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Doped cobalt carbonate, doped tricobalt tetroxide and preparation methods thereof

A technology of cobalt tetroxide and cobalt carbonate, applied in the directions of cobalt carbonate, cobalt oxide/cobalt hydroxide, etc., can solve the problems of lower specific capacity, influence of cobalt carbonate spheroidization and particle size growth, and poor anti-overcharge performance.

Active Publication Date: 2016-07-06
JINGMEN GEM NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Spherical cobalt carbonate is the most commonly used precursor material in lithium cobalt oxide cathode materials for lithium ion batteries. Compared with other cathode materials, lithium cobalt oxide has the advantages of high open circuit voltage, large specific energy and easy synthesis, and can be quickly charge and discharge, but the lithium cobalt oxide prepared by the prior art has disadvantages such as poor anti-overcharge performance and rapid decrease in specific capacity at a higher charging voltage.
In order to improve the performance of lithium cobaltate, the lithium cobaltate material is doped with Mg, Al, etc. The existing doping method is to add it in the form of co-precipitation during the synthesis of cobalt carbonate precursor, but the addition of Mg, Al, etc. will affect Spheroidization and Particle Size Growth of Cobalt Carbonate

Method used

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  • Doped cobalt carbonate, doped tricobalt tetroxide and preparation methods thereof
  • Doped cobalt carbonate, doped tricobalt tetroxide and preparation methods thereof
  • Doped cobalt carbonate, doped tricobalt tetroxide and preparation methods thereof

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[0022] Examples of the present invention provide a method for preparing doped cobalt carbonate, comprising the steps of:

[0023] Step S01: preparing cobalt carbonate;

[0024] Step S02: adding cobalt carbonate to the metal alkoxide and mixing to obtain cobalt carbonate coated with metal alkoxide, which is a physical adsorption process;

[0025] Step S03: drying the coated cobalt carbonate to obtain doped cobalt carbonate.

[0026] The preparation method of doped cobalt carbonate in the above-mentioned embodiment separates the process of preparing cobalt carbonate and doping, so that the doping process will not affect the growth of cobalt carbonate particles, and it is easy to control the morphology and particle size growth of cobalt carbonate, and can prepare Cobalt carbonate doped with uniform particle size, uniform coating and large particle size.

[0027] Specifically, the metal alkoxide solution is at least one of magnesium ethoxide solution, aluminum ethoxide solution ...

Embodiment 1

[0059] Step S01: preparing cobalt carbonate. The process of step S01 includes the following specific steps:

[0060] Step S01-1: Prepare the base solution.

[0061] Use pure water and ammonium bicarbonate as the bottom solution, control the carbonate concentration in the bottom solution to 3g / L, and the temperature at 48°C.

[0062] Step S01-2: Prepare cobalt salt solution and ammonium bicarbonate solution.

[0063] Preparation cobalt salt concentration is the cobalt salt solution of 60g / L, and ammonium bicarbonate concentration is the ammonium bicarbonate solution of 100g / L.

[0064] Step S01-3: preparing cobalt carbonate wet material.

[0065] According to the molar ratio of the cobalt salt in the cobalt salt solution and the ammonium bicarbonate in the ammonium bicarbonate solution is 1:2, the cobalt salt solution and the ammonium bicarbonate solution are added into the bottom liquid in parallel and reacted under stirring conditions to obtain a cobalt carbonate wet mater...

Embodiment 2

[0077] Step S01: preparing cobalt carbonate. The process of step S01 includes the following specific steps:

[0078] Step S01-1: Prepare the base solution.

[0079] Use pure water and ammonium bicarbonate as the bottom liquid, control the carbonate concentration in the bottom liquid to 5g / L, and the temperature to 36°C.

[0080] Step S01-2: Prepare cobalt salt solution and ammonium bicarbonate solution.

[0081] Preparation cobalt salt concentration is the cobalt salt solution of 180g / L, and ammonium bicarbonate concentration is the ammonium bicarbonate solution of 300g / L.

[0082] Step S01-3: preparing cobalt carbonate wet material.

[0083] According to the molar ratio of the cobalt salt in the cobalt salt solution and the ammonium bicarbonate solution in the ammonium bicarbonate solution is 1:3, the cobalt salt solution and the ammonium bicarbonate solution are added into the bottom liquid in parallel and reacted under stirring conditions to obtain a cobalt carbonate wet...

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Abstract

The present invention provides a doped cobalt carbonate preparation method. The preparation method comprises the following steps: cobalt carbonate is prepared; the cobalt carbonate is added into a metal alkoxide solution to be mixed to obtain the cobalt carbonate wrapped by the metal alkoxide; and the wrapped cobalt carbonate is dried to obtain a doped cobalt carbonate. The present invention also provides the doped cobalt carbonate prepared by the doped cobalt carbonate preparation method, a doped tricobalt tetroxide preparation method, and a doped tricobalt tetroxide prepared by the doped tricobalt tetroxide preparation method. The doped cobalt carbonate preparation method and the doped tricobalt tetroxide preparation method can prepare the doped cobalt carbonate and the doped tricobalt tetroxide which are uniform in particle sizes, evenly coated, and large in particle sizes, respectively.

Description

technical field [0001] The invention belongs to the technical field of preparation of cobalt-doped compounds, and in particular relates to doped cobalt carbonate, doped tricobalt tetroxide and a preparation method thereof. Background technique [0002] Spherical cobalt carbonate is the most commonly used precursor material in lithium cobalt oxide cathode materials for lithium ion batteries. Compared with other cathode materials, lithium cobalt oxide has the advantages of high open circuit voltage, large specific energy and easy synthesis, and can be quickly Charging and discharging, but the lithium cobaltate prepared by the prior art has disadvantages such as poor overcharge resistance and rapid decrease in specific capacity at a higher charging voltage. In order to improve the performance of lithium cobaltate, the lithium cobaltate material is doped with Mg, Al, etc. The existing doping method is to add it in the form of co-precipitation during the synthesis of cobalt carbo...

Claims

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Application Information

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IPC IPC(8): C01G51/06C01G51/04
Inventor 张云河刘文泽许开华乐绪清
Owner JINGMEN GEM NEW MATERIAL
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