Preparation method of graphene-multi-element metal positive electrode material

A cathode material and multi-metal technology, which is applied in the field of graphene-multi-metal cathode material preparation, can solve problems such as accelerated electrolyte decomposition, and achieve the effects of long service life, high specific capacity, improved electrical conductivity and cycle stability

Inactive Publication Date: 2014-05-21
詹炳辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li-Mn-O and Li-Ni-Co-O materials are slightly better than Li-Co-O when they are overcharged, but the Mn or Ni ions produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Embodiment one

[0021] The chemical formula of the multi-element metal cathode material is Li 0.8 Mg 0.2 mn 0.9 Al 0.1 co 0.95 Zr 0.05 o 4 According to the molar weight of Li, Mg, Mn, Al, Co, Zr in the above chemical formula, lithium hydroxide, magnesium oxide, manganese oxide, aluminum hydroxide, cobalt oxide and zirconium oxide were weighed, mechanically mixed, and placed in a planetary ball mill Ball mill at a speed of 400r / min for 8 hours; after ball milling, put it in a vacuum dryer and dry at a temperature of 150°C for 18 hours to obtain a powder, and crush the obtained powder with a crushing equipment; put the crushed powder in a reducing atmosphere furnace at 900 Sintering at a temperature of ℃ for 6h to obtain a multi-element metal positive electrode material.

[0022] Weigh graphite and potassium permanganate according to the mass ratio of 1:3, first add graphite to the mixed solution of 95wt% concentrated sulfuric acid and 60wt% concentrated nitric ac...

Example Embodiment

[0025] Embodiment two

[0026] The chemical formula of the multi-element metal cathode material is Li 0.75 Mg 0.25 mn 0.7 Al 0.3 co 0.9 Zr 0.1 o 4 According to the molar weight of Li, Mg, Mn, Al, Co, Zr in the above chemical formula, lithium hydroxide, magnesium oxide, manganese oxide, aluminum hydroxide, cobalt oxide and zirconium oxide were weighed, mechanically mixed, and placed in a planetary ball mill Ball mill at a speed of 500r / min for 6 hours; after ball milling, place in a vacuum dryer and dry at 200°C for 12 hours to obtain powder, and crush the obtained powder with a crushing equipment; place the crushed powder in a reducing atmosphere furnace at 1000 Sintering at a temperature of ℃ for 5h to obtain a multi-element metal positive electrode material.

[0027] Weigh graphite and potassium permanganate according to the mass ratio of 1:5, first add graphite to the mixed solution of 95wt% concentrated sulfuric acid and 60wt% concentrated nitric acid with a volume ...

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PUM

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Abstract

The invention relates to a preparation method of a graphene-multi-element metal positive electrode material. The method comprises the following steps: (1) weighing lithium hydroxide, magnesium oxide, manganese oxide, aluminium hydroxide, cobaltous oxide and zirconia according to the molar weights of Li, Mg, Mn, Al, Co and Zr in the chemical formula of Li(1-x)MgxMn(1-y)AlyCo(1-z)ZrzO4, wherein x is equal to 0.2-0.25, y is equal to 0.1-0.3, and z is equal to 0.05-0.1, mechanically mixing, carrying out ball milling, and drying so as to obtain powder, crushing, and sintering so as to obtain the multi-element metal positive electrode material; (2) preparing powdery graphene; and (3) mixing the powdery graphene and a polyethylene glycol solution, ultrasonically dispersing the mixture into ethyl alcohol to form a conductive graphene dispersive liquid; mixing the multi-element metal positive electrode material with the conductive graphene dispersive liquid, carrying out ball milling, drying, and sintering so as to prepare the graphene-multi-element metal positive electrode material. According to the graphene-multi-element metal positive electrode material prepared by the invention, active substances are formed by utilizing the multi-element metal material, and the surface of the graphene-multi-element metal positive electrode material is coated with a graphene material prepared by a specific method, and the activity and the stability of the material are improved.

Description

Technical field [0001] The invention relates to a preparation method of a graphene-multiple metal cathode material. Background technique [0002] With the rapid development of the battery industry, in order to solve many problems such as battery life, energy density, self-discharge or quality, various types of batteries have emerged. At present, due to the advantages of high energy density, long service life, light weight, and small self-discharge, lithium batteries have become the preferred power source for portable devices such as communication equipment and notebook computers, and have also begun to be applied to electric vehicles, national defense, etc. in large equipment. In order to achieve higher energy density of the above-mentioned battery, it is necessary to use a material with high energy density as the positive electrode active material. Therefore, it has been proposed to use a composite oxide in which a transition metal represented by cobalt and nickel is soli...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/485H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 张萍
Owner 詹炳辉
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