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Surface finish method of carbon fluoride material

A technology of surface modification and carbon fluoride, applied in the field of surface modification of carbon fluoride materials, can solve the problems affecting the wide application of carbon fluoride materials, it is difficult to greatly improve the discharge rate of lithium-carbon fluoride batteries, and it does not fundamentally solve the problem of fluorine. The initial voltage hysteresis of carbonized carbon can improve the voltage hysteresis phenomenon, the high rate discharge and low temperature performance improvement, and the effect of uniform mixing.

Active Publication Date: 2015-04-29
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses a mixture of fluorinated graphite and fluorinated carbon nanotubes as the carbon fluorinated positive electrode material for batteries, so that the fluorinated carbon nanotubes are better dispersed around the fluorinated graphite particles, effectively eliminating the fluorinated carbon nanotubes. The high agglomeration of the battery improves the obvious voltage hysteresis phenomenon at the initial stage of battery discharge, and improves the rate discharge performance of the lithium-carbon fluoride battery system. However, since the materials used in the present invention are all fluorinated series materials, there is no Fundamentally solve the initial voltage hysteresis of carbon fluoride itself, it is 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 finish method of carbon fluoride material
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Experimental program
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Effect test

Embodiment 1

[0036] Step 1. Take 0.2g of nano-copper with a diameter of 10-100nm, add 4g of carbon fluoride into the agate ball mill jar and mix, then add 6g of ethanol, and grind the agate on the agate according to the mass ratio of carbon fluoride and ball agate grinding beads of 1:10 Put ball agate grinding beads in the ball milling tank, the diameter of the ball agate grinding beads is 5-15mm, and the materials in the agate ball milling tank are ball milled and mixed for 12h under the condition of 300 rpm to form a mixed slurry; through ball milling, it can be better Nano-copper and carbon fluoride are mixed evenly, which improves the mixing effect.

[0037] Step 2. Take out the mixed slurry formed in step 1, and dry it in the air at room temperature for 10 hours to form a mixture;

[0038] Step 3. After the mixture in step 2 is passed through a 300-mesh sieve, the mixture powder is obtained;

[0039] Step 4. Put the mixture powder into the atmosphere furnace. Under the nitrogen atmos...

Embodiment 2

[0042] Step 1. Take 0.4g of nano-copper with a diameter of 20-40nm, add 10g of carbon fluoride to the agate ball mill jar and mix them, then add 14g of ethanol, and grind the agate on the agate according to the mass ratio of carbon fluoride and ball agate grinding beads: 1:15 Put ball agate grinding beads in the ball milling tank, the diameter of the ball agate grinding beads is 5-15mm, the material in the agate ball milling tank is ball milled and mixed for 12h under the condition of 200 rpm to form a mixed slurry; through ball milling, it can be better Nano-copper and carbon fluoride are mixed to increase the mixing effect.

[0043] Step 2. Take out the mixed slurry formed in step 1, and dry it in the air at room temperature for 10 hours to form a mixture;

[0044] Step 3. After the mixture in step 2 is passed through a 300-mesh sieve, the mixture powder is obtained;

[0045] Step 4. Put the mixture powder into the atmosphere furnace. Under the argon atmosphere, the tempera...

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Abstract

The invention relates to a surface finish method of a carbon fluoride material. The method comprises the following steps: (1) mixing nanometer copper and carbon fluoride, then adding a solvent for ball milling so as to form a combined pulp; (2) drying the mixed pulp so as to form a mixture; (3) screening the mixture so as to obtain the powder mixture; (4) putting the powder mixture into an atmosphere oven so as to be calcined; (5) taking out the calcined powder mixture, lowering the temperature of the calcined powder mixture to the room temperature, and then screening the calcined powder mixture of which the temperature is lowered so as to form the carbon fluoride material modifies by the nanometer copper. According to the invention, the carbon fluoride and the nanometer copper with good conductivity are mixed, and after the mixture is calcined at a high temperature in an inert atmosphere, the nanometer copper reacts on the surface of the carbon fluoride, so that the phenomenon that the voltage of carbon fluoride is delayed is obviously improved, and high-ratio discharge and low temperature performance are greatly improved. The carbon fluoride with a finished surface, prepared by the method, is used as a positive material to be made into a lithium-carbon fluoride battery system, wherein the lithium-carbon fluoride battery system has the properties of high-ratio discharge and low temperature high-current discharge, so that the application range of the lithium-carbon fluoride battery system is extended.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and in particular relates to a method for surface modification of carbon fluoride materials. Background technique [0002] There are many kinds of metal lithium primary batteries with high specific energy and working voltage. At present, the relatively mature systems mainly include lithium-manganese dioxide batteries, lithium-thionyl chloride batteries, lithium-sulfur dioxide batteries, etc., and the energy density can generally reach 250-350Wh / kg. In recent years, lithium-carbon fluoride batteries have attracted much attention due to their higher energy density. However, due to the serious initial voltage hysteresis of fluorinated carbon materials, poor high-rate discharge performance, heat generation and expansion, etc., the effect of low-temperature and high-current discharge of the battery is finally reduced, which seriously affects the high-rate di...

Claims

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Application Information

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IPC IPC(8): H01M4/58B82Y40/00
CPCB82Y40/00H01M4/08H01M4/583
Inventor 丁飞孙文彬张晶
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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