High-performance carbon positive electrode PAN hard carbon material and preparation method thereof

A carbon anode, high-performance technology, applied in the preparation/purification of carbon, battery electrodes, electrical components, etc., can solve the problems of poor rate performance of layered graphite anodes, increased lithium ion diffusion resistance, small interlayer spacing, etc., to achieve Easy industrial production, low production cost, simple control effect

Inactive Publication Date: 2020-04-17
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for layered graphite anode materials, in addition to the above disadvantages, the interlayer spacing is small, and Li+ can only be inserted into the end face of the material, which will inevitably increase the diffusion resistance of lithium ions.
Therefore, the rate performance of layered graphite anodes is poor, limiting its application in high-power batteries

Method used

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  • High-performance carbon positive electrode PAN hard carbon material and preparation method thereof
  • High-performance carbon positive electrode PAN hard carbon material and preparation method thereof
  • High-performance carbon positive electrode PAN hard carbon material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In step 1, the porcelain boat is covered with polyacrylonitrile powder, and the relative molecular weight of polyacrylonitrile powder is 15W.

[0029] Step 2, pre-oxidation: put the porcelain boat into a tube furnace for pre-oxidation. That is, the polyacrylonitrile was raised from room temperature to 280 °C at a rate of 1 °C / min in an oxygen atmosphere, kept for 2 hours, and cooled to room temperature.

[0030] Step 3, carbonization: raise the pre-oxidized polyacrylonitrile obtained in step 2 from room temperature to 600°C at 1°C / min in an argon atmosphere, keep it warm for 0.5h, then raise the temperature to 1100°C at 3°C / min and keep it warm for 1h . Cool to room temperature. The high-performance carbon anode PAN hard carbon material prepared by the present invention is obtained.

[0031] Step 4, cleaning impurities: grind the block in step 3, pass through a 100-mesh sieve, and ultrasonically disperse the obtained powder in alcohol or dimethylformamide at 60°C for...

Embodiment 2

[0033] Step 1: Cover the porcelain boat with polyacrylonitrile powder.

[0034] Step 2, pre-oxidation: put the porcelain boat into a tube furnace for pre-oxidation. Then, the polyacrylonitrile was raised from room temperature to 250° C. at a rate of 5° C. / min in an oxygen atmosphere, kept for 2 hours, and cooled to room temperature.

[0035] Step 3, carbonization: raise the pre-oxidized polyacrylonitrile obtained in step 2 from room temperature to 500°C at 3°C / min in an argon atmosphere, keep it warm for 0.5h, then raise the temperature to 1050°C at 4°C / min and keep it warm for 1h . Cool to room temperature. The high-performance carbon anode PAN hard carbon material prepared by the present invention is obtained.

[0036] Step 4, cleaning impurities: grind the block in step 3, pass through a 200-mesh sieve, and ultrasonically disperse the obtained powder in methanol at 60°C for 2 hours, filter with suction, dry to obtain pure hard polyacrylonitrile powder, and grind again 3...

Embodiment 3

[0038] Step 1: Cover the porcelain boat with polyacrylonitrile powder.

[0039] Step 2, put the porcelain boat into the tube furnace for pre-oxidation treatment. Then, the polyacrylonitrile was raised from room temperature to 300° C. at a rate of 3° C. / min in an oxygen atmosphere, kept for 2 hours, and cooled to room temperature.

[0040] Step 3, carbonization: raise the pre-oxidized polyacrylonitrile obtained in step 2 from room temperature to 550°C at 2°C / min in an argon atmosphere, keep it warm for 0.5h, then raise the temperature to 1000°C at 6°C / min and keep it warm for 1h . Cool to room temperature. The high-performance carbon anode PAN hard carbon material prepared by the present invention is obtained.

[0041] Such as figure 1 Shown, the impedance figure of the negative electrode material of lithium ion battery prepared by the present invention has shown the EIS spectrum of PAN hard carbon and graphite electrode, and in the high-frequency region, the semicircular a...

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Abstract

The invention discloses a high-performance carbon positive electrode PAN hard carbon material and a preparation method thereof. The preparation method comprises a pre-oxidation process and a carbonization process, polyacrylonitrile powder is sintered at high temperature under inert gas to obtain polyacrylonitrile hard carbon microsphere blocks; a negative electrode material for a lithium ion battery has the advantages of simple preparation method, low cost, environmental protection, no toxicity and the like, the prepared high-performance carbon positive electrode material is uniform in size and controllable in diameter range, large-scale industrial production can be realized, the rate capability is good, the cycling stability is relatively good, and the rate capability of the lithium ion battery is greatly improved.

Description

technical field [0001] The invention belongs to functional material technology and relates to a preparation method of a high-performance carbon anode material, in particular to a high-performance carbon anode PAN hard carbon material and a preparation method thereof. Background technique [0002] Due to its excellent energy storage characteristics, lithium-ion batteries are widely used in mobile communications, information technology, consumer electronics, mobile vehicles and other fields. With the progress and development of human society, advanced lithium-ion batteries need to have higher capacity, better rate performance and longer service life. Among all components of lithium-ion batteries, electrode materials are the key factors restricting the performance of lithium-ion batteries. Among them, the anode material, as an important part of the lithium-ion battery, has an important impact on the electrochemical performance of the lithium-ion battery. Among the anode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525Y02E60/10
Inventor 饶先发陈军钟盛文楼轶韬程斌王伟庭方辉张克
Owner JIANGXI UNIV OF SCI & TECH
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