Preparation method of gradient-doping lithium cobalt oxide

A technology of gradient doping and lithium cobalt oxide, applied in the field of lithium ion batteries, can solve the problem that doping ions cannot show gradient distribution, and achieve the effect of avoiding excessive impurity content and simple requirements.

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

The doping ions in the doped lithium cobaltate prepared in this patent cannot present a gradient distribution

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The production steps are the same as above, and the specific parameters in each step are as follows:

[0038] The prepared solution A is a mixed solution of cobalt chloride and lithium chloride, and the cobalt concentration is 1mol / L, the lithium concentration is 1.2mol / L, and the volume is 120L.

[0039] The prepared B solution is 1.2mol / L ammonium bicarbonate solution.

[0040] Preparation C solution is 10L of magnesium chloride solution of 5.9g / L, and the total amount of Mg is 0.5% of final product quality.

[0041] Prepare solution D as 2.5mol / L sodium hydroxide solution.

[0042] Prepare E solution as 2mol / L hydrogen peroxide solution.

[0043] At the beginning of the synthesis reaction, determine the reaction time according to the preparation process for 16 hours, add solution C to solution A at a flow rate of 0.625L / h, and simultaneously flow the mixed solution of A and C, solution B, and solution D at a flow rate of 8.125L / h Add it into a reaction kettle, and...

Embodiment 2

[0049] This example is basically the same as Example 1, except that the following adjustment parameters are different:

[0050] The prepared solution A is a mixed solution of cobalt nitrate and lithium nitrate, and the cobalt concentration is 1.5mol / L, the lithium concentration is 2mol / L, and the volume is 250L.

[0051] The prepared B solution is 2mol / L ammonium bicarbonate solution.

[0052]Preparation C solution is 12.3g / L aluminum nitrate and nickel chloride solution 30L, and the total amount of aluminum and nickel is 1% of the final product quality.

[0053] Prepare solution D as 5mol / L sodium hydroxide solution.

[0054] Prepare E solution as 3mol / L hydrogen peroxide solution.

[0055] At the beginning of the synthesis reaction, determine the reaction time according to the preparation process for 30 hours, add solution C to solution A at a flow rate of 1.0L / h, and simultaneously flow the mixed solution of A and C, solution B, and solution D at a flow rate of 9.3L / h Ad...

Embodiment 3

[0061] This example is basically the same as Example 1, except that the following adjustment parameters are different:

[0062] The prepared solution A is a mixed solution of cobalt sulfate and lithium chloride, and the cobalt concentration is 2mol / L, the lithium concentration is 2.5mol / L, and the volume is 500L.

[0063] The prepared B solution is 2.5mol / L ammonium bicarbonate solution.

[0064] Preparation C solution is 100L of copper nitrate and yttrium chloride solution of 19.6g / L, and the total amount of copper and yttrium is 2% of the final product quality.

[0065] Prepare solution D as 4mol / L sodium hydroxide solution.

[0066] Prepare E solution as 4mol / L hydrogen peroxide solution.

[0067] At the beginning of the synthesis reaction, according to the preparation process, determine the reaction time of 40h, add the C solution to the A solution at a flow rate of 1.67L / h, and simultaneously flow the A, C mixed solution, B solution, and D solution at a flow rate of 10L...

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Abstract

The invention discloses a preparation method of a gradient-doping lithium cobalt oxide. A gradient-doping lithium cobalt oxide product is obtained by taking a cobalt salt in a certain volume and a lithium salt as raw materials, preparing a certain concentration of ammonium bicarbonate solution, a doping element soluble salt solution, a sodium hydroxide solution and a hydrogen peroxide solution, performing synthesis reaction and oxidization reaction and performing filtering, washing, drying and calcination. The synthesis reaction time is prolonged, the quantity of a doping agent added into a reaction kettle is gradiently increased, so that a doping element in the product is gradiently distributed, a precipitant with gradiently-distributed doping element and uniformly-mixed lithium and cobalt is wet-synthesized, cobalt hydroxide is oxidized into hydroxyl cobalt oxide, and finally calcination is performed to obtain the doping lithium cobalt oxide product with gradiently-distributed dopingelement. By the preparation method, the defects that doping elements of an oxide, a cobalt oxide, lithium carbonate and the like during the preparation process of a traditional doping lithium cobaltoxide are needed to be mixed for a long time and the doping element cannot be 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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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 陈晓闯王红忠刘世红张泓谢向辉吴来红郭培庆张志龙
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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