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Preparation and application of a selenium-coated tin dioxide/graphene nanocomposite
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A nano-composite material, tin dioxide technology, applied in the direction of non-aqueous electrolyte battery electrodes, structural parts, electrical components, etc., can solve the problems of poor rate and cycle performance, and achieve simple preparation methods, uniform appearance, and excellent sodium storage performance effect
Active Publication Date: 2020-04-21
NORTHEAST NORMAL UNIVERSITY
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[0003] The purpose of the present invention is to solve SnO 2 As a sodium ion anode material, the rate and cycle performance are poor. A new selenium-coated tin dioxide / graphene nanocomposite with high specific capacity and good cycle stability is proposed.
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Embodiment 1
[0021] The preparation of the tin dioxide / graphene nanocomposite material of embodiment 1 selenium coating
[0022] Add 2.48 g of L-tartaric acid to 50 ml of deionized water, then add 295 µL of anhydrous tin tetrachloride to the solution, and add 150 mg of graphene oxide aqueous solution (3.5 mg mL -1 ), diluted to 300mL; under continuous stirring, 50mL of 0.1mg mL-1 sodium borohydride solution was added dropwise to the above suspension, then ultrasonicated for 3-6h, centrifuged, washed with deionized water and absolute ethanol, 80 Vacuum drying at ℃; obtain the intermediate product of Sn; mix the selenium powder and the intermediate product of Sn at a mass ratio of 2.5:1, heat up to 400°C, and calcinate for 4 hours; obtain the selenium-coated tin dioxide / graphene nanocomposite material .
Embodiment 2
[0023] Example 2 Preparation of tin dioxide / graphene nanocomposites coated with selenium
[0024] Add 2.48g of L-tartaric acid to 50ml of deionized water, then add 295µL of anhydrous tin tetrachloride to the solution, and add 150mg of graphene oxide aqueous solution (3.5mg mL -1 ), diluted to 300mL; under continuous stirring, 50mL of 0.3mg mL was added dropwise to the above suspension -1 Sodium borohydride solution, then ultrasonic 3-6h, centrifuged, washed with deionized water and absolute ethanol, vacuum-dried at 80°C; the intermediate product of Sn was obtained; the intermediate product of selenium powder and Sn was mixed according to the mass ratio of 2.5:1 Mix evenly, heat up to 400° C., and calcinate for 4 hours; obtain a selenium-coated tin dioxide / graphene nanocomposite material.
Embodiment 3
[0025] Example 3 Preparation of tin dioxide / graphene nanocomposite material coated with selenium
[0026] Add 2.48g of L-tartaric acid to 50ml of deionized water, then add 295µL of anhydrous tin tetrachloride to the solution, and add 150mg of graphene oxide aqueous solution (2mg mL -1 ), diluted to 300mL; under constant stirring, add 50mL of 0.2mg mL dropwise to the above suspension -1 Sodium borohydride solution, then ultrasonic 3-6h, centrifuged, washed with deionized water and absolute ethanol, vacuum-dried at 80 ° C; to obtain the intermediate product of Sn; the mass ratio of selenium powder and Sn intermediate product was 2.5:1 Mix evenly, heat up to 400° C., and calcinate for 4 hours; obtain a selenium-coated tin dioxide / graphene nanocomposite material.
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Abstract
The invention discloses a selenium-coated tin dioxide / graphene nano composite material and an application thereof in a cathode material of a sodium-ion battery. The selenium-coated tin dioxide / graphene nano composite material is characterized in that 1) two types of SnO2 of different crystal phases (SnO2 of a tetragonal system and SnO2 of an orthorhombic system) tightly grow together to form nanoscale particles; 2) the formed nanoscale particles are uniformly combined on the surface of three-dimensional graphene; and 3) unordered selenium uniformly coats the surface of the tin dioxide / graphenenano structure. The selenium-coated tin dioxide / graphene nano composite material provided by the invention is simple in preparation method, cheap in raw material and uniform in shape, can be preparedon a large scale, and shows an excellent sodium storage property as the cathode material of the sodium-ion battery, benefited by the selenium coating. The two tin dioxide heterostructures in the composite material and the three-dimensional conducting network of graphene have a synergistic effect, so that the material is quite expected to be applied to the cathode material of the sodium-ion battery.
Description
technical field [0001] The invention belongs to the technical field of nanomaterials and sodium ion secondary batteries, and in particular relates to a selenium-coated tin dioxide / graphene nanocomposite material and applications thereof. Background technique [0002] Energy and the environment have always been the focus of attention around the world. In recent years, with the increasing consumption of non-renewable energy and the gradual aggravation of environmental pollution, people's demand for clean energy is also increasing. Due to the limited reserves of lithium resources in the world, it is difficult to meet the urgent demand for future energy storage by relying on lithium-ion batteries alone. Therefore, it is urgent to develop a next-generation high-performance energy storage power supply that can replace lithium-ion batteries. Sodium is an active metal element in the same main group as lithium and has similar physical and chemical properties. Because of this, sodiu...
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