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Preparation method for carbon nano-sheet matrix material and application of carbon nano-sheet matrix material in sodium-ion battery

A technology of carbon nanosheets and matrix materials is applied in the field of sodium ion batteries to achieve the effects of shortening transmission distance, cheap and readily available raw materials, and improving sodium storage performance.

Active Publication Date: 2017-03-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the existing problems of negative electrode materials for sodium ion batteries, an object of the present invention is to propose a method for preparing a matrix material of low graphitized carbon nanosheets with moderate layer spacing, large specific surface area, abundant reactive sites, and low graphitization. Easy to obtain raw materials, low cost, green and environmental protection, high controllability, good repeatability, easy to realize industrial production

Method used

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  • Preparation method for carbon nano-sheet matrix material and application of carbon nano-sheet matrix material in sodium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add lignin, resorcinol, formaldehyde and sodium carbonate to deionized water in turn, the concentration of sodium carbonate in the solution is 0.1mol / L; the concentration of lignin is 1g / L; the concentration of resorcinol is 1g / L, and the concentration of formaldehyde 2g / L, stir evenly, the temperature of the mixed solution is 50°C, and the holding time is 10h to obtain lignin gel. Put 2g of lignin gel in a quartz tube furnace, protected by inert gas, and the heating rate is 5°C / min. Heat at 600°C for 1 hour to obtain gel carbide; mix 0.5g of gel carbonized product with 2g of magnesium chloride evenly, place in a quartz tube furnace, protect with inert gas, heat up at a rate of 5°C / min to 700°C, and hold for 1 hour , the obtained material is washed and dried to obtain a low graphitized carbon nanosheet matrix material, the thickness of the carbon nanosheet is concentrated at 50nm, and the specific surface area of ​​the obtained carbon nanosheet matrix material is 2000m ...

Embodiment 2

[0036] Add lignin, resorcinol, formaldehyde and sodium carbonate to deionized water in sequence, the concentration of sodium carbonate in the solution is 0.15mol / L; the concentration of lignin is 2g / L; the concentration of resorcinol is 2g / L, and the concentration of formaldehyde 5g / L, stir evenly, the temperature of the mixed solution is 60°C, and the holding time is 20h to obtain lignin gel. Put 2g of lignin gel in a quartz tube furnace, protected by inert gas, and the heating rate is 3°C / min. Heat at 1000°C for 1 hour to obtain gel carbide; mix 0.5g of gel carbonized product with 2g of magnesium chloride evenly, place in a quartz tube furnace, protect with inert gas, heat up at a rate of 5°C / min to 900°C, and hold for 1 hour , the obtained material is washed and dried to obtain a low graphitization carbon nanosheet matrix material, the thickness of the carbon nanosheet is concentrated at 30nm, and the specific surface area of ​​the obtained carbon nanosheet matrix material i...

Embodiment 3

[0039] Add lignin, resorcinol, formaldehyde and sodium carbonate to deionized water in turn, the concentration of sodium carbonate in the solution is 0.2mol / L; the concentration of lignin is 5g / L; the concentration of resorcinol is 1g / L, and the concentration of formaldehyde 4g / L, stir evenly, the temperature of the mixed solution is 90°C, and the holding time is 40h to obtain lignin gel. Put 2g of lignin gel in a quartz tube furnace, protected by inert gas, and the heating rate is 2°C / min To 800°C, keep warm for 2 hours to obtain gel carbide; mix 0.5g gel carbonized product with 1.5g magnesium chloride evenly, place in a quartz tube furnace, protect with inert gas, heat up at a rate of 5°C / min to 800°C, keep warm 1h, the obtained material is washed and dried to obtain a low graphitization carbon nanosheet matrix material, the thickness of the carbon nanosheet is concentrated at 75nm, and the specific surface area of ​​the obtained carbon nanosheet matrix material is 1700m 2 / ...

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Abstract

The invention discloses a preparation method for a carbon nano-sheet matrix material and an application of the carbon nano-sheet matrix material in a sodium-ion battery. The method comprises the following steps: adopting lignin, resorcinol, formaldehyde and sodium carbonate for preparing a lignin gel according to a solution method; carbonizing the lignin gel at 400-1600 DEG C; activating with magnesium chloride at 600-1000 DEG C, thereby acquiring the carbon nano-sheet matrix material. The method has the advantages that the raw materials are easily acquired, the preparation process is simple and the repeatability is high. The prepared carbon nano-sheet matrix material has the advantages of low degree of graphitization, regular sheet structure, large specific area, abundant reaction active sites, moderate interlayer spacing, high electrical conductivity, and the like. When the carbon nano-sheet matrix material is applied to the sodium-ion battery, an excellent battery performance can be presented.

Description

technical field [0001] The invention relates to a method for preparing a carbon material, in particular to a method for preparing a carbon nanosheet matrix material and its application in a sodium ion battery, belonging to the field of sodium ion batteries. Background technique [0002] Sodium-ion batteries have become a research hotspot in the new generation of secondary battery systems due to their rich sodium reserves and the advantages of existing battery achievements. However, the high negative electrode voltage of sodium-ion batteries and the large radius of sodium ions pose many difficulties for the development of high-efficiency sodium-ion batteries. Electrode materials determine important parameters such as battery capacity, operating voltage, and cycle life. Although the reaction mechanism in sodium-ion batteries is similar to that in lithium-ion batteries, however, sodium ions are about 55% larger than lithium ions, and the intercalation and diffusion of sodium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/30C01B32/348H01M4/587H01M10/054B82Y30/00
CPCB82Y30/00C01P2004/03C01P2004/64C01P2006/12C01P2006/40H01M4/587H01M10/054Y02E60/10
Inventor 张治安陈玉祥李劼吴志星郭坚谢崇亮车袁航
Owner CENT SOUTH UNIV
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