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A preparation process of hard carbon composite negative electrode material for lithium battery

A technology for preparation process and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor competitiveness, low yield, and poor product quality of enterprises, and achieve improved competitiveness, large profit margins, and manufacturing costs. low effect

Inactive Publication Date: 2018-12-07
DATONG XINCHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The most common method is to prepare graphite. However, the manufacturing process of battery anode materials is very mature and diversified at present, and the performance of the finished product is relatively high. However, the manufacturing processes of each manufacturer are kept secret or protected by patents. In the field of manufacturing negative electrode materials, it is necessary to design a new manufacturing process that is different from the existing technology
[0004] However, the self-designed manufacturing process is either complicated in process and low in yield, resulting in rising costs and making the company lose competitiveness; or poor product quality, making the company less competitive
[0005] Therefore, the applicant proposes a preparation process for lithium battery hard carbon composite negative electrode material. The process is simple and the cost is low, but the performance of the finished product can meet the current demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation process for a lithium battery hard carbon composite negative electrode material, comprising the steps of:

[0019] S1, raw materials, sodium polyacrylate, sucrose-based hard carbon powder, carbon nanotubes, graphite powder, acetylene black, PVDF, methylpyrrolidone;

[0020] The fineness of the sodium polyacrylate, sucrose-based hard carbon powder, carbon nanotubes, graphite powder, and acetylene black is more than 90 mesh, and the purity is 99.99%;

[0021] The softening point of the modified coal tar pitch is 100-120°C, the coking value is ≥55%, and the ash content is ≤0.15%;

[0022] S2. Take out sucrose-based hard carbon powder, carbon nanotubes, and graphite powder according to the ratio of parts by weight of 11:2.5:3.4, mix them evenly, and then put them into a ball mill, using copper balls with a diameter of 4 mm as the grinding body , and then filled with nitrogen as a protective gas, and heated to 800 ° C for ball milling, 35 cycles, ball milling ...

Embodiment 2

[0027] A preparation process for a lithium battery hard carbon composite negative electrode material, comprising the steps of:

[0028] S1, raw materials, sodium polyacrylate, sucrose-based hard carbon powder, carbon nanotubes, graphite powder, acetylene black, PVDF, methylpyrrolidone;

[0029] The fineness of the sodium polyacrylate, sucrose-based hard carbon powder, carbon nanotubes, graphite powder, and acetylene black is more than 90 mesh, and the purity is 99.99%;

[0030] The softening point of the modified coal tar pitch is 100-120°C, the coking value is ≥55%, and the ash content is ≤0.15%;

[0031] S2. Take out sucrose-based hard carbon powder, carbon nanotubes, and graphite powder according to the ratio of parts by weight of 12:2:4, mix them evenly, and then put them into a ball mill, using copper balls with a diameter of 4 mm as the grinding body , and then filled with nitrogen as a protective gas, and heated to 850 ° C for ball milling, 40 cycles, ball milling time...

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PUM

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Abstract

The invention discloses a preparation process of a hard carbon composite negative electrode material of a lithium battery, comprising the following steps: S1, raw materials; S2, the sucrose-based hardcarbon powder, carbon nanotubes, graphite powder in parts by weight ratio of 10-12: - 3: 3-4, mix well, then put into ball mill, take copper ball as grinding body, and heat to 700-900 deg c for ballmilling and 30-40 times, ball milling time 10-15h to obtain mix fine material; S3, mixing the fine material, PVDF and acetylene black according to the weight part ratio of 40-50: - 6: 2-3 and mix well, then heat to 160-200 DEG C and place in a mixer to maintain 160-200 Deg C., stiring for 46h; Then, methyl pyrrolidone is added and stirred uniformly to make the mixed material viscous; S4, the material prepared by S3 is sandwiched between two layers of copper foil in a mold, then put into a mold press, and is passed through 60- 80 MPa pressure molding to obtain green compact; S5, cutting the green blank, then putting the blank into the dryer, passing through Drying at 120-150 deg c for 10-12 hours.

Description

technical field [0001] The invention relates to a manufacturing process of a battery negative electrode material, in particular to a preparation process of a lithium battery hard carbon composite negative electrode material. Background technique [0002] The negative pole refers to the end of the power supply with a lower potential (potential). In a primary battery, it refers to the electrode that oxidizes, and it is written on the left in the battery reaction. From a physical point of view, it is a pole from which electrons flow out of the circuit. The negative electrode material refers to the raw material that constitutes the negative electrode in the battery. At present, the common negative electrode materials include carbon negative electrode materials, tin-based negative electrode materials, lithium-containing transition metal nitride negative electrode materials, alloy negative electrode materials and nanoscale negative electrode materials. [0003] The most common m...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/625Y02E60/10
Inventor 马兴华
Owner DATONG XINCHENG NEW MATERIAL CO LTD