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C-layer-cladding Co3V2O8 composite material and preparation method thereof

A composite material and coating technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of unrealized performance improvement, achieve the effects of improving charge and discharge cycle performance, reducing internal resistance, and simple operation

Active Publication Date: 2017-02-08
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very few research reports on related aspects, but none of them have realized Co 3 V 2 o 8 performance improvements for

Method used

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  • C-layer-cladding Co3V2O8 composite material and preparation method thereof
  • C-layer-cladding Co3V2O8 composite material and preparation method thereof
  • C-layer-cladding Co3V2O8 composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a pencil-shaped Co 3 V 2 o 8 The preparation method of the composite material of external cladding C layer, comprises the steps:

[0042] (1) Preparation of pencil-like Co 3 V 2 o 8 :

[0043] 1.1 Add ammonium metavanadate to deionized water at 70°C, keep stirring for 5 minutes, and the solution turns light yellow-green;

[0044] 1.2 Add NaOH, or LiOH, or KOH to the solution, and keep stirring for about 5 minutes until the solution becomes transparent and colorless;

[0045] 1.3 CoCl 2 ·6H 2 O, or Co(NO 3 ) 2 ·6H 2 O, or Co(Ac) 2 4H 2 O, or CoSO 4 ·7H 2 O was added to the above solution, and continued to stir for 10 minutes until the solution became transparent reddish brown, wherein the molar ratio of Co:V was 1:3, OH - The concentration range of 0.03mol / L;

[0046] 1.4 Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 160°C for a time range of 8 hours;

[0047] 1.5 Cool th...

Embodiment 2

[0071] This embodiment provides a spherical Co 3 V 2 o 8 The preparation method of the composite material of external cladding C layer, comprises the steps:

[0072] (1) Preparation of spherical Co 3 V 2 o 8 :

[0073] 1.1 Add ammonium metavanadate to deionized water at 80°C, and keep stirring for 10 minutes, the solution turns light yellow-green;

[0074] 1.2 Add CO(NH 2 ) 2 , and continued stirring for about 10min until CO(NH 2 ) 2 Fully dissolved;

[0075] 1.3 CoCl 2 ·6H 2 O, or Co(NO 3 ) 2 ·6H 2 O, or Co(Ac)2 4H 2 O, or CoSO 4 ·7H 2 O was added to the above solution, and continued to stir for 15 minutes until the solution turned into a transparent reddish brown, wherein the range of Co:V molar ratio was 1:5.5, CO(NH 2 ) 2 The concentration range of 0.078mol / L;

[0076] 1.4 Transfer the above-prepared solution into a hydrothermal reaction kettle, and react at a temperature of 220°C for 24 hours;

[0077] 1.5 Cool the reaction sample prepared above to r...

Embodiment 3

[0101] This embodiment provides a spherical Co 3 V 2 o 8 The preparation method of the composite material of external cladding C layer, comprises the steps:

[0102] (1) Preparation of spherical Co 3 V 2 o 8 :

[0103] ① Add ammonium metavanadate to deionized water at 75°C, and keep stirring for 7 minutes, the solution turns light yellow-green;

[0104] ② Add NaOH, or LiOH, or KOH to the solution, and keep stirring for about 7 minutes until the solution becomes transparent and colorless;

[0105] ③ CoCl 2 ·6H 2 O, or Co(NO 3 ) 2 ·6H 2 O, or Co(Ac) 2 4H 2 O, or CoSO 4 ·7H 2 O was added to the above solution and continued to stir for 10-15 minutes until the solution became transparent reddish brown, wherein the molar ratio of Co:V was 1:4, OH - The concentration range of 0.032mol / L;

[0106] ③Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 180°C for 12 hours;

[0107] ⑤ Cool the reaction sample prepared ab...

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Abstract

The invention provides a C-layer-cladding Co3V2O8 composite material and a preparation method thereof. The method comprises the steps of mixing Co3V2O8 with a carbon source; adding deionized water; performing grinding; drying a sample; after the drying, grinding and dispersing the sample; performing firing at the temperature of 600 to 700 DEG C for 6 to 8h; cooling the materials to room temperature; obtaining the C-layer-cladding Co3V2O8 composite material. The C-layer-cladding Co3V2O8 composite material provided by the invention has the advantages that source materials of the carbon source are rich; the price is low; in the whole process, toxic or harmful substances are not generated; a final product is of a composite structure; the specific surface area is large; the surface active points are many; the material is used as an electrode material; the contact between active substances and an electrode is increased; the internal resistance of a battery is reduced; the electron and ion diffusion performance is obviously improved; high discharging specific capacity and good discharging performance are realized; meanwhile, the C layer on the surface effectively reduces the stress deformation and peeling phenomena of Co3V2O8; the charging and discharging circulation performance of a lithium battery can be effectively improved by the material; cleanness and environment protection are realized; the operation is simple.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, in particular to a Co 3 V 2 o 8 Composite material covering C layer and preparation method thereof. Background technique [0002] Due to the advantages of high voltage, high specific energy, wide operating temperature range, high specific power, and stable discharge, lithium batteries are widely used in various electronic products or devices. However, as the market requirements become higher and higher, it is necessary to find new Electrode materials to meet the growing demand for energy storage. [0003] The negative electrode material is the key factor to determine the lithium battery, so the development of negative electrode material becomes the key to improve the performance of lithium battery. co 3 V 2 o 8 Due to its unique crystal structure and large tap density, it is a very ideal negative electrode material and has great application prospects in lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 吴孟强杨俭蒋微微冯婷婷
Owner SINOCAT ENVIRONMENTAL TECH
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