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Stable graphite material and preparation method and application thereof

A graphite material and stable technology, applied in the field of stable graphite material and its preparation, can solve the problems of limited application, insignificant improvement of high current charge and discharge performance, unstable performance, etc., and achieve a wide range of raw material sources and good electrochemical performance. , the effect of low cost

Inactive Publication Date: 2018-06-15
季彪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, scientific research workers have mainly conducted a lot of research on flake graphite as the negative electrode material of lithium-ion batteries, while there is little research on bulk graphite, and the negative electrode materials made of bulk graphite in the prior art have excellent high-current charge and discharge performance. The improvement is not significant, and the performance is unstable, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the embodiment of the present invention, a stable graphite material includes the following raw materials: 35 kg of bulk graphite, 18 kg of dichloroacetic acid, 7 kg of ethanolamine, and 1 kg of methyl acetate.

[0022] Dichloroacetic acid is mixed with 4.5 times its mass of deionized water to prepare a dichloroacetic acid solution; ethanolamine is mixed with its 3 times its mass of deionized water to prepare an ethanolamine solution. Crush the block graphite, pass it through a 200-mesh sieve, then mix it with dichloroacetic acid solution, raise the temperature to 150°C and seal and stir at this temperature for 65 minutes, then cool down to 88°C and seal and stir at this temperature for 30 minutes; stirring speed It is 350r / min. Then add ethanolamine solution, and seal and stir at a temperature of 118°C for 2.0h, then filter, wash, and dry to obtain mixture A; the stirring speed is 120r / min. Mix mixture A and methyl acetate uniformly, then raise the temperature to 55...

Embodiment 2

[0025] In the embodiment of the present invention, a stable graphite material includes the following raw materials: 45 kg of bulk graphite, 26 kg of dichloroacetic acid, 15 kg of ethanolamine, and 3 kg of methyl acetate.

[0026] Dichloroacetic acid is mixed with 5 times its mass of deionized water to prepare a dichloroacetic acid solution; ethanolamine is mixed with 3.5 times its mass of deionized water to prepare an ethanolamine solution. Crush the block graphite, pass through a 200-mesh sieve, then mix it with dichloroacetic acid solution, raise the temperature to 155°C and seal and stir at this temperature for 70 minutes, then cool down to 92°C and seal and stir at this temperature for 35 minutes; stirring speed It is 350r / min. Then add ethanolamine solution, seal and stir at 120°C for 2.1h, then filter, wash and dry to obtain mixture A; the stirring speed is 120r / min. Mix mixture A and methyl acetate evenly, then raise the temperature to 550°C at a heating rate of 1°C / mi...

Embodiment 3

[0029] In the embodiment of the present invention, a stable graphite material includes the following raw materials: 38 kg of bulk graphite, 20 kg of dichloroacetic acid, 9 kg of ethanolamine, and 1.5 kg of methyl acetate.

[0030] Dichloroacetic acid is mixed with 5 times its mass of deionized water to prepare a dichloroacetic acid solution; ethanolamine is mixed with 3.5 times its mass of deionized water to prepare an ethanolamine solution. Crush the block graphite, pass it through a 200-mesh sieve, then mix it with dichloroacetic acid solution, raise the temperature to 152°C and seal and stir at this temperature for 70 minutes, then cool down to 90°C and seal and stir at this temperature for 35 minutes; stirring speed It is 350r / min. Then add ethanolamine solution, and seal and stir at 119°C for 2.1h, then filter, wash, and dry to obtain mixture A; the stirring speed is 120r / min. Mix the mixture A with methyl acetate evenly, then raise the temperature to 550°C at a heating ...

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Abstract

The invention discloses a stable graphite material and a preparation method and an application thereof. The graphite material comprises the following raw materials in parts by weight: 35-45 parts of blocky graphite, 18-26 parts of dichloroacetic acid, 7-15 parts of ethanol amine, and 1-3 parts of methyl acetate. The blocky graphite is smashed, and mixed with a dichloroacetic acid solution to be subjected to heating, sealing and stirring treatment; next, an ethanol amine solution is heated, sealed and stirred, and then filtered, washed and dried to obtain a mixture A; and the mixture A and methyl acetate are uniformly mixed and then calcined in protection atmosphere. The graphite material has high electrochemical performance, so that electronic conductivity is greatly improved, and the reversible specific capacity, charging-discharging specific capacity, cycle performance stability and high-rate performance of the lithium ion battery are improved; the utilization rate of the blocky graphite can be improved, and an extremely obvious effect is achieved; and the preparation process is simple, the operation is convenient, the graphitization calcining time is shortened, the raw materialsare wide in resource, the cost is low, and large-scale industrial production can be achieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a stable graphite material and its preparation method and application. 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. [0003] 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. Graphite is currently the main commercial carbon anode material for lithium-ion batteries. The massive graphite grade is very high,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 季彪
Owner 季彪