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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  • Description
  • Claims
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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-ove

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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

Examples

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Example Embodiment

[0022] An example of the present invention provides a method for preparing doped cobalt carbonate, comprising the following steps:

[0023] Step S01: prepare cobalt carbonate;

[0024] Step S02: adding cobalt carbonate to the metal alkoxide and mixing to obtain the cobalt carbonate coating the metal alkoxide, and this process is a process of physical adsorption;

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

[0026] In the preparation method of doped cobalt carbonate in the above embodiment, the processes of preparing cobalt carbonate and doping are carried out separately, 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 be prepared Doped cobalt carbonate with uniform particle size, uniform coating and large particle size.

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

Example Embodiment

[0058] Example 1

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

[0060] Step S01-1: Prepare a bottom solution.

[0061] Pure water and ammonium bicarbonate were used as the bottom liquid, the carbonate concentration in the bottom liquid was controlled to be 3 g / L, and the temperature was 48 °C.

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

[0063] Prepare a cobalt salt solution with a cobalt salt concentration of 60 g / L and an ammonium bicarbonate solution with an ammonium bicarbonate concentration of 100 g / L.

[0064] Step S01-3: Prepare 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 to the bottom liquid and reacted under stirring conditions to obtain a cobalt...

Example Embodiment

[0076] Example 2

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

[0078] Step S01-1: Prepare a bottom solution.

[0079] Pure water and ammonium bicarbonate were used as the bottom liquid, the carbonate concentration in the bottom liquid was controlled to be 5 g / L, and the temperature was 36 °C.

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

[0081] Prepare a cobalt salt solution with a cobalt salt concentration of 180 g / L and an ammonium bicarbonate solution with an ammonium bicarbonate concentration of 300 g / L.

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

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

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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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