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Preparation technology of lithium ion battery negative electrode material

A lithium-ion battery and preparation process technology, applied in the field of preparation process of lithium-ion battery anode materials, can solve problems such as poor competitiveness of enterprises, low yield, and poor product quality, and achieve low manufacturing costs, large profit margins, The effect of improving competitiveness

Active Publication Date: 2018-12-04
深圳博钠新能源科技有限公司
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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 lithium-ion battery anode materials, 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

[0022] A preparation process for lithium ion battery negative electrode material, comprising the steps of:

[0023] S1, adopting Hummers method to make graphene oxide from natural graphite;

[0024] S2. Put the zinc sulfide powder and sucrose into a ball mill, and ball mill for 1.5 hours to make the fineness not less than 100 mesh; the mass-number ratio of zinc sulfide powder to sucrose is: 1:1.2;

[0025] S3. Put the powder treated by S2 into a tube furnace, fill it with argon as a protective gas, and heat it to 800°C for 2.5 hours. The specific heating method is as follows:

[0026] Room temperature -400°C, 6°C / h, keep at 400°C for 2 hours;

[0027] 400-800°C, 4°C / h, keep at 800°C for 2.5 hours, then cool to room temperature in a tube furnace to obtain ZnS / C composite material;

[0028] S4. Take out the graphene oxide, sodium dodecylbenzenesulfonate, ZnS / C composite material, carbon nanotubes, and titanium dioxide prepared in S1 and mix them uniformly according to the weig...

Embodiment 2

[0035] A preparation process for lithium ion battery negative electrode material, comprising the steps of:

[0036] S1, adopting Hummers method to make graphene oxide from natural graphite;

[0037] S2. Put the zinc sulfide powder and sucrose into a ball mill, and ball mill for 2 hours to make the fineness not less than 100 mesh; the mass-number ratio of zinc sulfide powder to sucrose is: 1:1.3;

[0038] S3. Put the powder treated by S2 into a tube furnace, fill it with argon as a protective gas, and heat it to 800°C for 2-3 hours. The specific heating method is as follows:

[0039] Room temperature -400°C, 7°C / h, keep at 400°C for 1 hour;

[0040] 400-800°C, 3°C / h, keep at 800°C for 3 hours, then cool to room temperature in a tube furnace to obtain ZnS / C composite material;

[0041] S4. Take the graphene oxide, sodium dodecylbenzenesulfonate, ZnS / C composite material, carbon nanotubes, and titanium dioxide prepared in S1 and mix them uniformly according to the weight to wei...

Embodiment 3

[0048] A preparation process for lithium ion battery negative electrode material, comprising the steps of:

[0049] S1, adopting Hummers method to make graphene oxide from natural graphite;

[0050] S2. Put the zinc sulfide powder and sucrose into a ball mill, and ball mill for 1-2 hours to make the fineness not less than 100 mesh; the mass-number ratio of zinc sulfide powder and sucrose is: 1:1.1;

[0051] S3. Put the powder treated by S2 into a tube furnace, fill it with argon as a protective gas, and heat it to 800°C for 2-3 hours. The specific heating method is as follows:

[0052] Room temperature -400°C, 6°C / h, keep at 400°C for 2 hours;

[0053] 400-800°C, 4°C / h, keep at 800°C for 2 hours, then cool to room temperature in a tube furnace to obtain ZnS / C composite material;

[0054] S4. Take the graphene oxide, sodium dodecylbenzenesulfonate, ZnS / C composite material, carbon nanotubes, and titanium dioxide prepared in S1 and mix them uniformly according to the weight to w...

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Abstract

The invention discloses a preparation technology of a lithium ion battery negative electrode material. The preparation technology comprises the following steps: preparing graphene oxide; preparing a ZnS / C composite material; preparing fine powder; preparing a pre-matrix; taking out and uniformly mixing the pre-matrix, a graphite conductive agent and PVDF according to a weight part ratio of (90-95):(5-6):(6-7) to obtain a mixed fine material, heating the mixed fine material to 160-200 DEG C, adding the heated mixed fine material into a stirrer, and performing stirring at 160-200 DEG C for 4-6 h; adding N-methylpyrrolidone, and performing uniform stirring to make the obtained mixed material become a viscous slurry; smearing the slurry on a copper foil, and distributing the copper foil and the slurry at intervals to obtain an intermediate matrix; placing the intermediate matrix in a molding press, and performing compression molding under a pressure of 60-80 MPa at a compression rate of 0.8 or below in order to obtain a green body having a thickness of 20 mm or below; and cutting the green body according to a preset size, and drying the green body in a dryer at 120-150 DEG C for 10-12h to obtain the finished product. The technology has the advantages of simplicity and low manufacturing cost, and the performances of the finished product are not weaker than those of commercial mainstream finished products, and are even better than those of imported finished products.

Description

technical field [0001] The invention relates to a graphite negative electrode material, in particular to a preparation process of a lithium ion battery 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 method is to prepare graphite. However, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 郭志宏
Owner 深圳博钠新能源科技有限公司