Preparation method and application of pitch-based low graphitized carbon material

A graphitized carbon, pitch-based technology, applied in carbon preparation/purification, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of limited lithium ion storage capacity and small graphite layer spacing, and achieve excellent cycle performance, operation The effect of few steps and good rate performance

Inactive Publication Date: 2018-12-11
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of small interlayer spacing and few defect sites, graphite has limited storage capacity for lithium ions.

Method used

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  • Preparation method and application of pitch-based low graphitized carbon material

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preparation example Construction

[0017] A kind of preparation method of pitch-based low graphitization carbon material of the present invention, comprises the following steps:

[0018] Step 1. Heat the coal tar pitch to 400-430°C, react under normal pressure for 1-3 hours, and vacuum distill for 0.5-1 hour to obtain molten coal tar pitch;

[0019] Step 2, adding epoxy resin to the molten coal tar pitch under stirring conditions to obtain a mixture of coal tar pitch and epoxy resin, the mass ratio of epoxy resin to coal tar pitch is 0.1 to 2:1; after cooling to room temperature, crush the mixture;

[0020] Step 3. Put the mixture powder prepared in step 2) into a carbonization furnace, heat to 700-1000° C. under an inert atmosphere, and obtain a pitch-based low graphitization carbon material after cooling.

[0021] A pitch-based low-graphitizable carbon material for use as an anode for lithium-ion batteries.

Embodiment 1

[0024] In this example, the process of preparing pitch-based low graphitized carbon material is as follows:

[0025] 1) Heat 50 g of coal tar pitch with a softening point of 65°C to 400°C, react at normal pressure for 3 hours, and vacuum distill for 0.5 hour to obtain molten coal pitch;

[0026] 2) Add 20g of epoxy resin to the above-mentioned molten coal tar pitch and stir, after mixing evenly, cool to room temperature and pulverize the mixture;

[0027] 3) Carbonize the obtained mixture powder, raise the temperature to 700°C at 5°C / min under the protection of an inert gas in a tube furnace and maintain it for 2h, take it out after cooling, and obtain a pitch-based low graphitizable carbon material.

[0028] The scanning electron micrographs of the prepared pitch-based low graphitized carbon materials are as follows: figure 1 shown.

[0029] The prepared pitch-based low-graphitized carbon material, acetylene black, and PVDF (polyvinylidene fluoride) were prepared as negativ...

Embodiment 2

[0032] In this example, the process of preparing pitch-based low graphitized carbon material is as follows:

[0033] 1) heating 30 g of coal tar pitch with a softening point of 65°C to 430°C, reacting at normal pressure for 1 hour, and vacuum distillation for 1 hour to obtain molten coal tar pitch;

[0034] 2) Add 30g of epoxy resin to the above-mentioned molten coal tar pitch and stir, mix evenly, after cooling to room temperature, pulverize the mixture;

[0035] 3) Carbonize the obtained mixture powder, raise the temperature to 800°C at 3°C / min under the protection of an inert gas in a tube furnace and maintain it for 1h, take it out after cooling, and obtain a pitch-based low graphitizable carbon material.

[0036] The prepared pitch-based low-graphitized carbon material, acetylene black, and PVDF (polyvinylidene fluoride) were prepared as negative electrode materials in a mass ratio of 7:2:1. The current collector was copper foil, and a lithium-ion battery was assembled in...

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Abstract

The invention relates to a preparation method and application of a pitch-based low graphitized carbon material. The preparation method comprises the following steps: heating coal tar pitch to 400 to 430 DEG C, reacting at normal pressure for 1 to 3 h, and performing vacuum distillation for 0.5 to 1 h to obtain molten coal tar pitch; adding epoxy resin into the molten coal tar pitch under a stirring condition to obtain a mixture of the coal tar pitch and the epoxy resin, wherein the mass ratio of the epoxy resin to the coal tar pitch is (0.1 to 2):1; cooling to room temperature, and then smashing the mixture; placing obtained mixture powder in a carbonization furnace, heating to 700 to 1000 DEG C under an inert atmosphere, and cooling to obtain the pitch-based low graphitized carbon material. The preparation method disclosed by the invention has a simple technological process, raw material sources are rich, and the prepared pitch-based low graphitized carbon material is used as a negative electrode of a lithium ion battery, and has the advantages of high specific capacity, good rate performance, excellent cycle performance and the like.

Description

technical field [0001] The invention relates to the technical field of carbon material preparation, in particular to a preparation method and application of a pitch-based low graphitization carbon material. Background technique [0002] The development of human society is facing many severe challenges, one of which is to meet the increasing energy demand. Human beings' unrestrained use of natural resources has led to increasingly prominent ecological problems, and energy shortages will inevitably occur in the future. In order to solve this problem, new energy must be vigorously developed. Without energy storage equipment, the utilization of renewable energy such as wind energy, tidal energy, and solar energy will be limited, so the research on new generation energy storage materials and equipment is of great significance. [0003] Lithium-ion secondary batteries have become a key research object in the field of new energy due to their high energy density, stable charge-dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/205H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525C01B32/05C01B32/205H01M2004/027H01M2004/021Y02E60/10
Inventor 于兴河
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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