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Carbon fluoride for lithium battery anode material

A positive electrode material, the technology of using carbon fluoride, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low volume specific energy, serious material agglomeration, and high binder ratio of lithium fluoride batteries, and achieve fast Promote migration and conduction, reduce electrical insulation, and improve transfer effects

Inactive Publication Date: 2012-02-22
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, fluorinated carbon nanotubes are used alone as the positive electrode material of the battery. Since the material is a two-dimensional nanostructure, the material has serious agglomeration and low density. Low, the volume specific energy of the prepared lithium carbon fluoride battery is too low

Method used

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  • Carbon fluoride for lithium battery anode material
  • Carbon fluoride for lithium battery anode material
  • Carbon fluoride for lithium battery anode material

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preparation example Construction

[0018] The preparation steps of the present invention comprise:

[0019] (1) Select raw materials:

[0020] Choose fluorinated graphite CF with X=0.9~1.0 X and X=0.9~1.1 fluorinated carbon nanotube CF X ;

[0021] (2) Preparation of carbon fluoride materials for lithium battery cathode materials:

[0022] In the step (1) where the mass ratio range is 6:4 to 9.5:0.5, graphite fluoride CF X and fluorinated carbon nanotubes CF X Put it in a ball mill for ball milling and mixing, and the mixing time is 2 to 3 hours, which is conducive to breaking the agglomeration between carbon nanotubes and improving their dispersibility in graphite fluoride. carbonized material.

Embodiment 1

[0024] Graphite fluoride CF with a mass ratio of 8:2 X , where: X=0.9~1.0 and fluorinated carbon nanotube CF X , wherein: X=0.9~1.1, placed in a ball mill for 2~3 hours of ball milling and mixing, after taking out, the carbon fluoride material for lithium battery positive electrode material of the present invention is made; select 75-90 grams of carbon fluoride material of the present invention , mixed with 5-15 grams of acetylene black or SuperP conductive agent, 5-10 grams of polyvinylidene fluoride adhesive in a mixer for 3 to 5 hours to form a slurry; apply the mixed slurry on 0.02 On aluminum foil with a thickness of mm, dry it at 100-120°C for 0.5-1 hour, reduce the thickness of the roll by 20%-40%, tailor the electrode to the corresponding size as required, and pair the electrode with metal lithium to prepare a lithium fluoride battery.

Embodiment 2

[0026] Graphite fluoride CF with a mass ratio of 9:1 X , where: X=0.9~1.0 and fluorinated carbon nanotube CF X , wherein: X=0.9~1.1, placed in a ball mill for 2~3 hours of ball milling and mixing, after taking out, the carbon fluoride material for lithium battery positive electrode material of the present invention is made; select 75-90 grams of carbon fluoride material of the present invention , mixed with 5-15 grams of acetylene black or Super P conductive agent, 5-10 grams of polyvinylidene fluoride adhesive in a mixer for 3 to 5 hours to form a slurry; apply the mixed slurry on On 0.02mm thick aluminum foil, dry at 100-120°C for 0.5-1 hour, reduce the thickness of rolling by 20%-40%, tailor electrodes of corresponding sizes according to needs, and pair electrodes with metal lithium to prepare lithium carbon fluoride batteries .

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Abstract

The invention relates to carbon fluoride for a lithium battery anode material, which comprises carbon fluoride, and is characterized in that the carbon fluoride is a mixture of graphite fluoride CFX and carbon fluoride nanotubes CFX, and the weight ratio of the graphite fluoride CFX to the carbon fluoride nanotubes CFX ranges from 6:4 to 9.5:0.5. By utilizing the mixture of the graphite fluoride CFX and the carbon fluoride nanotubes CFX as the carbon fluoride anode material for a lithium battery, the carbon fluoride for the lithium battery anode material enables the carbon fluoride nanotube materials to be better dispersed around graphite fluoride particles, so that high aggregation of the carbon fluoride nanotube materials is effectively eliminated. Moreover, by the aid of facilitation of the carbon fluoride nanotubes on quick transfer and conductivity of electrons and lithium ions, transfer of the electrons among material particles is accelerated, the tap density of the integral material is increased, the electric insulativity of the graphite fluoride is weakened, obvious voltage hysteresis in the initial period of battery discharge is substantially improved, and the rate discharge performance of a lithium carbon fluoride battery system is enhanced.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a carbon fluoride used for lithium battery cathode materials. Background technique [0002] Lithium primary batteries are a high-performance chemical power source widely used today. Lithium primary batteries have high specific energy and operating voltage. Lithium primary batteries are currently widely used, including lithium-manganese dioxide battery systems, lithium-sulfur dioxide battery systems and Lithium-thionyl chloride battery system, wherein the specific energy of the lithium-manganese dioxide battery system exceeds 250Wh / kg, and the working voltage is greater than 2V. The preparation of lithium primary batteries mostly uses solid positive electrode materials, because this kind of material is relatively easy to store and the electrode preparation process is simple, so it has always been the object of research. Carbon fluoride (CF) for the p...

Claims

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Application Information

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IPC IPC(8): H01M4/583
CPCY02E60/10
Inventor 张晶丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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