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Zinc tungstate/graphene composite material and preparation method and application thereof

A composite material and graphene technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as low specific capacity and poor safety, and achieve simple methods, excellent electrochemical performance, good rate performance and electrical conductivity. Effect

Inactive Publication Date: 2017-06-13
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a zinc tungstate / graphene composite material, which has good cycle performance, rate performance and conductivity as a lithium ion negative electrode, and overcomes the problems of low specific capacity and poor safety of traditional graphite carbon materials

Method used

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  • Zinc tungstate/graphene composite material and preparation method and application thereof
  • Zinc tungstate/graphene composite material and preparation method and application thereof
  • Zinc tungstate/graphene composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0034] 1. Add 40 mg GO to 20 mL deionized water and stir for 10 min, then transfer to an ultrasonic box for ultrasonic treatment for 2 h.

[0035] 2. Add 1mmol (298mg) Zn(NO 3 ) 2 6H 2 O aqueous solution 10mL, continue to stir for 4h.

[0036] 3. Slowly add 2mmol (660mg) Na 2 WO 4 2H 2 O 10mL aqueous solution, 10mL urotropine 50mg aqueous solution. Stir for 2h, transfer to the reaction kettle, and react at 200°C for 10h.

[0037] 4. Wash 3 times with alcohol, wash 3 times with water, and dry at 80°C for 5 hours to obtain ZnWO 4 @RGO.

[0038] 5. Performance testing:

[0039] 5.1 Morphological characteristics: such as figure 1 As shown, zinc tungstate nanoparticles are evenly distributed on the surface of graphene, and the particle size is about 50nm.

[0040] 5.2 Composition analysis: such as figure 2 As shown, ZnWO 4 The XRD of @RGO corresponds to the peaks of standard zinc tungstate, indicating that the complex is a complex of zinc tungstate and graphene with...

Embodiment 2

[0044] 1. Add 40mg GO to 20mL deionized water and stir for 10min, then transfer to an ultrasonic box for ultrasonic treatment for 2h.

[0045] 2. Add 1mmol (298mg) Zn(NO 3 ) 2 6H 2O aqueous solution 10mL, continue to stir for 4h.

[0046] 3. Slowly add 2mmol (660mg) Na 2 WO 4 2H 2 O 10mL aqueous solution, 170mg urotropine aqueous solution 10mL. Stir for 2h, transfer to the reaction kettle, and react at 200°C for 10h.

[0047] 4. Wash 3 times with alcohol, wash 3 times with water, and dry at 80°C for 5 hours to obtain ZnWO 4 @RGO.

[0048] 5. Performance testing:

[0049] 5.1 Morphological characteristics: such as Figure 4 As shown, the zinc tungstate is distributed on the graphene surface in the form of rods, the rods are 0.4 μm to 0.6 μm in length and about 80 nm in diameter.

[0050] 5.2 Composition analysis: such as Figure 5 As shown, ZnWO 4 The XRD of @RGO corresponds to the peaks of standard zinc tungstate, indicating that the complex is a complex of zinc...

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Abstract

The invention discloses a zinc tungstate / graphene composite material and a preparation method and an application thereof, and belongs to the technical field of composite material preparation. The preparation method comprises the following steps of (1) adding graphene oxide into water to obtain a graphene oxide dispersion liquid; and (2) adding soluble zinc salt, soluble tungstate and methenamine into the graphene oxide dispersion liquid in sequence to obtain a mixed system, stirring uniformly and then performing a hydrothermal reaction to obtain the zinc tungstate / graphene composite material. The preparation of the zinc tungstate / graphene composite material is completed by the one-step hydrothermal method, so that the method is simple; the prepared composite material has high rate capability and conductivity; and the appearance of the composite material can be adjusted by adjusting the dosage of methenamine, and the electrochemical performance of the obtained rod-like composite material is better than that of a granular composite material.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a zinc tungstate / graphene composite material and its preparation method and application. Background technique [0002] At present, lithium-ion batteries have been widely used in various portable electronic products and communication tools. Due to its superior performance, lithium-ion batteries have also become potential power batteries and have been gradually developed as power sources for electric vehicles. The power supply has very high requirements on the performance of electrode materials. In addition to high specific energy and high specific power, safety, production cost and cycle performance also need to meet the requirements. The anode materials of commercialized lithium-ion batteries are mainly graphitized carbon materials. Graphitized carbon materials have good crystalline conductivity, but as anodes for power-type lithium-ion batteries, they hav...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525
CPCH01M4/364H01M4/5825H01M4/587H01M10/0525Y02E60/10
Inventor 唐志文李文施利勇孙伟余心亮朱生文
Owner TIANNENG SAFT ENERGY JOINT CO
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