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Preparation method for cladding lithium cobaltoxide cathode material with alumina

A technology of coating lithium cobaltate and positive electrode materials, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of cumbersome filtration and washing steps, rising costs, and high electrochemical capacity, so as to achieve easy and convenient raw material composition and product formulation. The effect of reducing preparation cost and simple preparation process

Active Publication Date: 2013-11-13
OCELL NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has good product uniformity and high electrochemical capacity. Under the charge and discharge conditions of 3-4.5V, the reversible specific capacity of lithium cobalt oxide is as high as 180 mAh / g and the cycle performance is good. and washing steps are more cumbersome, and cause the cost to rise

Method used

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  • Preparation method for cladding lithium cobaltoxide cathode material with alumina
  • Preparation method for cladding lithium cobaltoxide cathode material with alumina

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Mix lithium cobaltate and aluminum isopropoxide, wherein the molar ratio of aluminum isopropoxide to lithium cobaltate is 1:50, ball mill for 20 hours to obtain a uniformly mixed powder, heat-treat the above mixed material at 300°C for 2 hours, Then, it was cooled to room temperature at a cooling rate of 20° C. / min to prepare an aluminum oxide-coated lithium cobalt oxide cathode material.

Embodiment 2

[0018] Mix lithium cobaltate and aluminum ethoxide, wherein the molar ratio of aluminum isopropoxide to lithium cobaltate is 1:200, ball mill for 6 hours to obtain a uniformly mixed powder, heat-treat the above mixed material at 300°C for 2 hours, and then Cool down to room temperature at a cooling rate of 10°C / min to prepare an alumina-coated lithium cobalt oxide cathode material.

Embodiment 3

[0020] Mix lithium cobaltate and aluminum acetylacetonate, wherein the molar ratio of aluminum isopropoxide to lithium cobaltate is 1:50, ball mill for 20 hours to obtain a uniformly mixed powder, heat-treat the above mixed material at 600°C for 2 hours, and then Cool to room temperature at a cooling rate of 20°C / min to prepare an alumina-coated lithium cobalt oxide cathode material.

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Abstract

The invention relates to a preparation method for cladding lithium cobaltoxide cathode material with alumina. In detail, the preparation method comprises the following steps: mixing lithium cobaltoxide and aluminium compound; carrying out ball milling on the mixture to obtain evenly mixed powder; heating the mixture for 0.5-2 hours; cooling slowly to room temperature to obtain the lithium cobaltoxide cathode material cladded by alumina. According to the invention, solid phase aluminium compound is taken as reactant; raw material components directly and evenly distributed on the surface of lithium cobaltoxide in the ball milling process and products formula can be easily controlled; mass production can be realized; and the lithium cobaltoxide cathode material cladded by alumina that is prepared by the invention has advantages of high specific capacity and excellent cycle performance, which is shown by an electrochemistry test.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a preparation method of aluminum oxide-coated lithium cobalt oxide cathode materials. Background technique [0002] Lithium cobalt oxide is currently the most commercialized and used lithium-ion battery cathode material. Its production process is mature, its performance is good, and it has better cycle performance than other cathode materials. It is an ideal cathode material for lithium-ion batteries, accounting for about 90% of the market. However, with the development of electronic devices such as current 3C products, higher requirements are placed on the energy density of batteries. The theoretical gram capacity of lithium cobalt oxide material is 274mAh / g, however Li 1-x When CoO2 is deeply discharged, when the delithiation amount x>0.5, it will promote the desorption of oxygen in its lattice, resulting in an unstable crystal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62
CPCY02E60/122Y02E60/10
Inventor 王保峰黄德勇朱希平张平曹杰张天鸽白祥
Owner OCELL NEW ENERGY TECH
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