Cr2O3 supported reduced graphene oxide lithium battery anode material and preparation method

A technology of chromium trioxide and negative electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of large volume, poor conductivity, and poor battery cycle performance, and achieve high specific capacity, good conductivity, and practicality long life effect

Inactive Publication Date: 2018-08-21
UNIV OF JINAN
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, pure metal oxides face many problems in the application of lithium-ion batteries, such as volume expansion effect, larger volume during delithiation and lithium intercalation, poor conductivity, etc., which lead to poor cycle performance of batteries.

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  • Cr2O3 supported reduced graphene oxide lithium battery anode material and preparation method

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preparation example Construction

[0028] In one embodiment of the present invention, the present invention provides a kind of preparation method of chromium trioxide supported redox graphene lithium battery negative electrode material, comprises the steps:

[0029] S101: preparing graphene oxide solution and chromium chloride hexahydrate solution;

[0030] The graphene used is prepared by the Hummer method: 115ml of concentrated sulfuric acid is added to a 500ml dry beaker, 3g of graphite powder is added, poured while stirring, then 0.5g of potassium nitrate is added, and 15g of potassium permanganate is added under an ice-water bath for 4 hours Add in, magnetically stir overnight, mix well, and get a dark green viscous substance, add 200ml of water in an ice-water bath, slowly pour in, heat for 1 hour, slowly add 15ml of hydrogen peroxide (30%) and gradually oxidize to brownish yellow, stir at room temperature After 30 minutes, centrifuge and wash (2 times with dilute sulfuric acid, 3 times with water), and p...

Embodiment 1

[0046] Prepare 3g / L graphene oxide solution, dissolve 0.005mol chromium chloride hexahydrate in 10ml water, add 4ml graphene oxide solution, ultrasonic for 40min, put in 40℃ oven for 8h, then put the molten sample into porcelain Put the boat into a tube furnace, raise it from 25°C to 400°C in an argon atmosphere, keep it at 3°C ​​per minute, keep it warm for 1h, and cool it down to room temperature naturally to obtain the negative electrode material of redox graphene lithium battery supported by chromium trioxide .

Embodiment 2

[0048] Prepare 5g / L graphene oxide solution, dissolve 0.01mol chromium chloride hexahydrate in 20ml water, add 6ml graphene oxide solution, ultrasonicate for 50min, put in 60°C oven for 10h, then put the molten sample into porcelain Put the boat into a tube furnace, raise it from 25°C to 500°C in an argon atmosphere, keep it at 3°C ​​per minute, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain the negative electrode material of redox graphene lithium battery supported by chromium trioxide .

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Abstract

The invention discloses a preparation method of a Cr2O3 supported reduced graphene oxide lithium ion battery anode material. The preparation method comprises steps as follows: S101: preparing a graphene oxide solution and a chromium chloride hexahydrate solution; S102: adding the graphene oxide solution to the chromium chloride hexahydrate solution, and performing uniform ultrasonic mixing and drying to obtain a molten sample; S103: putting the sample in a porcelain boat, putting the porcelain boat in a tubular furnace, performing calcination and annealing under the inert gas, and naturally cooling a product to the room temperature to obtain a final product. The material takes chromium chloride hexahydrate as a precursor, the graphene oxide solution and the dissolved chromium chloride hexahydrate solution are mixed uniformly through ultrasonic treatment, the cathode material is prepared through calcination at the high temperature, the conductivity of the material is effectively increased through supporting of graphene, the volume expansion effect in the charge-discharge process is effectively relieved, and the lithium ion battery anode material with high specific capacity and longcyclic life is prepared. Raw materials are widely sourced, and the method is simple, controllable and easy to operate, uses simple equipment and causes little pollution.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a negative electrode material of a redox graphene lithium battery loaded with dichromium trioxide and a preparation method thereof. Background technique [0002] With the rapid development of society, the challenges of environmental pollution and energy crisis are becoming increasingly severe, and green energy has become a research and development hotspot in countries all over the world. As a new type of clean rechargeable power source, lithium-ion batteries have the advantages of light weight, low pollution, high working voltage, high energy density, and long cycle life. They have shown broad application prospects in the fields of national defense, electric vehicles, and electronics. Known as the ideal power supply in the 21st century. In lithium-ion batteries, the negative electrode material is one of the important factors affecting the battery capacity and ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCH01M4/48Y02E60/10
Inventor 袁俊黄太仲
Owner UNIV OF JINAN
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