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Continuous concentration gradient aluminum-titanium doped cobaltosic oxide as well as preparation method and application thereof

A technology of tricobalt tetroxide and concentration gradient, which is applied in the direction of cobalt oxide/cobalt hydroxide, electrochemical generators, electrical components, etc., which can solve the problems of battery capacity reduction and achieve high specific capacity, simple preparation method, and simple operation.

Pending Publication Date: 2021-03-23
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, LiCoO prepared by homogeneously doped tricobalt tetroxide 2 Although the material structure increases stability to a certain extent, it will lead to a decrease in battery capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A continuous concentration gradient aluminum-titanium-doped tricobalt tetroxide, the total doping amount of aluminum element is 4000ppm, the total doping amount of titanium element is 2000ppm, the doping amount of aluminum element increases from the inside to the outside in a continuous concentration gradient, and the doping amount of titanium element The amount increases from the inside to the outside in a continuous concentration gradient;

[0032] The product is a spherical structure with a tap density of 2.30g / cm 3 , the doping concentration of aluminum and titanium elements away from the center of the sphere is the smallest, and the doping concentration of aluminum and titanium elements on the surface of the product is the largest.

Embodiment 2

[0034] A continuous concentration gradient aluminum-titanium-doped tricobalt tetroxide, the total doping amount of aluminum element is 8000ppm, the total doping amount of titanium element is 4000ppm, the doping amount of aluminum element increases from the inside to the outside in a continuous concentration gradient, and the doping amount of titanium element The amount increases in a continuous concentration gradient from the inside to the outside.

[0035] The product is a spherical structure with a tap density of 2.53g / cm 3 , the doping concentration of aluminum and titanium elements away from the center of the sphere is the smallest, and the doping concentration of aluminum and titanium elements on the surface of the product is the largest.

Embodiment 3

[0037] A continuous concentration gradient aluminum-titanium-doped tricobalt tetroxide, the total doping amount of aluminum element is 5000ppm, the total doping amount of titanium element is 2500ppm, the doping amount of aluminum element increases from the inside to the outside in a continuous concentration gradient, and the doping amount of titanium element The amount increases in a continuous concentration gradient from the inside to the outside.

[0038] The product is a spherical structure with a tap density of 2.39g / cm 3 , the doping concentration of aluminum and titanium elements away from the center of the sphere is the smallest, and the doping concentration of aluminum and titanium elements on the surface of the product is the largest.

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode materials, and discloses continuous concentration gradient aluminum-titanium doped cobaltosic oxide. The total doping amount of an aluminum element is 4000-8000 ppm, the total doping amount of a titanium element is 2000-4000 ppm, and the doping amount of the aluminum element and the doping amount of the titaniumelement are both increased in a continuous concentration gradient from inside to outside. The invention further discloses a preparation method and application of the continuous concentration gradientaluminum-titanium doped cobaltosic oxide. The continuous concentration gradient aluminum-titanium doped cobaltosic oxide has relatively high tap density, and concentration gradient doping integratesdoping and coating, so that the stability of the surface and grain boundary of the material is enhanced, and after the cobaltosic oxide disclosed by the invention is sintered into lithium cobalt oxide, the lithium cobalt oxide still has high specific capacity and excellent cycle performance under high voltage. In addition, the preparation method disclosed by the invention is simple in process andconvenient for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a continuous concentration gradient aluminum-titanium doped tricobalt tetroxide and a preparation method and application thereof. Background technique [0002] Cobalt tetroxide is the main raw material of lithium cobalt oxide, which is mainly used in the field of 3C electronic products. The main problem of lithium cobalt oxide in current use is that the theoretical voltage is at least 4.2V, and the theoretical specific capacity is 260hA / kg, but the actual average voltage is only 3.6V, the highest has not reached 4.0V, and the actual specific capacity is 130hA / kg. kg, and the actual specific capacity decreases as the number of cycles increases. In order to release higher energy in a smaller space, lithium cobalt oxide is developing towards a high voltage of 4.5V ~ 4.6V, because more lithium ions can be extracted from the crystal str...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/525
CPCC01G51/04C01P2002/52C01P2006/11C01P2006/40H01M4/525H01M10/0525Y02E60/10
Inventor 许开华蒋振康李晨威郭苗苗
Owner GEM CO LTD
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