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Preparation and application of selenium/graphene nanometer composite material

A nanocomposite material, graphene technology, applied in the field of selenium/graphene nanocomposite materials, can solve problems such as poor cycle performance, and achieve the effects of cheap raw materials, excellent sodium storage performance, and uniform morphology

Inactive Publication Date: 2018-04-13
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor cycle performance when elemental selenium is used as a sodium ion negative electrode material, and propose a new selenium / graphene nanocomposite material with high capacity and good cycle stability, and exhibits extremely excellent low temperature Rate and Cycle Performance

Method used

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  • Preparation and application of selenium/graphene nanometer composite material
  • Preparation and application of selenium/graphene nanometer composite material
  • Preparation and application of selenium/graphene nanometer composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The preparation of embodiment 1 selenium / graphene nanocomposite material

[0022] Disperse selenium powder in 4mg L according to the mass ratio of 3:1 -1 In the graphene oxide solution, disperse evenly, and freeze-dry for 46 hours to obtain a mixed material of selenium and graphene oxide; heat up to 350°C at 2°C / min, and calcinate for 5h; obtain a selenium / graphene nanocomposite material.

Embodiment 2

[0023] The preparation of embodiment 2 selenium / graphene nanocomposite material

[0024] Disperse selenium powder in 1mg L according to mass ratio 1:1 -1 The graphene oxide solution was uniformly dispersed and freeze-dried for 46 hours to obtain a mixed material of selenium and graphene oxide; the temperature was raised to 600°C at 2°C / min, and calcined for 5h; a selenium / graphene nanocomposite material was obtained.

Embodiment 3

[0025] The preparation of embodiment 3 selenium / graphene nanocomposite material

[0026] Disperse selenium powder in 4mg L- 1 The graphene oxide solution was uniformly dispersed and freeze-dried for 24 hours to obtain a mixed material of selenium and graphene oxide; the temperature was raised to 500°C at 5°C / min, and calcined for 4h; the selenium / graphene nanocomposite material was obtained.

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Abstract

The invention discloses a selenium / graphene nanometer composite material and application thereof in a sodium ion battery negative electrode. The invention provides the selenium / graphene nanometer composite material, a selenium and graphene oxide mixture material is obtained by uniformly dispersing selenium powder in a graphene oxide solution and performing freezing and drying, and the selenium / graphene nanometer composite material is obtained by a method of melting and dispersing. The preparation method is simple, the raw material is low in cost and uniform in morphology, the selenium / graphenenanometer composite material can be prepared on a large scale, excellent sodium storage performance, particularly low-temperature cycle property is shown when the selenium / graphene nanometer composite material is used as the sodium ion battery negative electrode material, and the selenium / graphene nanometer composite material is the sodium ion battery negative material expected to be applied.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and sodium ion secondary batteries, and specifically relates to a selenium / graphene nanocomposite material and its application. Background technique [0002] In recent years, with the increasing consumption of non-renewable energy and the gradual aggravation of environmental pollution. Lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage devices due to their advantages such as high energy density, safety and stability, green efficiency, and no memory effect. However, the global reserves of lithium resources are very limited, which greatly limits the large-scale application of lithium batteries in the future. In contrast, sodium is extremely abundant in the earth's crust, and sodium-ion batteries have a similar energy storage mechanism to lithium-ion batteries, so they have received extensive attention. However, the radius...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/366H01M4/38H01M4/628H01M10/054Y02E60/10
Inventor 吴兴隆王莺莺侯宝华吕红艳
Owner NORTHEAST NORMAL UNIVERSITY