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A kind of preparation technology of silicon carbon negative electrode of lithium battery

A preparation process, lithium battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor product quality, poor competitiveness of enterprises, low cost, etc., to achieve low manufacturing costs, large profit margins, and improve competitiveness Effect

Active Publication Date: 2019-12-06
优沃特科技(山西)有限公司
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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 silicon-carbon negative electrodes of lithium batteries. The process is simple and the cost is low, but the performance of the finished product can meet the current needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation process for a silicon-carbon negative electrode of a lithium battery, comprising the steps of:

[0035] S1. Raw materials, silicon powder, graphite powder, carbon nanotubes, modified coal tar pitch, titanium powder, acetylene black;

[0036] The fineness of the silicon powder, graphite powder and titanium powder is above 90 mesh, and the purity is 99.99%;

[0037] 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%;

[0038] S2. Take graphite powder, silicon powder, and carbon nanotubes according to the ratio of parts by weight of 6:3.6:2.4, and mix them evenly, then put them into a ball mill, use copper balls with a diameter of 5 mm as the grinding body, and then fill Inject nitrogen as a protective gas, and heat to 800°C for ball milling, cycle 35 times, ball milling time 12h, to obtain mixed fine material;

[0039] S3. Take out the mixed fine material, modified coal tar pitch, titani...

Embodiment 2

[0058] A preparation process for a silicon-carbon negative electrode of a lithium battery, comprising the steps of:

[0059] S1. Raw materials, silicon powder, graphite powder, carbon nanotubes, modified coal tar pitch, titanium powder, acetylene black;

[0060] The fineness of the silicon powder, graphite powder and titanium powder is above 90 mesh, and the purity is 99.99%;

[0061] 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%;

[0062]S2. Take graphite powder, silicon powder, and carbon nanotubes according to the ratio of parts by weight of 5.5:3.5:3.5, and mix them evenly, then put them into a ball mill, use copper balls with a diameter of 4 mm as grinding bodies, and then fill Inject nitrogen as a protective gas, and heat to 860°C for ball milling, cycle 35 times, ball milling time 14h, to obtain mixed fine material;

[0063] S3. Take out the mixed fine material, modified coal tar pitch, titaniu...

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Abstract

The invention discloses a preparation process of a lithium battery silicon-carbon negative electrode. According to the process, silicon powder, graphite powder, carbon nanotubes, modified coal tar pitch, titanium powder and acetylene black are adopted, and ball milling, heating calcination, mould pressing, roasting, impregnation, processing and other processes are carried out to manufacture the silicon-carbon negative electrode. The process is simple, and is low in manufacturing cost. The performance of the finished product is not weaker than that of the mainstream finished products on the market, or even superior to imported finished products. Therefore, the preparation process provided by the invention can bring greater profit margins to enterprises and improve the competitiveness of enterprises.

Description

technical field [0001] The invention relates to a manufacturing process of a negative electrode material of a battery, in particular to a preparation process of a silicon carbon negative electrode of a lithium battery. 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 method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/1395
CPCH01M4/1393H01M4/1395Y02E60/10
Inventor 武建军
Owner 优沃特科技(山西)有限公司