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A surface modified carbon fluoride material and its method and application

A kind of fluorocarbon and fluorocarbon technology, which is applied in the field of surface modified fluorocarbon materials, can solve the defects of inability to overcome the initial voltage hysteresis, and it is difficult to greatly improve the discharge rate of lithium-carbon fluorocarbon batteries. High rate discharge performance and the effect of reducing voltage hysteresis

Active Publication Date: 2019-01-04
江苏超电新能源科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a mixture of fluorinated graphite and fluorinated carbon nanotubes as the positive electrode material of the battery can disperse the fluorinated carbon nanotubes around the fluorinated graphite particles, eliminate the high agglomeration of the fluorinated carbon nanotubes, and improve to a certain extent The phenomenon of obvious voltage hysteresis at the initial stage of battery discharge has improved the rate discharge performance of the lithium-carbon fluoride battery system, but since fluorinated graphite and fluorinated carbon nanotubes are both fluorinated series materials, they cannot overcome the fluorinated series The initial voltage hysteresis of the material itself makes it difficult to greatly increase the discharge rate of lithium-carbon fluoride batteries, which affects the wide application of carbon fluoride materials

Method used

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  • A surface modified carbon fluoride material and its method and application
  • A surface modified carbon fluoride material and its method and application
  • A surface modified carbon fluoride material and its method and application

Examples

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Embodiment 1

[0033] This embodiment provides a method for surface modification of carbon fluoride materials, comprising the following steps: mixing 0.2g ferric chloride, 4g carbon fluoride and 6g ethanol in a ball mill, the mixing time is 12h, and the mixing speed is 300 rpm; dry the mixture obtained by mixing, the drying time is 10h, and the drying temperature is 25°C; filter the dried mixture with a 100-325 mesh sieve, and collect powder with a particle size ranging from 0.0450mm to 0.150mm ;Put the filtered powder into an atmosphere furnace containing nitrogen, raise the temperature of the atmosphere furnace to 300°C at a rate of 5°C / min, and then calcine at a constant temperature for 5 hours; put the powder calcined at a constant temperature at a rate of 2°C / min Lower the temperature to 25°C; filter the cooled powder with a 100-325 mesh sieve, and collect the material with a particle size range of 0.0450 mm to 0.150 mm, which is the surface-modified carbon fluoride material.

Embodiment 2

[0035] This embodiment provides a method for surface modification of carbon fluoride materials, comprising the following steps: mixing 0.4g ferric chloride, 10g carbon fluoride and 14g ethanol in a ball mill, the mixing time is 12h, and the mixing speed is 200 rpm; dry the mixture obtained by mixing, the drying time is 10h, and the drying temperature is 30°C; filter the dried mixture with a 100-325 mesh sieve, and collect the powder with a particle size range of 0.0450mm to 0.150mm ;Put the filtered powder into an atmosphere furnace containing argon, raise the temperature of the atmosphere furnace to 450°C at a rate of 5°C / min, and then calcine at a constant temperature for 5 hours; cool the powder after constant temperature calcination at a rate of 10°C / min The rate is reduced to 25°C; the cooled powder is filtered with a 100-325 mesh sieve, and the material with a particle size range of 0.0450 mm to 0.150 mm is collected, which is the surface-modified carbon fluoride material...

Embodiment 3

[0037] This embodiment provides a method for surface modification of carbon fluoride materials, comprising the following steps: mixing 0.2g of ferric chloride, 0.5g of carbon fluoride and 1g of isopropanol in a ball mill for 24 hours, mixing The rotation speed of the machine is 100 rpm; the mixed mixture is dried, the drying time is 10 hours, and the drying temperature is 30°C; the dried mixture is filtered with a 100-400 mesh sieve, and the collected particle size ranges from 0.0374mm to 0.150 mm powder; put the filtered powder into an atmosphere furnace containing nitrogen, raise the temperature of the atmosphere furnace to 300°C at a rate of 3°C / min, and then calcine at a constant temperature for 24 hours; The cooling rate is reduced to 25°C; the cooled powder is filtered with a 100-325 mesh sieve, and the material with a particle size range of 0.0450 mm to 0.150 mm is collected, which is the surface-modified carbon fluoride material.

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Abstract

The invention relates to a surface-modified carbon fluoride material, and a method and application thereof. The method comprises the following steps of mixing ferric chloride, carbon fluoride and a solvent, wherein the mass ratio of the ferric chloride to the carbon fluoride to the solvent is (0.001 to 0.4):1:(1 to 2); drying a mixture obtained through mixing; filtering the dried mixture, and taking powder with the particle size range being 0.0374mm to 0.150mm; putting the powder obtained through filtering into an atmosphere oven containing inert atmosphere, warming the atmosphere oven to be 300 DEG C to 500 DEG C, and then calcining for 1h to 24h at constant temperature; cooling the mixture calcined at constant temperature to be 20 DEG C to 30 DEG C; filtering the cooled mixture, thus obtaining the mixture with the particle size range being 0.0450mm to 0.150mm, i.e., the surface-modified carbon fluoride material. According to the surface -modifiedcarbon fluoride material provided by the invention, voltage delay of the carbon fluoride can be effectively reduced, and high-rate discharge property of the carbon fluoride is improved.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to a surface-modified carbon fluoride material and its method and application. Background technique [0002] There are many kinds of lithium batteries, mainly including lithium-manganese dioxide batteries, lithium-thionyl chloride batteries, lithium-sulfur dioxide batteries, etc. The energy density can generally reach 250-350Wh / kg, and they have high specific energy and working voltage. In recent years, lithium-carbon fluoride batteries have attracted much attention due to their energy density of 700-800Wh / kg. However, due to the serious initial voltage hysteresis, poor high-rate discharge performance, heat release and expansion of fluorinated carbon materials, Finally, the effect of low-temperature and high-current discharge of the battery is reduced, which seriously affects the high-rate discharge performance of the battery, and restricts the techni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M6/14
CPCH01M4/364H01M4/5835H01M4/628H01M6/14
Inventor 王云峰姚晓青徐勇高洁
Owner 江苏超电新能源科技发展有限公司
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