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Surface-modified carbon fluoride material, and method and application thereof

A kind of fluorinated carbon and fluorinated carbon technology, applied in the field of surface modified fluorinated carbon materials, can solve the problems that it is difficult to greatly increase the discharge rate of lithium-carbon fluoride batteries, and cannot overcome the defects of initial voltage hysteresis. Large rate discharge performance, the effect of reducing voltage hysteresis

Active Publication Date: 2017-02-08
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

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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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  • Surface-modified carbon fluoride material, and method and application thereof
  • Surface-modified carbon fluoride material, and method and application thereof
  • Surface-modified carbon fluoride material, and method and application thereof

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Embodiment 1

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

Embodiment 2

[0035] This embodiment provides a method for surface modification of carbon fluoride materials, which includes the following steps: 0.4g of ferric chloride, 10g of carbon fluoride and 14g of ethanol are mixed in a ball mill, the mixing time is 12h, and the mixing speed is 200 rpm; dry the mixed mixture, the drying time is 10h, and the drying temperature is 30℃; the dried mixture is filtered through a 100-325 mesh sieve, and the powder with a particle size range of 0.0450mm~0.150mm is collected ; Put the filtered powder into an atmosphere furnace containing argon, raise the atmosphere furnace to 450°C at a heating rate of 5°C / min, and then calcinate at a constant temperature for 5 hours; cool the temperature-calcined powder at a temperature 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 ranging from 0.0450mm to 0.150mm is collected, which is the fluorocarbon material after surface modificatio...

Embodiment 3

[0037] This embodiment provides a method for surface modification of carbon fluoride materials, including the following steps: mixing 0.2 g of ferric chloride, 0.5 g of carbon fluoride, and 1 g of isopropanol in a ball mill. The mixing time is 24 hours. The speed of the mixture is 100 rpm; the mixed mixture is dried, the drying time is 10h, and the drying temperature is 30℃; the dried mixture is filtered with a 100-400 mesh sieve, and the collected particle size range is 0.0374mm~0.150 mm powder; put the filtered powder into an atmosphere furnace containing nitrogen, raise the atmosphere furnace to 300°C at a heating rate of 3°C / min, and then calcinate at a constant temperature for 24h; the powder after constant temperature calcination is heated at 2°C / min 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 ranging from 0.0450mm to 0.150mm is collected, which is the surface-modified fluorocarbon mate...

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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 lithium battery cathode materials, in particular to a surface modified carbon fluoride material and its method and application. Background technique [0002] There are many types of lithium batteries, mainly lithium-manganese dioxide batteries, lithium-thionyl chloride batteries, lithium-sulfur dioxide batteries, etc. The energy density can generally reach 250-350Wh / kg, and it has 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 of fluorinated carbon materials, the poor performance of large-rate discharge, heat generation and expansion, etc. Finally, it reduces the battery's low-temperature high-current discharge effect, seriously affects the battery's high-rate discharge performance, and to a large extent restricts the technical developme...

Claims

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Application Information

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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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