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Preparation method of mixed cathode material for lithium battery

A technology of mixing positive electrode materials and lithium batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that hinders the wide application of carbon fluoride materials, does not fundamentally solve the initial voltage hysteresis of carbon fluoride, and is difficult to greatly improve lithium - The discharge rate of fluorinated carbon batteries can improve the initial discharge voltage hysteresis, improve the high current discharge performance, and improve the low temperature discharge performance.

Active Publication Date: 2018-01-05
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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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 phenomenon of carbon fluoride itself, it is difficult to greatly increase the discharge rate of lithium-carbon fluoride batteries, hindering the wide application of carbon fluoride materials

Method used

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preparation example Construction

[0020] Preparation method of mixed positive electrode material for lithium battery, doping Ag in fluorinated carbon material 2 V 4 o 11 materials, the process of doping includes:

[0021] Step 1. Follow FFC: Ag 2 V 4 o 11 : The mass ratio of solvent=1:0.01-0.8:1.5-3, the carbon fluoride, Ag 2 V 4 o 11 and the solvent are put into a ball mill, mixed and ball milled at a speed of 100-500 rpm for 12-24 hours, and a mixed slurry is formed in the ball mill;

[0022] Step 2. Dry the mixed slurry at 60°C-120°C for 5-20h, and cool it down to room temperature naturally to obtain a dry mixture;

[0023] Step 3. After passing the dry mixture in step 2 through a 100-400 mesh sieve, the obtained powder is used as the mixed positive electrode material for the lithium battery of the present invention.

[0024] The solvent is one of ethanol, ethylene glycol, isopropanol or water.

[0025] The ball mill is an agate ball mill jar, and during ball milling, ball agate mill beads are pla...

Embodiment 1

[0027] Step 1. Take 0.2g Ag 2 V 4 o 11 As a doping material, put it into the agate ball mill jar as a ball mill together with 4g of carbon fluoride, then add 6g of ethanol, and put the ball agate into the agate ball mill jar according to the mass ratio of carbon fluoride and ball milling beads as 1:10 Grinding beads, the diameter of the ball milling beads is 5-15mm, and the materials in the agate ball milling tank are ball milled and mixed for 12 hours under the condition of 300 rpm to form a mixed slurry; by putting in ball agate grinding beads, the two materials can be better mixed Mix well to increase the mixing effect.

[0028] Step 2. Put the mixed slurry formed in step 1 into a drying oven, dry it at 80°C for 10 hours, take it out, and cool it down to room temperature of 25°C naturally to obtain a dry mixture;

[0029] Step 3. After passing the dried mixture in step 2 through a 300-mesh sieve, the obtained powder is used as the mixed positive electrode material for th...

Embodiment 2

[0031] Step 1. Take 0.28g of Ag 2 V 4 o 11 As a doping material, put 4g of carbon fluoride into the agate ball milling jar as a ball mill, then add 7g of ethanol, and then put balls into the agate ball milling jar according to the mass ratio of carbon fluoride and ball milling beads at a ratio of 1:10. Agate grinding beads, the diameter of ball agate grinding beads is in the range of 5-15mm, and the material in the agate ball milling tank is ball milled and mixed for 24h under the condition of 200 rpm to form a mixed slurry;

[0032] Step 2. Put the mixed slurry formed in step 1 into a drying oven, dry it at 80°C for 10 hours, take it out, and cool it down to room temperature of 25°C naturally to obtain a dry mixture;

[0033] Step 3. After passing the dried mixture in step 2 through a 200-mesh sieve, the obtained powder is used as the mixed positive electrode material for the lithium battery of the present invention.

[0034] The mixed positive electrode material prepared ...

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Abstract

The invention relates to a preparation method of a mixed anode material for a lithium battery. The preparation method is characterized by comprising the following steps: doping an Ag2V4O11 material into a carbon fluoride material, wherein the doping process comprises the step of placing carbon fluoride, Ag2V4O11 and a solvent into a ball mill to be milled to form mixed slurry; drying the mixed slurry, and cooling the dried slurry to obtain a dried mixture; screening the dried mixture to obtain the mixed anode material for the lithium battery. According to the preparation method disclosed by the invention, the Ag2V4O11 material is mixed with the carbon fluoride material, the two substances are mixed through an additive, and the Ag2V4O11 material is good in high-rate discharge performance, so that the initial voltage lagging problem of carbon fluoride can be solved, the discharge performance of carbon fluoride can be effectively improved, the high rate discharge of a lithium-carbon fluoride battery system can be greatly improved, the low-temperature heavy current discharge of the lithium-carbon fluoride battery can be improved, and the application range of the lithium-carbon fluoride battery system can be expanded.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a preparation method of a mixed positive electrode material for lithium batteries. 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 discharg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62
CPCH01M4/364H01M4/582H01M4/625H01M10/0525Y02E60/10
Inventor 丁飞孙文彬张晶
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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