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Hard carbon graphite composite negative electrode material preparation method

A technology of negative electrode material and graphite, applied in the field of preparation of hard carbon graphite composite negative electrode material, can solve the problem of poor rate performance of graphite negative electrode material, and achieve the effects of excellent comprehensive performance, good adaptability and good cycle performance.

Inactive Publication Date: 2017-12-22
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor rate performance of graphite negative electrode materials in the prior art, and to prepare a surface-modified graphite negative electrode material with stable product properties by adopting a method with high yield and simple process

Method used

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  • Hard carbon graphite composite negative electrode material preparation method
  • Hard carbon graphite composite negative electrode material preparation method
  • Hard carbon graphite composite negative electrode material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1. Weigh 100g of bisphenol A and weigh 400ml of NaOH solution with a mass concentration of 6%, mix and stir at 50°C for 10-15min until dissolved;

[0026] Step 2. Add 220 g of artificial graphite fine powder to the prepared mixed solution, the artificial graphite fine powder is subdivided by artificial graphite with a D50 of 10.7 μm, and ultrasonically stirred evenly to form a suspension;

[0027] Step 3. When the temperature of the suspension is lower than 40°C, add 100g of epichlorohydrin, transfer the mixture to a four-necked flask, and turn on the stirrer to react. The reaction is divided into seven stages: 57±4°C for 15 minutes; 70 React at ±3°C for 15 minutes; at 80±3°C for 30 minutes; at 85±3°C for 10 minutes; at 90±3°C for 10 minutes; at 95±2°C for 20 minutes; at 97±2°C for 20 minutes to obtain the reaction product;

[0028] Step 4, washing the reaction product in step 3 to neutrality, and then dehydrating under vacuum at -0.095MPa to obtain a hard carbon / g...

Embodiment 2

[0031] Step 1. Weigh 120g of bisphenol A and weigh 420ml of NaOH solution with a mass concentration of 5%, mix and stir at 50°C for 10-15min until dissolved;

[0032] Step 2, adding 200 g of artificial graphite fine powder to the prepared mixed solution, the artificial graphite fine powder is subdivided by artificial graphite with a D50 of 10.7 μm, and stirred evenly by ultrasonic to form a suspension;

[0033] Step 3. When the temperature of the suspension is lower than 40°C, add 90g of epichlorohydrin, transfer the mixture to a four-necked flask, and turn on the stirrer to react. The reaction is divided into seven stages: 57±4°C for 15 minutes; 70 React at ±3°C for 15 minutes; at 80±3°C for 30 minutes; at 85±3°C for 10 minutes; at 90±3°C for 10 minutes; at 95±2°C for 20 minutes; at 97±2°C for 20 minutes to obtain the reaction product;

[0034] Step 4, washing the reaction product with water to neutrality and dehydration to obtain a hard carbon / graphite composite electrode ma...

Embodiment 3

[0037] Step 1. Weigh 150g of bisphenol A and weigh 1000ml of NaOH solution with a mass concentration of 2%, and mix and stir at 50°C for 10-15min until dissolved;

[0038] Step 2, adding 160g of artificial graphite fine powder to the prepared mixed solution, the artificial graphite fine powder is subdivided by artificial graphite with a D50 of 10.7 μm, stirred evenly by ultrasonic to form a suspension;

[0039] Step 3. When the temperature of the suspension is lower than 40°C, add 110g of epichlorohydrin, transfer the mixture to a four-necked flask, and start the stirrer to react. The reaction is divided into seven stages: 57±4°C for 15 minutes; 70 React at ±3°C for 15 minutes; at 80±3°C for 30 minutes; at 85±3°C for 10 minutes; at 90±3°C for 10 minutes; at 95±2°C for 20 minutes; at 97±2°C for 20 minutes to obtain the reaction product;

[0040] Step 4, washing the reaction product with water to neutrality and dehydration to obtain a hard carbon / graphite composite electrode mat...

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Abstract

The present invention relates to the technical field of lithium battery negative electrode materials, particularly to a hard carbon graphite composite negative electrode material preparation method, which comprises: (1) adding bisphenol A to a NaOH solution having a mass concentration of 1-10% at a temperature of less than 40 DEG C, and stirring for 10-15 min under a 50 DEG C room temperature condition until dissolving to obtain a mixed solution; (2) adding graphite powder into the mixed solution, and carrying out uniform ultrasonic stirring to form a suspension; (3) adding epichlorohydrin when the temperature of the suspension is lower than 40 DEG C, transferring into a four-necked flask, and carrying out a reaction to obtain a reaction product, wherein the reaction uses a three-step or a seven-step method; and (5) heating the precursor in a vacuum furnace to a temperature of 800-1300 DEG C at a rate of 5 DEG C / min, and carrying out thermal insulation for 1-24 h to obtain the finished product. Compared to the method in the prior art, the method of the present invention has the following advantages that the prepared negative electrode material has high discharge capacity and high initial charge-discharge efficiency.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium batteries, in particular to a method for preparing a hard carbon graphite composite negative electrode material. Background technique [0002] In the 21st century, the oil reserves on the earth are increasingly depleted, and the greenhouse effect of automobile exhaust emissions on the environment is becoming increasingly serious. In recent years, electric motor-driven electric vehicles (EVs) and hybrid electric vehicles (HEVs) that combine engines and electric motors have become the focus of research and development due to their ability to effectively utilize small and light lithium-ion batteries. Among them, hybrid electric vehicles are more economical and low fuel consumption. [0003] Hard carbon anode materials have attracted much attention due to their firm and stable macromolecular layer structure, which is more suitable for charging and discharging at high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/366H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 仲林谢秋生丁晓阳张鹏昌薄维通胡再冉
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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