A kind of hard carbon negative electrode material and its preparation method and application

A negative electrode material, hard carbon technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of difficult industrial production, high cost, complex preparation process, etc., and achieve stable product properties, low cost, and good electrochemical performance. Effect

Active Publication Date: 2016-03-02
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the existing hard carbon negative electrode materials with complex preparation process, high cost and difficulty in industrial production, and provide a hard carbon negative electrode material and its preparation method and application

Method used

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  • A kind of hard carbon negative electrode material and its preparation method and application
  • A kind of hard carbon negative electrode material and its preparation method and application
  • A kind of hard carbon negative electrode material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0038] The coal tar pitch is pulverized to less than 0.1 mm, and 100 g of benzaldehyde, 50 g of sulfuric acid and 1000 g of the coal tar pitch powder are added to the reaction kettle under stirring, and the temperature is raised to 200 ° C for cross-linking reaction and polymerization for 5 hours to obtain cross-linking polymerization. After the reaction, it was dissolved in 500 g of washing oil at 200 ° C for 2 hours, hot filtered, the filtrate was vacuum-dried (-0.09 ~ -0.1 MPa, 150 ° C) for 2 hours, cooled to room temperature and discharged. 100 mesh sieve, put it into a well-type carbonization furnace, heat it up to 600 ℃ under nitrogen protection for pre-carbonization treatment for 2 hours, cool down to room temperature, and pass the pulverized material through a 100 mesh sieve after crushing, and put it in a pusher kiln under nitrogen protection. After carbonization treatment at 1000°C for 2 hours, a hard carbon negative electrode material was prepared. The first discharg...

Embodiment 2

[0040] The coal tar pitch was pulverized to less than 0.1 mm, 300 g of formaldehyde, 50 g of sulfuric acid and 1000 g of the coal tar pitch powder were added to the reaction kettle under stirring and mixed, and the temperature was raised to 80 ° C for cross-linking reaction and polymerization reaction for 10 hours. Dissolve the filtrate in 2000g toluene at 100℃ for 6 hours, filter it hot, vacuum dry the filtrate (-0.09~-0.1MPa, 150℃) for 2 hours, cool down to room temperature and discharge the material. In the type carbonization furnace, the temperature was raised to 400 °C under nitrogen protection for 5 hours of pre-carbonization treatment, and then cooled to room temperature. hour, the hard carbon anode material was prepared, the first discharge capacity of the half-cell was 296.4mAh / g, and the first discharge efficiency was 76.5%.

Embodiment 3

[0042]Pulverize the petroleum asphalt to less than 0.1 mm, add 200 g of paraformaldehyde, 100 g of p-toluenesulfonic acid and 1000 g of the petroleum asphalt powder alternately into the reaction kettle under stirring, and then heat up to 150 ° C to carry out cross-linking reaction and polymerization reaction 2 hours, dissolve in 1250g xylene at 150°C for 4 hours after the reaction, filter hot, vacuum dry the filtrate (-0.09~-0.1MPa, 150°C) for 2 hours, cool down to room temperature and discharge, pulverize the pulverized product After passing through a 100-mesh sieve, it was put into a well-type carbonization furnace, and the temperature was raised to 500 ° C under nitrogen protection for pre-carbonization for 4 hours, and then cooled to room temperature. After being carbonized at 1600°C for 2 hours, a hard carbon negative electrode material was prepared. The first discharge capacity of the half cell was 285.7mAh / g, and the first discharge efficiency was 78.5%.

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Abstract

The invention provides a preparation method of a hard carbon negative electrode material. The method comprises the steps of: (1) subjecting a high molecular polymer and a cross-linking agent to crosslinking and polymerization reactions so as to obtain a cross-linked polymer; (2) conducting crushing and screening; (3) under the protection of an inert gas, carrying out pre-carbonization treatment at a temperature of 400-600DEG C, performing cooling to room temperature, and carrying out crushing and screening; (4) under the protection of an inert gas, carrying out carbonization treatment at a temperature of 1000-1600DEG C, thus obtaining a hard carbon negative electrode material. The high molecular polymer is asphalt, epoxy resin or phenolic resin. The invention also provides a hard carbon negative electrode material prepared by the method as well as its application as a lithium ion battery negative electrode material. The preparation method of the invention is simple and practicable, and has easily available and cheap raw materials. The hard carbon negative electrode material provided in the invention has the advantages of: good comprehensive performance; good electrochemical performance; good cycle performance; good high current charge-discharge performance; good security; good adaptability to electrolyte and other additives; and stable product property, with almost no difference among batches.

Description

technical field [0001] The invention relates to a hard carbon negative electrode material and a preparation method and application thereof. Background technique [0002] In the 21st century, with the increasing depletion of oil reserves on the earth and the greenhouse effect of automobile exhaust emissions on the environment, in recent years, as a new use that effectively utilizes the characteristics of small size and light weight of lithium-ion batteries, it is actively used as a Development of batteries for electric vehicles such as electric vehicles (EVs) driven by electric motors and hybrid electric vehicles (HEVs) that combine an engine and an electric motor. Among them, HEVs that combine an engine and a battery-driven electric motor have the characteristics of economy and low fuel consumption. [0003] Hard carbon anode materials have attracted much attention due to their firm and stable macromolecular structure, which is more suitable for use under high current chargi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/38H01M4/133
CPCY02E60/10
Inventor 谢秋生乔永民杜旭吴敏昌
Owner SHANGHAI SHANSHAN TECH CO LTD
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