Compound lithium cobaltate cathode material, preparing method and application thereof

A technology for compounding lithium cobalt oxide and cathode materials, which is applied in electrode manufacturing, battery electrodes, and final product manufacturing, etc., can solve the problems of poor rate cycle performance and poor electrochemical performance of lithium cobalt oxide, etc. Chemical properties, high volume specific energy effect

Inactive Publication Date: 2009-11-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a composite lithium cobaltate positive electrode material, preparation method and application thereof. The modified lithium cobaltate has better processability, and its compaction density and volumetric energy density are higher than those of traditional lithium cobaltate. It can meet high energy density and good electrochemical performance at the same time, and effectively solve the problem of poor electrochemical performance of large-particle lithium cobalt oxide, that is, the problem of poor rate cycle performance during charge and discharge.

Method used

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  • Compound lithium cobaltate cathode material, preparing method and application thereof
  • Compound lithium cobaltate cathode material, preparing method and application thereof

Examples

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Effect test

Embodiment 1

[0018] Mix tricobalt tetroxide and lithium carbonate in an appropriate amount, sinter at 850°C for 24 hours in an air atmosphere, and then use a mortar to crush it into a lithium cobalt oxide material with a particle size of about 14 microns, and then mix it with ternary nickel cobalt manganese oxide (including nickel cobalt manganese The ratio is 1:1:1) and then sintered at 850° C. for 8 to 16 hours after mixing to make an active material for positive electrode. The ternary nickel-cobalt-manganese can be prepared by the following method: mix the hydroxide containing nickel-cobalt-manganese and lithium carbonate in an appropriate amount, sinter at 800°C for 24 hours in an air atmosphere, and then crush it into particles with a particle size of about 3 microns.

[0019] Copper foil is used as the current collector of the negative electrode, aluminum foil is used as the current collector of the positive electrode, the sintered lithium cobaltate is used as the positive electrode a...

Embodiment 2

[0021] Make 053048 prismatic lithium-ion battery according to the above method, the battery active material used is lithium cobaltate, wherein the content of ternary nickel-cobalt-manganese oxide lithium (wherein the ratio of nickel-cobalt-manganese is 1:1:1) is 0.6%, then The arithmetic average result of the battery capacity shows that the capacity of the battery 0.2C5A is 690 mAh, and the volume specific energy is 354Wh / l. The 100-cycle retention rate was 94.5%.

Embodiment 3

[0023] Make 053048 square lithium-ion battery according to the above method, the battery active material used is lithium cobaltate, wherein the content of ternary nickel-cobalt-manganese oxide lithium (wherein the ratio of nickel-cobalt-manganese is 1:1:1) is 1.5%, then The battery has a capacity of 682mAh and a volume specific energy of 350Wh / l. The 100-cycle retention rate was 94.8%.

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Abstract

The present invention relates to a compound lithium cobaltate cathode material, a preparing method thereof and a lithium ion secondary battery. The chemical formula of the cathode material is xLiNi1/3Mn1/3Co1/3O2-LiCoO2, wherein the numerical value of x is 0.005-0.05. The compound lithium cobaltate disclosed by the invention not only can satisfy the requirement of high energy density, but also can cause that the lithium ion battery has excellent electrochemical property. The problem of electrochemical property of large-particle lithium cobaltate is effectively settled. The compound lithium cobaltate cathode material has the characteristics of high volumetric specific energy and excellent circulating performance.

Description

technical field [0001] The invention relates to a composite lithium cobalt oxide cathode material, a preparation method and an application thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in 1991, the demand for their applications has continued to increase, and the market's requirements for energy density have continued to increase. Specifically, the energy density of lithium-ion batteries can be divided into volumetric energy density and gravimetric energy density, and the market needs to increase both volumetric energy density and gravimetric energy density at the same time. [0003] Under the premise of exerting the same capacity, in order to increase the volumetric energy density of the battery, it is necessary to increase the filling amount of the active material per unit volume of the battery. For the commonly used lithium cobalt oxide materials, the larger the particles, the greater the compaction density of the material, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04H01M10/38H01M10/36H01M10/40
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 陈丽秦学
Owner TIANJIN UNIV
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