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Method for preparing metal oxide/graphene-doped composite nano material based on microwave method and application

A graphene composite and nano-material technology, applied in the direction of graphene, iron oxide/iron hydroxide, iron oxide, etc., can solve the problems of long and cumbersome test periods, achieve high specific capacity, good repeatability, and improve electrical conductivity and cycle performance effects

Inactive Publication Date: 2017-09-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently reported metal oxide and graphene composite materials are commonly hydrothermal method, but this preparation method has a long test period and is relatively cumbersome, and most of them use toxic reducing agents such as sodium borate and hydrazine hydrate to reduce graphene oxide.

Method used

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  • Method for preparing metal oxide/graphene-doped composite nano material based on microwave method and application
  • Method for preparing metal oxide/graphene-doped composite nano material based on microwave method and application
  • Method for preparing metal oxide/graphene-doped composite nano material based on microwave method and application

Examples

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Embodiment 1

[0029] A method for synthesizing iron oxide and graphene composite material with a chromium-doped amount of 2% (atomic percent) by microwave method, comprising the following steps:

[0030] (1) Graphene oxide was prepared by the improved Hummer method, and after centrifugal washing, it was ultrasonically dispersed for 2 hours to prepare 1mgmL -1 graphene oxide aqueous solution.

[0031] (2) Configure an aqueous solution of ferrous chloride with an ion concentration of 0.02mol / L, take 100ml of the solution, add 1.2g of urea, disperse it ultrasonically for 10min, dissolve all the raw materials, add 10mL of the above graphene oxide solution, and stir magnetically for 30min , to obtain a homogeneous mixed solution.

[0032] (3) Weigh 16mg chromium nitrate nonahydrate (Cr(NO 3 ) 3 9H 2 O) Add the above solution and continue to stir to obtain a uniform tan mixed solution.

[0033] (4) Pour the mixed solution into a three-necked round-bottomed flask, and put it into a microwave ...

Embodiment 2

[0036] A kind of method for the iron oxide and graphene composite material of microwave method synthesis chromium doping amount 4% (atomic percentage), comprises the following steps:

[0037] (1) Graphene oxide was prepared by the improved Hummer method, and after centrifugal washing, it was ultrasonically dispersed for 2 hours to prepare 1mgmL -1 graphene oxide aqueous solution.

[0038](2) Configure an aqueous solution of ferrous chloride with an ion concentration of 0.02mol / L, take 100ml of the solution, add 1.2g of urea, disperse it ultrasonically for 10min, dissolve all the raw materials, add 10mL of the above graphene oxide solution, and stir magnetically for 30min , to obtain a homogeneous mixed solution.

[0039] (3) Weigh 32mg chromium nitrate nonahydrate (Cr(NO 3 ) 3 9H 2 O) Add the above solution and continue to stir to obtain a uniform tan mixed solution.

[0040] (4) Pour the mixed solution into a three-necked round-bottomed flask, and put it into a microwave...

Embodiment 3

[0043] A method for synthesizing tin oxide and graphene composite materials with an antimony-doped amount of 2% (atomic percent) by microwave method, comprising the following steps:

[0044] (1) Graphene oxide was prepared by the improved Hummer method, and after centrifugal washing, it was ultrasonically dispersed for 2 hours to prepare 1mgmL -1 graphene oxide aqueous solution.

[0045] (2) Configure an aqueous solution of stannous chloride with an ion concentration of 0.02mol / L, take 100ml of the solution, add 0.3g of urea, disperse it ultrasonically for 10min, dissolve all the raw materials, add 10mL of the above graphene oxide solution, and stir magnetically for 30min , to obtain a homogeneous white mixed solution.

[0046] (3) Weigh 9 mg of antimony trichloride and add to the above solution, and continue stirring for 1 h to obtain a mixed solution.

[0047] (4) Pour the mixed solution into a three-necked round-bottomed flask, and put it into a microwave catalytic synthe...

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Abstract

The invention discloses a method for preparing a metal oxide / graphene-doped composite nano material based on a microwave method. According to the method, a low-valence metal ion (Fe<2+>, Sn<2+> and the like) with reducing property is used as a reducing agent, and chrome, antimony, nickel and the like are used as doping elements; under the assistance of microwave heating, graphene oxide is reduced, and the metal oxide-doped composite material uniformly distributed on a graphene sheet layer is synthesized. The method realizes simultaneous operation of doping, low-valence metal ion oxidization and graphene oxide reduction; use of hypertoxic hydrazine hydrate for reducing the graphene oxide is avoided, and the method is environment-friendly and pollution-free; the process equipment is simple, high in heating speed, short in reaction time and high in product purity; the production efficiency is greatly improved. The metal oxide and graphene-doped composite material prepared through the method is relatively high in relative specific capacity and high in circulation stability when used as an anode material of a lithium ion battery and a sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a method for rapidly preparing lithium-ion batteries and sodium-ion battery negative electrode materials doped with metal oxides and graphene by using microwaves. Background technique [0002] With the global environment and energy problems becoming more and more serious, electric vehicles have begun to enter people's field of vision, and the power source of vehicles has begun to change from gasoline to electric energy. People are in urgent need of a high-power, high-capacity energy storage element . Lithium-ion batteries are considered to be ideal energy storage batteries due to their advantages such as less environmental pollution, no memory effect, fast charge and discharge, high specific energy, long charge and discharge life, and low self-discharge rate. The sodium-ion battery is expected to become the protagonist of the new generation of energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/62H01M10/0525H01M10/054B82Y30/00C01B32/184C01G49/06C01G19/02
CPCB82Y30/00C01G19/02C01G49/06C01P2002/72C01P2004/03C01P2006/40H01M4/362H01M4/48H01M4/52H01M4/625H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 李秋红潘茜林小萍居小康王太宏
Owner XIAMEN UNIV
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