Composite lithium cobalt oxide electrode and fabrication method thereof

A technology of composite lithium cobaltate and its production method, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of insufficient performance of lithium cobaltate electrodes, and achieve the purpose of suppressing side reactions on the electrode surface, inhibiting decomposition, and stabilizing the electrode surface structure Effect

Inactive Publication Date: 2015-12-09
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the current lithium cobaltate electrode with insuffici

Method used

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  • Composite lithium cobalt oxide electrode and fabrication method thereof
  • Composite lithium cobalt oxide electrode and fabrication method thereof
  • Composite lithium cobalt oxide electrode and fabrication method thereof

Examples

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Embodiment 1

[0030] This embodiment is used to illustrate the preparation method of lithium cobaltate electrode and the method for coating it with radio frequency magnetron sputtering to make composite lithium cobaltate electrode. The specific steps are as follows:

[0031] A. Preparation of conventional lithium cobalt oxide electrode

[0032] Weigh 80 parts by weight of lithium cobaltate and 10 parts by weight of acetylene black, mix evenly, add 10 parts by weight of polyvinylidene fluoride (PVDF) and use N-methylpyrrolidone (NMP) as a solvent, mix and grind to form a slurry and uniform Coated on aluminum foil and dried at 110°C to make a conventional lithium cobalt oxide electrode. That is to say, in this example, the ratio of lithium cobaltate powder, the positive electrode active material, conductive additive, and binder is 8:1:1. Here, the ratio range is generally 7:2:1 to 8.5:1:0.5, and 8:1 is commonly used. :1, so this example uses 8:1:1 as an example.

[0033] B. Install the target...

Embodiment 2

[0047] This embodiment is used to illustrate the preparation method of lithium cobaltate electrode and the method for coating it with radio frequency magnetron sputtering to make composite lithium cobaltate electrode. The specific steps are as follows:

[0048] A. Preparation of conventional lithium cobalt oxide electrode

[0049] Weigh 80 parts by weight of lithium cobaltate and 10 parts by weight of acetylene black, mix evenly, add 10 parts by weight of polyvinylidene fluoride (PVDF) and use N-methylpyrrolidone (NMP) as a solvent, mix and grind to form a slurry and uniform Coated on aluminum foil and dried at 110°C to make a conventional lithium cobalt oxide electrode. That is to say, in this example, the ratio of lithium cobaltate powder, the positive electrode active material, conductive additive, and binder is 8:1:1. Here, the ratio range is generally 7:2:1 to 8.5:1:0.5, and 8:1 is commonly used. :1, so this example uses 8:1:1 as an example.

[0050] B. Install the targ...

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Abstract

The invention provides a composite lithium cobalt oxide electrode and a fabrication method thereof, relating to the technology of a battery and aiming at solving the problem of poor performance of a high potential region of a conventional lithium cobalt oxide electrode. According to the summery of the technical scheme, the composite lithium cobalt oxide electrode comprises an ordinary lithium cobalt oxide electrode 1 and a lithium carbonate cladding layer 2, wherein the lithium carbonate cladding layer 2 is coated on the ordinary lithium cobalt oxide electrode 1 and deposited on the surface of the ordinary lithium cobalt oxide electrode 1 by a radio frequency magnetron sputtering process. The composite lithium cobalt oxide electrode has the advantages that the cladding layer is taken as an artificial solid electrolyte interface (SEI) membrane, the dissolution of a transition metal atom in an electrolyte and the decomposition of the electrolyte at a high potential are effectively suppressed, and a side reaction on the surface of the electrode is prevented from being generated, the structure of an active material is stabilized to a certain extent, the generation of a passivation layer on the surface of the electrode is slowed down, and the battery performance is improved. The lithium cobalt oxide electrode is applied to a lithium ion battery.

Description

technical field [0001] The invention relates to battery technology, in particular to a composite lithium cobalt oxide electrode and a manufacturing method thereof. Background technique [0002] As people pay more and more attention to the environment and energy, lithium-ion batteries as green energy are more and more popular due to their advantages such as high working voltage, long cycle life, low self-discharge rate, good safety performance, and no memory effect. It is widely used in electronic products such as notebook computers, mobile phones, and digital cameras. At the same time, the application of lithium-ion batteries is rapidly developing in the fields of electric vehicles, aviation and navigation, which puts forward higher requirements for the safety performance, power density, energy density and cycle life of lithium-ion batteries. [0003] As one of the core components of lithium-ion batteries, the performance of cathode materials will directly affect the perfor...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/36H01M4/1391
CPCH01M4/131H01M4/1391H01M4/366Y02E60/10
Inventor 李晶泽戴新义周爱军许进
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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