Process for preparing modified natural graphite nodule

A natural graphite and modification technology, applied in the field of preparation of modified natural graphite balls, can solve the problems of high price, poor performance of modified natural graphite balls, unstable quality, etc., and achieve convenient operation, low cost, and mature technology Effect

Inactive Publication Date: 2006-06-28
冷亮
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The performance of modified natural graphite balls currently manufactured in China is poor, the quality is unstable, and there is a big gap compared with similar foreign products, and the price is high. There is an urgent need for a high-performance, low-cost preparation of modified natural graphite balls. process to produce this product to meet market demand

Method used

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Embodiment approach

[0006] The preparation method is as follows: mix the self-developed solvent and the treated pitch in a stirring tank at a ratio of 100:1, keep the temperature at 60-70° C., and stir for 2 hours, then mix the mixed solution with the treated natural graphite balls by Put it into the reaction kettle at a ratio of 100:3, keep the temperature at 60-70°C, stir for 3 hours, separate the solid-liquid mixture with a horizontal separator, keep the separated solid at a constant temperature of 40°C, keep it warm for 8 hours, and dry it , the dried material is broken up with a pulverizer, and the separated coated natural graphite ball is heated to 300°C at a heating rate of 3-4°C / min. After oxidizing for 2 hours, a natural graphite ball with an oxide film is obtained. The film-formed natural graphite balls are placed in a carbonization furnace, and in a vacuum state, the temperature is raised to 700°C at a heating rate of 3-5°C / min, and carbonized at a constant temperature for 2 hours. Afte...

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Abstract

A process for preparing the modified natural graphite balls used to prepared the negative electrode of Li ion battery includes such steps as proportionally mixing a special solvent with treated asphalt, adding the solution along with natural graphite balls into reactor, constant-temp heating to obtain coated natural graphite balls, separating, baking, breaking, carbonizing, and high-temp graphitizing. It has high reversible capacity (330 mAh / g) and cyclic numbers (360).

Description

1. Technical field: [0001] The invention belongs to a preparation method in the field of chemical industry and is mainly used for the preparation of a modified natural graphite ball. 2. Background technology: [0002] Modified natural graphite ball is a high-tech product, which is mainly used as negative electrode material of lithium-ion secondary battery, and its manufacturing technology requires high requirements. The performance of modified natural graphite balls currently manufactured in China is poor, the quality is unstable, and there is a big gap compared with similar foreign products, and the price is high. There is an urgent need for a high-performance, low-cost preparation of modified natural graphite balls. process to produce this product to meet market demand. 3. Contents of the invention: [0003] The purpose of the present invention is to provide a method for preparing modified natural graphite spheres to produce high-performance, low-cost modified natural g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C04B35/52
Inventor 冷亮
Owner 冷亮
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