Alternative multilayer graphene-rodlike ferric oxide composite material and hydrothermal synthesis method thereof

A technology of multi-layer graphene and composite materials, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of detachment, inability to play graphene and iron oxide composite materials, loss of activity, etc., and achieve raw material economy and good cycle performance , good volume deformation effect

Inactive Publication Date: 2018-02-16
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this structure, iron oxide is easily detached from the surface of graphene and loses its activity after charge and discharge pulverization, and cannot take advantage of the advantages of graphene and iron oxide composite materials.

Method used

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  • Alternative multilayer graphene-rodlike ferric oxide composite material and hydrothermal synthesis method thereof
  • Alternative multilayer graphene-rodlike ferric oxide composite material and hydrothermal synthesis method thereof
  • Alternative multilayer graphene-rodlike ferric oxide composite material and hydrothermal synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Using ferrous sulfate as the iron source to prepare alternating multilayer graphene-rod iron oxide composite materials.

[0034] Take 50mg graphene dry powder and ultrasonically disperse it in 70ml water solution, and then add 0.56g FeSO4·4H to the solution 2 O and 0.27g CH 3 COONa·3H 2 O, stir quickly for 30 minutes, the solution is black; transferred to a 100ml reactor, hydrothermally heated at 100°C for 8h, then hydrothermally heated at 180°C for 24h, centrifuged and washed after reaction, washed with alcohol three times, washed three times with water, and dried at 80°C Dry to obtain the reaction product. The prepared product was uniformly mixed with carbon black and PTFE according to the ratio of 70:20:10, and then formed into a film on a pair of rollers, and then pressed on a copper mesh as the working electrode, and the lithium sheet was used as the counter electrode to form a button cell. Charge and discharge test.

[0035] The XRD of the prepared product ...

Embodiment 2

[0037] Example 2: Using ferrous nitrate as iron source to prepare alternating multilayer graphene-rod iron oxide composite material.

[0038] Take 100mg graphene dry powder and ultrasonically disperse it in 120ml aqueous solution, and then add 0.6g Fe(NO 3 ) 2 And 0.41g CH 3 COONa·3H 2 O, stir quickly for 30 minutes, the solution is black; transfer to a 150ml reactor, hydrothermally heat at 100°C for 10h, then at 200°C for 24h, centrifuge and wash after reaction, wash with alcohol three times, wash three times with water, and dry at 80°C Dry to obtain the reaction product. After testing, the specific discharge capacity of the composite material reached 1063.2mAh / g in the second cycle.

Embodiment 3

[0039] Example 3: Using ferrous oxalate as iron source to prepare alternating multilayer graphene-rod iron oxide composite material.

[0040] Take 80mg graphene dry powder and ultrasonically disperse it in 100ml aqueous solution, and then add 0.43g FeC to the solution 2 O 4 And 0.8g CH 3 COONa, quickly stirred for 30 minutes, the resulting solution was black; transferred to a 120ml reactor, hydrothermally heated at 90°C for 10 hours, then hydrothermally heated at 180°C for 24 hours, after the reaction, centrifuged washing, alcohol washing three times, water washing three times, and 80°C drying Dry to obtain the reaction product. After testing, the specific discharge capacity of the composite material reached 1011.6mAh / g in the second cycle.

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Abstract

The invention relates to an alternative multilayer graphene-rodlike ferric oxide composite material and a hydrothermal synthesis method thereof. The preparation method comprises that sodium acetate micromolecules are taken as a structure directing agent, ferric oxide is controlled to be grown into a nanorod structure on the surface of graphene and be self-stacked under hydrothermal condition, so that the alternative multilayer graphene-rodlike ferric oxide composite material is formed. The prepared material is structurally characterized in that rodlike ferric oxide and graphene are in an alternative multilayer state, and the rodlike ferric oxide is uniformly loaded on the two surfaces of a graphene sheet layer; restriction and electrical conductivity of a graphene nanosheet can greatly alleviate the problem of structure efflorescence of the material in charging and discharging processes, and good electrochemical properties are shown; and the alternative multilayer graphene-rodlike ferric oxide composite material has the advantages of simple preparation technology, unique structural design, high specific capacity and good cycle performance.

Description

Technical field [0001] The invention relates to an alternating multilayer graphene-rod iron oxide composite material and a hydrothermal synthesis method thereof, belonging to the technical field of lithium batteries. Background technique [0002] In recent years, with the increasing demand for portability and high-performance energy storage devices, the energy sector, especially lithium-ion batteries and supercapacitors, has attracted widespread attention. At present, the anode material of lithium ion battery widely used in industry is graphite carbon material, but its theoretical capacity is low. It is a hot spot in the electrochemical field to find a new type of carbon anode material with superior performance. [0003] Iron oxide has become a research hotspot of lithium ion battery anode materials due to its high theoretical specific capacity, abundant reserves, low price, and environmental friendliness. However, iron oxide as a negative electrode material for lithium batteries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/366Y02E60/10
Inventor 蔡新辉王双才郭挺吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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