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Method for preparing lithium cobalt oxide cathode material for lithium ion battery

A battery lithium cobalt oxide, positive electrode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of poor anti-overcharge performance, lower specific capacity, etc., and achieve high specific capacity, high energy density, good The effect of cycle stability

Inactive Publication Date: 2013-01-23
SHANGHAI JINZHONG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobalt oxide is the most commonly used material in lithium-ion battery cathode materials. Compared with other cathode materials, it has the advantages of high open circuit voltage, large specific energy and easy synthesis, and can be charged and discharged quickly. The prepared lithium cobalt oxide has disadvantages such as poor anti-overcharge performance and rapid decrease in specific capacity at higher charging voltages.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of Spherical Cobalt Carbonate Doped with Mg in Solid Solution

[0022] Use pure water as the bottom liquid, raise the temperature to 50°C, start the stirring, control the stirring speed at 100r / min, add ammonium bicarbonate, adjust the alkalinity of the bottom liquid to keep it at 10, mix the cobalt nitrate solution with Cobalt nitrate mass 10wt% magnesium chloride, stir to dissolve, mix evenly, continuously pump cobalt nitrate, magnesium chloride and ammonium bicarbonate solution into the bottom liquid, and precipitate reaction at 50°C, control the solid content of the slurry and alkali in the reaction system The reaction feed liquid continuously flows out from the upper overflow port of the reaction kettle into the aging kettle, and is washed by a washing filter press and dried by a vacuum dryer to obtain spherical cobalt carbonate doped with Mg in solid solution.

[0023] Preparation of Spherical Cobalt Carbonate Doped with Al in Solid Solution

[0024] ...

Embodiment 2

[0030] Preparation of Spherical Cobalt Carbonate Doped with Mg in Solid Solution

[0031] Use pure water as the bottom liquid, raise the temperature to 60°C, start the stirring, control the stirring speed at 150r / min, add ammonium bicarbonate, adjust the alkalinity of the bottom liquid to keep it at 20, mix the cobalt nitrate solution with Cobalt nitrate mass 15wt% magnesium chloride, stir to dissolve, mix evenly, continuously pump cobalt nitrate, magnesium chloride and ammonium bicarbonate solution into the bottom liquid, and precipitate reaction at 70°C, control the solid content of the slurry and alkali in the reaction system The reaction feed liquid continuously flows out from the upper overflow port of the reaction kettle into the aging kettle, and is washed by a washing filter press and dried by a vacuum dryer to obtain spherical cobalt carbonate doped with Mg in solid solution.

[0032] Preparation of Spherical Cobalt Carbonate Doped with Al in Solid Solution

[0033] ...

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Abstract

The invention discloses a method for preparing a lithium cobalt oxide cathode material for a lithium ion battery. The preparation method comprises the following steps of: adding magnesium chloride into a cobalt nitrate solution, uniformly mixing the mixture, continuously pumping cobalt nitrate, magnesium chloride and an ammonium bicarbonate solution into pure water serving as a base solution in a parallel flow mode, performing precipitation reaction to obtain spherical cobalt carbonate with a magnesium (Mg)-doped solid solution; preparing spherical cobalt carbonate with an aluminum (Al)-doped solid solution by a similar method; adjusting the alkalinity of base solution, adding titanium dioxide (TiO2) and a surfactant into cobalt nitrate solution; reacting to form spherical cobalt carbonate with a titanium (Ti)-doped solid solution; roasting the spherical cobalt carbonate with the Mg-doped solid solution, the spherical cobalt carbonate with the Al-doped solid solution, the spherical cobalt carbonate with the Ti-doped solid solution and lithium carbonate to obtain the lithium cobalt oxides cathode material for the lithium ion battery. The cathode material prepared for the lithium ion battery has high energy density and high cycling stability; and the lithium ion battery employing the cathode material has high specific capacity, high cycling stability and long service life.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery positive electrode material, in particular to a preparation method of a lithium ion battery lithium cobalt oxide positive electrode material. Background technique [0002] Lithium-ion battery, as a new type of secondary battery, has the characteristics of high specific capacity, high voltage, and good safety. It is widely used in the driving power of portable electrical appliances such as mobile phones, notebook computers, camcorders, DVD, and MP3. [0003] In order to develop high-capacity, high-power, and stable cycle lithium-ion batteries, new electrode materials are the key. Especially, cathode materials, as one of the core components of lithium-ion batteries, have always been the focus of research and development. Lithium cobalt oxide is the most commonly used material in lithium-ion battery cathode materials. Compared with other cathode materials, it has the advantages of high...

Claims

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Application Information

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IPC IPC(8): H01M4/525C01G51/00
CPCY02E60/122Y02E60/10
Inventor 姜波
Owner SHANGHAI JINZHONG INFORMATION TECH
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