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A kind of preparation method of graphene/sic composite negative electrode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of no further utilization of lignin and other components, unfavorable scale production, and high equipment requirements, and achieve significant economic and social benefits. , low cost and simple synthesis process

Active Publication Date: 2018-04-24
湖南镕锂新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain graphene with better quality, but in the synthesis process, a catalyst needs to be added, and the firing temperature is high
[0005] Chinese patent document CN 105439135A discloses a method for preparing graphene from lignin, which uses high temperature and high pressure to decompose lignin to obtain high-energy carbon atoms, and generates graphene under the action of a catalyst, although the firing temperature is lower than the former , but also need to add catalyst, and require high pressure conditions, high requirements for equipment, not conducive to large-scale production
Although the method uses grass papermaking black liquor to achieve effective utilization, it does not involve further utilization of lignin and other components

Method used

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  • A kind of preparation method of graphene/sic composite negative electrode material for lithium ion battery
  • A kind of preparation method of graphene/sic composite negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 50mL of papermaking black liquor, dry it at 70°C, heat the mixture powder under nitrogen atmosphere to 500°C for 60min, wash it with water three times after natural cooling, and dry it at 60°C to obtain the precursor mixture; The precursor was heated to 300°C for 60 minutes and 550°C for 90 minutes under nitrogen atmosphere, and then heated to 800°C for 240 minutes. After natural cooling, the graphene / SiC composite material was obtained. The XRD is as follows: figure 1 shown.

[0037] Electrochemical performance test

[0038] The composite material prepared in this embodiment was used as the negative electrode material of lithium ion battery, and the electrode was prepared by coating method. After the graphene / SiC composite material, acetylene black and polyvinylidene fluoride (PVDF) are thoroughly ground and mixed at a mass ratio of 80:10:10, add N-methylpyrrolidone solvent and stir evenly to obtain a viscous precoat Refining the slurry; coating the above slurry...

Embodiment 2

[0042]Take 50mL of papermaking black liquor, dry it at 50°C, heat the mixture powder under nitrogen atmosphere to 400°C for 180min, wash it with water three times after natural cooling, and dry it at 70°C to obtain the precursor mixture; The precursor was heated to 300°C for 120min and 550°C for 180min under a nitrogen atmosphere, then heated to 700°C for 480min, and cooled naturally to prepare graphene / SiC composites.

[0043] The half-cell composed of the composite material can be used within the voltage range of 0-3V and 1000mA g -1 Performance test under current density, its first discharge specific capacity is 181.9mAh g -1 , after 200 cycles, its discharge specific capacity is stable at 160mAhg -1 .

Embodiment 3

[0045] Take 50mL of papermaking black liquor, dry it at 80°C, heat the mixture powder under nitrogen atmosphere to 600°C for 30min, wash it with water three times after natural cooling, and dry it at 50°C to obtain the precursor mixture; The precursor was heated to 900 °C for 60 min under nitrogen atmosphere, and the graphene / SiC composite material was obtained after natural cooling.

[0046] The half-cell composed of the composite material can be used within the voltage range of 0-3V and 1000mA g -1 Performance test under current density, its first discharge specific capacity is 476.7mAh g -1 , after 200 cycles, its discharge specific capacity is stable at 140mAhg -1 .

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Abstract

The invention relates to a method for preparing a graphene / SiC composite negative electrode material for a lithium ion battery. According to the method, papermaking black liquid serves as a raw material, lignin, Si element and cellulose in the papermaking black liquid are fully utilized, and no catalyst needs to be added. Dried papermaking black liquid mixture undergoes heat treatment at low temperature, is washed and then undergo high temperature heat treatment, so that a graphene / SiC composite material excellent in electrochemical performance is obtained, and the graphene / SiC composite material can be used for the graphene / SiC composite negative electrode material. The method not only enables negative electrode material excellent in electrochemical performance to be provided and reduces production cost, but also can reduce environmental pollution and have remarkable economic and social benefits.

Description

technical field [0001] The invention relates to a graphene / SiC composite negative electrode material for lithium ion batteries and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Graphene has excellent electronic conductivity, large specific surface area, excellent thermal and mechanical properties, and the structure of graphene is very stable due to the good flexibility of the links between carbon atoms. Compared with carbon materials, silicon, as a lithium ion negative electrode material, has a high theoretical lithium storage capacity and is rich in resources. However, during the process of lithium intercalation and delithiation, the volume of silicon changes greatly. Pulverized, the capacity decays rapidly. Silicon carbide (SiC) combines the advantages of carbon anode materials and silicon-based materials, and has the advantages of high specific capacity and good cycle stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/0525
CPCH01M4/362H01M4/58H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 何文张旭东伊新丽
Owner 湖南镕锂新材料科技有限公司