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Fluorinated graphene modified niobium pentoxide material as well as preparation and application thereof

A technology of niobium pentoxide and graphene fluoride, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as battery performance degradation, poor electronic conductivity, and shedding.

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as we all know, the electronic conductivity of niobium pentoxide is very poor, and people often seek to compound it with conductive substrates to achieve the purpose of improving the electronic properties of the material.
However, as the charge-discharge cycle proceeds, the niobium pentoxide and the conductive substrate tend to fall off, and the performance of the battery decreases.

Method used

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  • Fluorinated graphene modified niobium pentoxide material as well as preparation and application thereof
  • Fluorinated graphene modified niobium pentoxide material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] After mixing 45g of ethanol, 2g of fluorinated graphene (F / C ratio of 1.1, 5 layers), and 2g of ammonia water until uniform, slowly add 50g of niobium chloride, stir for 5 hours, and evaporate the liquid to obtain the intermediate phase. Then calcined at 600°C for 8 hours under argon atmosphere, and made into powder material after cooling.

[0019] The above materials were subjected to elemental analysis, wherein the mass fraction of carbon element accounted for 10%, the mass fraction of fluorine element accounted for 5%, and the rest was niobium pentoxide.

[0020] The above materials were tested by XPS and peaks were divided, of which 670.5e V belonged to Nb-F bond, 686.6e V belonged to C-F bond, and 675.3e V belonged to C-F-Nb bond, which proved that fluorinated graphene modified niobium pentoxide material Contains C-F-Ti bonds, Ti-F bonds, and C-F bonds. These bonds are conducive to the compounding of niobium pentoxide and graphene fluoride on the atomic scale to gr...

Embodiment 2

[0033] After mixing 45g of methanol, 3g of fluorinated graphene (F / C ratio of 1.2, 4 layers), and 2g of ammonia water until uniform, slowly add 50g of niobium fluoride, stir for 4.5 hours, and evaporate the liquid to obtain the intermediate phase. Then calcined at 800°C for 6 hours under nitrogen atmosphere, and made into powder material after cooling.

[0034] The above materials are used for electrode preparation and battery testing. The conditions for electrode preparation and battery testing are shown in the table.

Embodiment 3

[0036] Mix 80 g of isopropanol, 2.7 g of ammonia water, and 3 g of fluorinated graphene (F / C ratio of 1.1, 5 layers) until uniform, then slowly add 100 g of niobium bromide, stir for 3 hours, and evaporate the liquid to obtain intermediate Mutually. Then it was calcined at 500°C for 10 hours under an argon atmosphere, and it was cooled to make a powder material.

[0037] The above materials are used for electrode preparation and battery testing. The conditions for electrode preparation and battery testing are shown in the table.

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Abstract

The invention provides a fluorinated graphene modified niobium pentoxide material as well as a preparation method and application thereof. The fluorinated graphene modified niobium pentoxide materialis formed by compounding fluorinated graphene and niobium pentoxide, wherein niobium pentoxide accounts for 55%-98% of the mass fraction of the whole material, preferably 62%-97%, and the best 70%-94%; C-F-Nb bonds and F-Nb bonds are contained on the surface of the material, niobium pentoxide accounts for 55%-98% of the mass fraction of the whole material, the carbon element accounts for 1%-25% ofthe mass fraction of the whole material, and the fluorine element accounts for 0.2%-20% of the mass fraction of the whole material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries and lithium ion supercapacitors, and in particular relates to a modified niobium oxide-free negative electrode and a preparation method thereof. Background technique [0002] The transition metal oxide niobium pentoxide has a suitable working potential (1-2V), and its unique crystal structure can provide abundant storage sites for lithium ions, while the orthorhombic Nb 2 o 5 Because its octahedral voids can provide special ion channels, which help to improve the charging and discharging speed of the battery. [0003] However, as we all know, the electronic conductivity of niobium pentoxide is very poor, and people often seek to compound it with conductive substrates to achieve the purpose of improving the electrons of the material. However, as the charge-discharge cycle proceeds, the niobium pentoxide and the conductive substrate tend to fall off, and the performance of the battery decrease...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/58
CPCH01M4/364H01M4/48H01M4/58Y02E60/10
Inventor 曲超张洪章李先锋张华民刘翠连
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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