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A composite negative electrode material mixed with graphite tailings and its preparation method and application

A technology of graphite tailings and negative electrode materials, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of wide application of theoretical specific capacity limitation, poor effect of graphite tailings, low cost of graphite tailings, etc., to achieve improved reversible The effect of specific capacity, low cost, and excellent electrochemical performance

Active Publication Date: 2020-08-21
安徽德亚电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite 372mAh g -1 The theoretical specific capacity greatly limits its wide application in the future. Although the existing use of graphene has made some progress, the cost of graphene is too high
Graphite tailings are low in cost, occupy a large amount of ground, damage the land, and are prone to landslides and mudslides. However, the effect of graphite tailings in batteries is too poor to achieve the same effect as graphite.

Method used

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  • A composite negative electrode material mixed with graphite tailings and its preparation method and application

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Embodiment 1

[0025] In an embodiment of the present invention, a method for preparing a composite negative electrode material mixed with graphite tailings comprises the following steps:

[0026] 1) Mixing hydrazine hydrate with 7 times its mass of deionized water to prepare a hydrazine hydrate solution; mixing hexamethylenetetramine with 2 times its mass of deionized water to prepare a hexamethylenetetramine solution.

[0027] 2) Crush the graphite tailings, pass through a 100-mesh sieve, and then mix it with a hydrazine hydrate solution 2.5 times its mass, raise the temperature to 58°C and stir at this temperature for 40 minutes, remove the filtrate by filtration, and take the precipitate; Add hexamethylenetetramine solution 1.2 times its mass, raise the temperature to 65°C and stir at this temperature for 50 minutes; then add citric acid, heat to 78°C, and stir at this temperature for 45 minutes, then pump Filter, wash, dry and obtain mixture A; Wherein the mass ratio of citric acid and ...

Embodiment 2

[0032] In an embodiment of the present invention, a method for preparing a composite negative electrode material mixed with graphite tailings comprises the following steps:

[0033] 1) Mixing hydrazine hydrate with 8 times its mass of deionized water to prepare a hydrazine hydrate solution; mixing hexamethylenetetramine with 3 times its mass of deionized water to prepare a hexamethylenetetramine solution.

[0034] 2) Crush the graphite tailings, pass through a 150-mesh sieve, and then mix it with a hydrazine hydrate solution 3 times its mass, raise the temperature to 60°C and stir at this temperature for 50 minutes, filter the filtrate, and take the precipitate; then pour it into the precipitate Add hexamethylenetetramine solution 1.4 times its mass, raise the temperature to 68°C and stir at this temperature for 60 minutes; then add citric acid, heat to 80°C, and stir at this temperature for 50 minutes, then pump Filter, wash, dry and obtain mixture A; Wherein the mass ratio o...

Embodiment 3

[0039] In an embodiment of the present invention, a method for preparing a composite negative electrode material mixed with graphite tailings comprises the following steps:

[0040] 1) Mix hydrazine hydrate with deionized water 8 times its mass to prepare a hydrazine hydrate solution; mix hexamethylenetetramine with deionized water 3 times its mass to prepare a hexamethylenetetramine solution.

[0041] 2) Crush the graphite tailings, pass through a 150-mesh sieve, then mix it with a hydrazine hydrate solution 2.8 times its mass, raise the temperature to 60°C and stir at this temperature for 50 minutes, remove the filtrate by filtration, and take the precipitate; Add hexamethylenetetramine solution with 1.3 times its mass, raise the temperature to 68°C and stir at this temperature for 60 minutes; then add citric acid, heat to 79°C, and stir at this temperature for 50 minutes, then pump Filter, wash, dry and obtain mixture A; Wherein the mass ratio of citric acid and graphite ta...

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Abstract

The invention discloses a composite negative electrode material doped with graphite tailings as well as a preparation method and application thereof. The graphite tailings are crushed and are mixed with a hydrazine hydrate solution; heating and stirring are performed; filtering is performed; precipitates are taken; a hexamethylenetetramine solution is added into the precipitates; heating and stirring are performed; then, citric acid is added; heating and stirring are performed; next, suction filtering, washing, drying, calcination and cooling are performed to obtain a mixture B; the mixture B,N-isopropylacrylamide, AG-80 epoxy resin and graphite are mixed, stirred and roasted to obtain a finished product. The prepared composite negative electrode material has good electrochemical performance; the reversible specific capacity, the charging and discharging efficiency, the circulation performance stability and the rate capability of the lithium ion battery can be improved; the graphite tailings can be reused; the effective is very obvious; the preparation process is simple; the operation is convenient; the raw material sources are wide; the cost is low; the material is suitable for mass industrial production.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a composite negative electrode material mixed with graphite tailings and a preparation method and application thereof. Background technique [0002] Compared with traditional lead-acid and nickel-cadmium secondary batteries, lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, stable discharge, long cycle life, and no memory effect. Energy storage power supplies are widely used in communication equipment, electric tools, aerospace and other fields. At present, with the continuous advancement of technology, people have put forward higher requirements for lithium-ion batteries. Lithium-ion batteries with high energy density, high rate performance, long cycle life, and high safety factor have gradually become a research hotspot. [0003] Graphite is currently the main commercial carbon anode material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 吴磊
Owner 安徽德亚电池有限公司