salt solution, carbonate ion-containing The precipitant solution and the mixed solution prepared in step (1) are added into the reaction device in parallel flow, and co-precipitated to obtain aluminum-doped cobalt carbonate; (3) the aluminum-doped cobalt carbonate prepared in step (2) is Calcination can obtain aluminum doped tricobalt tetroxide.

[0032] The above-mentioned preparation method of aluminum-doped cobalt tetroxide, on the one hand, feeds the mixed solution of cobalt salt solution, precipitant solution and aluminum salt complexing agent in parallel flow, which overcomes the process of preparing aluminum-doped cobalt tetroxide by liquid phase co-precipitation method The problem of the large difference in ...

Embodiment 1

[0049] (1) The concentration is 0.015mol / L aluminum salt solution is mixed with citric acid solution to obtain a mixed solution, wherein the molar ratio of aluminum ion and complexing agent in the aluminum salt solution is 1: 0.5, and ammonium bicarbonate is used to adjust the pH value of the mixed solution is 2.5;

[0050] (2) The cobalt ion concentration is the cobalt salt solution of 0.4mol / L, the 2mol / L ammonium bicarbonate solution and the three kinds of solutions of the mixed solution in the step (1) and adopts the mode of concurrent flow to add the reactor with deionized water , the feed rate of the cobalt salt solution is 50ml / min, the feed rate of the mixed solution is 10ml / min, and the reaction conditions in the reactor are: pH value 7.1, temperature 35°C, reaction time 72h, to obtain aluminum-doped cobalt carbonate ;

[0051] (3) Wash the aluminum-doped cobalt carbonate in step (2) until the content of chloride ions is less than 100ppm, place it in a pusher kiln fo...

Embodiment 2

[0056] (1) the concentration is 0.075mol / L aluminum salt solution and citric acid solution are mixed to obtain mixed solution, the mol ratio of aluminum ion and complexing agent in aluminum salt solution is 1: 3, adopts the pH value of ammonium bicarbonate to adjust mixed solution 3.2;

[0057] (2) Three kinds of solutions of the cobalt salt solution, the 2mol / L ammonium bicarbonate solution and the mixed solution in the step (1) that the cobalt ion concentration is 1.8mol / L are added into the reaction kettle with deionized water in a parallel flow mode , the feed rate of the cobalt salt solution is 10ml / min, the feed rate of the mixed solution is 2ml / min, and the reaction conditions in the reactor are: pH value 7.1, temperature 40°C, reaction time 96h, to obtain aluminum-doped cobalt carbonate ;

[0058] (3) Wash the aluminum-doped cobalt carbonate in step (2) until the chloride ion content is less than 100ppm, place it in a pusher kiln for calcination, the calcination tempe...

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Abstract

The invention discloses a preparation method of aluminum-doped cobalt(II,III) oxide, comprising the steps of (1) mixing aluminum salt solution and a complexing agent to obtain a mixed liquid; (2) adding cobalt salt solution, a precipitating agent solution containing carbonate ions and the mixed liquid of step (1) into a reaction device in concurrent manner, and co-precipitating to obtain aluminum-doped cobalt carbonate; (3) calcining the aluminum-doped cobalt carbonate of step (2) to obtain the aluminum-doped cobalt(II,III) oxide. The three solutions are fed in concurrent manner, so that the problem is solved that the process of preparing aluminum-doped cobalt(II,III) oxide by liquid co-precipitating experiences great differences between precipitating speeds of various elements; the prepared aluminum-doped cobalt(II,III) oxide has uniform distribution of elements, and the doping quantity of aluminum in the aluminum-doped cobalt(II,III) oxide can be significantly increased to 0.3-0.6%.

Description

technical field [0001] The invention relates to the field of lithium-ion battery cathode materials, in particular to an aluminum-doped tricobalt tetroxide and its preparation method and application. Background technique [0002] Cobalt tetroxide is the main raw material of lithium cobalt oxide, which is mainly used in the field of 3C electronic products. At present, the cut-off voltage of lithium batteries used in communication tools is basically 4.2V. In order to release higher energy in a smaller space, lithium cobalt oxide is developing towards a high voltage of 4.5V. More lithium ions can be extracted from the crystal structure under high voltage, but a large amount of lithium ions will seriously affect the structural stability of the material, thereby affecting the cycle performance and safety performance of the battery. [0003] At present, coating and doping are mainly used to improve the structural stability of materials during high-voltage charging and discharging...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01G11/30H01G11/46H01M4/36H01M4/485H01M4/525H01M10/0525
CPCC01G51/04C01P2004/03C01P2006/11C01P2006/12C01P2006/80H01G11/30H01G11/46H01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 苗小欢童秋桃颜志雄廖扬青张州辉黄作雁颜敏亮王思维
Owner HUNAN YACHENG NEW MATERIAL CO LTD
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