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Preparation method of doping lithium cobalt oxide

A technology of lithium cobaltate and doping elements, which is applied in the field of preparation of modified lithium cobaltate, can solve problems such as different preparation processes, achieve environmental friendliness, simple requirements for calcination equipment, and avoid excessive impurity content of lithium cobaltate products risk effect

Inactive Publication Date: 2018-03-30
LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent requires a long time of mixing, and the preparation process is obviously different from the patent of this application

Method used

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  • Preparation method of doping lithium cobalt oxide
  • Preparation method of doping lithium cobalt oxide
  • Preparation method of doping lithium cobalt oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The production steps are the same as above, and the specific parameters in each step are as follows:

[0040] The prepared solution A is a mixed solution of cobalt chloride and lithium chloride, and the cobalt concentration is 1mol / L, and the lithium concentration is 1.2mol / L.

[0041] The prepared B solution is 1.2mol / L ammonium bicarbonate solution.

[0042] Preparation C solution is 4.9g / L MgCl2 solution, and the doping amount of Mg in the final product is 0.5%.

[0043] Prepare solution D as 2.5mol / L sodium hydroxide solution.

[0044] Prepare E solution as 2mol / L hydrogen peroxide solution.

[0045] At the beginning of the synthesis reaction, the A solution, the C solution, the B solution, and the D solution were added to the reactor in parallel, and the reaction was carried out at a stirring intensity of 250 rpm to prepare cobalt hydroxide and lithium carbonate with uniform distribution of doping elements. mixture. The temperature of reaction system is 60 ℃, a...

Embodiment 2

[0051] This example is basically the same as Example 1, except that the following adjustment parameters are different:

[0052] The prepared solution A is a mixed solution of cobalt nitrate and lithium nitrate, and the concentration of cobalt is 1.5 mol / L, and the concentration of lithium is 2 mol / L.

[0053] The prepared B solution is 2mol / L ammonium bicarbonate solution.

[0054] Solution C is prepared as 14.7g / L aluminum chloride and nickel nitrate solution, and the doping amount of aluminum and nickel in the final product is about 1% of the final product mass.

[0055] Prepare solution D as 5mol / L sodium hydroxide solution.

[0056] Prepare E solution as 3mol / L hydrogen peroxide solution.

[0057]At the beginning of the synthesis reaction, A solution, C solution, B solution, and D solution were added to the reactor in parallel, and the reaction was carried out at a stirring intensity of 350 rpm to prepare cobalt hydroxide and carbonic acid with uniform distribution of do...

Embodiment 3

[0063] This example is basically the same as Example 1, except that the following adjustment parameters are different:

[0064] The prepared solution A is a mixed solution of cobalt sulfate and lithium chloride, and the cobalt concentration is 2mol / L, and the lithium concentration is 2.5mol / L.

[0065] The prepared B solution is 2.5mol / L ammonium bicarbonate solution.

[0066] Preparation C solution is 39.1g / L copper nitrate and yttrium chloride solution, the doping amount of Cu and Y is about 2% of the final product quality.

[0067] Prepare solution D as 4mol / L sodium hydroxide solution.

[0068] Prepare E solution as 4mol / L hydrogen peroxide solution.

[0069] At the beginning of the synthesis reaction, A solution, C solution, B solution, and D solution were added into the reactor in parallel, and the reaction was carried out at a stirring intensity of 450 rpm. The temperature of the reaction system was 75°C, and the flow rate of the B solution was A solution 0.65 times ...

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Abstract

The invention discloses a preparation method of a doping lithium cobalt oxide. A doping lithium cobalt oxide product is obtained by taking a cobalt salt and a lithium salt as raw materials, performingsynthesis reaction and oxidization reaction of ammonium bicarbonate solution, a doping element soluble salt solution, a sodium hydroxide solution and a hydrogen peroxide solution and performing filtering, washing, drying and calcination. A precipitant with a doping element, lithium and cobalt which are uniformly mixed and distributed is wet-synthesized, cobalt hydroxide is oxidized into hydroxylcobalt oxide, and finally calcination is performed to obtain the doping lithium cobalt oxide product with uniformly-distributed doping elements. By the preparation method, the defects that doping element oxide, a cobalt oxide, lithium carbonate and the like during the preparation process of a traditional doping lithium cobalt oxide are needed to be mixed for a long time and the doping element cannot be completely prevented from being locally enriched to easily cause phase separation and weaken material performance are prevented.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of modified lithium cobaltate used as positive electrode materials of lithium ion batteries. Background technique [0002] Since Japan's Sony Corporation successfully commercialized lithium-ion batteries in 1992, lithium-ion batteries rely on their high operating voltage, high energy density, and long cycle life. With unique advantages such as low self-discharge, no pollution, and good safety performance, it has been widely used as a power source for mobile phones, portable computers, video cameras, cameras, etc. and has gradually developed in aerospace, navigation, artificial satellites, small medical instruments, and military communication equipment. Become an energy battery for mainstream applications. [0003] Lithium cobalt oxide is currently the main cathode material for commercial lithium-ion batteries. However, the actual s...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 王树亮陈晓闯王红忠刘世红赵亮谈应东吴来红郭培庆张志龙
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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