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Carbon fluoride material surface modification method and product and application thereof

A surface modification, carbon fluoride technology, applied in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of inability to overcome the initial voltage hysteresis, and it is difficult to greatly improve the discharge rate of lithium-carbon fluoride batteries. , to achieve the effect of improving high-rate discharge performance and reducing voltage hysteresis

Inactive Publication Date: 2016-12-14
江苏超电新能源科技发展有限公司
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  • 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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  • Carbon fluoride material surface modification method and product and application thereof
  • Carbon fluoride material surface modification method and product and application thereof
  • Carbon fluoride material surface modification method and product and application thereof

Examples

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Embodiment 1

[0031] This embodiment provides a method for surface modification of carbon fluoride materials, comprising the steps of: putting 0.2 g of carbon fluoride into 20 g of ethanol solution containing hydrazine, wherein the mass percentage of hydrazine is 2%, and the React for 24 hours, and continue to stir at a rate of 10 rpm during the reaction; filter the product obtained by the reaction, and collect the filter residue; wash the filter residue with ethanol, wherein the mass ratio of the filter residue to the solvent is 3:100; The product was dried under a nitrogen atmosphere at 60°C, and the dried material was the surface-modified carbon fluoride material.

Embodiment 2

[0033] This example provides a method for surface modification of carbon fluoride materials, including the following steps: put 0.2 g of carbon fluoride into 1 g of pure hydrazine solution, react at 100 ° C for 5 hours, and continue to use 60 Stir at a speed of rpm; filter the product obtained from the reaction, and collect the filter residue; wash the filter residue with acetone, and the mass ratio of the filter residue to the solvent is 20:100; dry the washed product under an argon atmosphere at 120°C , the substance after drying is the surface-modified carbon fluoride material.

Embodiment 3

[0035] This embodiment provides a method for surface modification of carbon fluoride materials, comprising the following steps: putting 0.2 g of carbon fluoride into 4 g of an aqueous solution containing hydrazine, wherein the mass percentage of hydrazine is 11%, and reacting at 60° C. 12h, in the process of reaction, continue to stir with the speed of 30 rpm; The product obtained by reaction is filtered, collect filter residue; Filter residue is washed with water, and the mass ratio of filter residue and solvent is 10:100; The product after washing is in Drying under a nitrogen atmosphere at 90°C, the dried material is the surface-modified carbon fluoride material.

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Abstract

The invention relates to a carbon fluoride material surface modification method and a product and application thereof. The surface modification method comprises the following steps: putting carbon fluoride in a pure hydrazine solution or a solution containing hydrazine, and reacting for 5-24 hours at the temperature of 25-100 DEG C, wherein the mass ratio of the carbon fluoride to the hydrazine is 1:1.55-1:5; filtering a product obtained through the reaction, collecting a filter residue, washing the filter residue by using a solvent, and drying the washed product under an inert atmosphere, wherein the dried matter is a surface modified carbon fluoride material. The surface modified carbon fluoride material provided by the invention effectively reduces the voltage delay of the carbon fluoride and greatly improves the high-rate discharge performance of the carbon fluoride.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to a method for surface modification of carbon fluoride materials and its products and applications. 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, an...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/052
CPCH01M4/5835H01M10/052Y02E60/10
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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