A kind of method that utilizes selenium graphene composite material to prepare lithium ion negative electrode material
A technology of negative electrode material and composite material, which is applied in the field of preparing lithium ion negative electrode material by using selenium graphene composite material, can solve the problems of low tap density, low tap density and low discharge capacity of natural graphite, and improve the graphitization process. Process, charge and discharge capacity increase, the effect of increasing the gram capacity
Inactive Publication Date: 2021-01-15
DATONG XINCHENG NEW MATERIAL CO LTD
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Problems solved by technology
[0003] Natural graphite has the characteristics of low tap density and high specific surface area, so it is not ideal as a raw material for preparing negative electrode materials
[0004] Ordinary artificial graphite has disadvantages such as high specific surface area, low tap density, poor particle shape, and low discharge capacity. It is not suitable to be directly used as the conditions for preparing negative electrode materials. If it is necessary to use this type of artificial graphite, it must be restructured. The stability of graphite structure Improvement cannot be guaranteed, but also increases production costs
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0038]The present invention will be further described below in conjunction with examples:
[0039]The raw materials and requirements selected in this embodiment are as follows:
[0040]The particle size D50 of selenium powder is 2-8μm;
[0041]Graphene purity: 99.0 wt%;
[0042]The particle size D50 of conductive carbon black is 2-5μm;
[0043]After many experiments, research and analysis, and product trial production, the inventor finally determined the particle size in the raw material selection side:
[0044]1.00
[0045]0.55
[0046]0.35
[0047]0.15<45wt% graphene with particle size ≤0.10μm as raw material;
[0048]The softening point of the medium temperature coal tar pitch of the coating material is 83-90℃, the coking value is ≥48%, the ash content is ≤0.20%, the toluene insoluble matter is ≤3%, the quinoline insoluble matter is ≤0.20%, and the volatile matter is 60-70%; This design is beneficial to improve the p...
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Abstract
The invention discloses a method for preparing a lithium ion negative electrode material by using a selenium graphene composite material, which adopts selenium powder, graphene powder and conductive carbon black; The coating material is medium temperature coal tar pitch, which is obtained by milling, primary graphitization purification, coating, extrusion, carbonization, secondary graphitization purification and pulse classification. The material prepared by the invention has the advantages of reduced rigidity and high compaction density, and the structural material is conducive to the intercalation and separation of lithium ions, further improves the gram capacity of the negative electrode material, and increases the charge and discharge capacity of the battery. The preparation method adopted by the invention improves the graphitization process technology, carries out deep graphitization purification, is different from simple surface catalytic graphitization, and the battery made of the material has high comprehensive performance. The negative electrode material of the lithium ion battery prepared by the selenium graphene composite material is stable in structure.
Description
Technical field[0001]The invention relates to a graphite material, in particular to a method for preparing a lithium ion negative electrode material by using a selenium-graphene composite material.Background technique[0002]With the continuous advancement of technology, people have put forward higher requirements for lithium-ion batteries. Lithium-ion batteries with high energy density, high rate performance, long cycle life, and high safety factor have gradually become a research hotspot. Graphite is currently the main commercial carbon anode material for lithium-ion batteries. Lithium-ion batteries have been widely used in various portable electronic products, power tools, and energy storage devices due to their high energy density, safety and stability, green efficiency, and no memory effect. Compared with traditional lead-acid and nickel-cadmium secondary batteries, lithium-ion batteries have the advantages of high working voltage, high specific energy, wide working temperature r...
Claims
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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 闵洁张培林庞中海武建军刘伟凯纪永良雷涛霍有
Owner DATONG XINCHENG NEW MATERIAL CO LTD