A kind of graphene composite ternary positive electrode material and its preparation method and application

A technology of graphene composite and ternary materials, which is applied in the direction of electrical components, battery electrodes, structural parts, etc., and can solve the problems that it is difficult to give full play to the performance of graphene, and it is difficult to mix graphene and ternary materials uniformly.

Active Publication Date: 2019-03-15
ZHANJIANG JUXIN NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the hydrophobicity and easy agglomeration of graphene, it is difficult to mix graphene and ternary materials uniformly, so it is difficult to give full play to the unique properties of graphene

Method used

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  • A kind of graphene composite ternary positive electrode material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Mix nickel sulfate, cobalt nitrate, and manganese nitrate in a molar ratio of 2:3:5, add 15wt% sodium hydroxide and 5wt% sodium peroxide accounting for the mass of the mixture, mix and grind evenly. Put the mixture into a muffle furnace for heat treatment at 500°C and keep it warm for 6 hours to obtain nickel cobalt manganate.

[0054] 2. Weigh graphite powder with a particle size of 5 μm and a purity of 99.9% with 2% of the total mass of nickel-cobalt oxomanganate, put it into 200 ml of 60% sulfuric acid solution, and stir to form a mixture. Slowly add the nickel cobalt manganese oxo-manganate in step 1 into the above mixture and stir, react at a low temperature of 10-30°C for 1 hour, at a medium temperature of 50-70°C for 5 hours, at a high temperature of 80-95°C for 3 hours, and obtain a mixture liquid.

[0055] 3. Disperse the mixed liquid reacted in step 2 into deionized water, and ultrasonicate for 60 minutes.

[0056] 4. Slowly add sodium hydroxide solution ...

Embodiment 2

[0059] 1. Mix nickel sulfate, cobalt nitrate, and manganese nitrate in a molar ratio of 1:1:1, add 20wt% sodium hydroxide and 5wt% hydrogen peroxide accounting for the mass of the mixture, mix and grind evenly. Put the mixture into a muffle furnace for heat treatment at 700°C and keep it warm for 3 hours to obtain nickel cobalt manganate.

[0060] 2. Weigh graphite powder with a particle size of 5 μm and a purity of 99.9% with the total mass of nickel cobalt manganese oxymanganate as 4%, and put it in 400ml of 80% concentrated sulfuric acid and concentrated nitric acid mixed solution, and stir to form a mixture. Slowly add the nickel cobalt manganese oxo-manganate in step 1 into the above mixture and stir, react at a low temperature of 10-30°C for 2 hours, at a medium temperature of 50-70°C for 4 hours, at a high temperature of 80-95°C for 5 hours, and obtain a mixture liquid.

[0061] 3. Disperse the mixed liquid reacted in step 2 into deionized water, and sonicate for 80 mi...

Embodiment 3

[0065] 1. Mix nickel sulfate, cobalt nitrate, and manganese nitrate in a molar ratio of 3:3:4, add 10wt% sodium hydroxide and 5wt% potassium peroxide accounting for the mass of the mixture, mix and grind evenly. Put the mixture into a muffle furnace for heat treatment at 600°C and keep it warm for 4 hours to obtain nickel cobalt manganate.

[0066] 2. Weigh graphite powder with a particle size of 5 μm and a purity of 99.9% and put it into 500 ml of 70% concentrated sulfuric acid and concentrated nitric acid mixed solution, and stir to form a mixture. Slowly add the nickel-cobalt manganese oxo-manganate in step 1 into the above mixture and stir, react at a low temperature of 10-30°C for 3 hours, at a medium temperature of 50-70°C for 4 hours, and at a high temperature of 80-95°C for 5 hours, to obtain Mix liquid.

[0067] 3. Disperse the mixed liquid reacted in step 2 into deionized water, and sonicate for 40 minutes.

[0068] 4. Under the condition of high-speed stirring, sl...

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Abstract

The invention discloses a preparation method of a graphene oxide ternary cathode material precursor, a preparation method of a graphene composite ternary cathode material and products obtained by the methods. Nickel cobalt manganese polyoxometalate is used as an oxidizing agent for directly oxidizing graphite to form graphene oxide; and in the oxidizing process, nickel, cobalt and manganese ions can be embedded in the graphene oxide to form a sandwich structure. The structure is beneficial for enabling the ternary material to comprise primary nano particles or a small quantity of secondary particles in the sintering process, reducing agglomeration of various nano materials, protecting the structure of the ternary material and sufficiently playing a compounding effect of the nano materials and graphene. The three-dimensional network structure not only is beneficial to transmission of electrons and ions, but also can effectively inhibit structural damage to the ternary material, which is caused by volume change in the lithium insertion and extraction process, and has high specific capacity and excellent cycle performance and rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a preparation method of a graphene composite ternary positive electrode material for lithium ion batteries. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high working voltage, good safety, and no memory effect. They are widely used in many portable electronic devices such as notebook computers, mobile phones, and instrument lamps. , power tools and energy storage power stations and other fields also have good application prospects. Therefore, with the continuous expansion of the application field of lithium-ion batteries and the continuous generation and replacement of corresponding products, higher and higher requirements will be put forward for lithium-ion batteries, and the most direct way to improve the overall performance of batteries is to improve the performance of battery materials . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/583H01M4/1391H01M4/1393H01M10/0525
CPCH01M4/1391H01M4/1393H01M4/362H01M4/505H01M4/525H01M4/583H01M10/0525Y02E60/10
Inventor 吴其修
Owner ZHANJIANG JUXIN NEW ENERGY
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