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Antimony sulfide based composite material of sodium-ion battery and preparation method of antimony sulfide based composite material

A technology for sodium ion batteries and composite materials, which is applied in the field of antimony sulfide-based composite materials for sodium ion batteries and its preparation. It can solve the complex preparation process, high price of precursor materials, and limitations on the large-scale application of antimony sulfide/graphene composite materials, etc. problems, to achieve the effect of simple preparation method, superior cycle performance and superior rate performance

Active Publication Date: 2016-06-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of the precursor materials required for nano-antimony and its compounds and graphene composites reported in the literature is high, and the preparation process of many reported materials is complicated. These shortcomings limit the large-scale application of antimony sulfide / graphene composites.

Method used

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Embodiment 1

[0037] 0.1 mmol commercial Sb 2 S 3 Stir to dissolve in 1000ml with a concentration of 0.1molL-1 In the sodium sulfide solution (the molar ratio of antimony sulfide to sodium sulfide is 0.001:1), add 0.1mgml to the above solution -1 Graphene oxide solution, the mass ratio of graphene oxide and antimony sulfide in the graphene oxide solution is 0.001:1, and ultrasonic treatment for 1 minute. Add the sonicated solution to 50 mmol of sodium sulfite and a concentration of 5 mol L -1 mixed solution of sulfuric acid (the molar ratio of sodium sulfite to sodium sulfide is 0.5:1, and the molar ratio of sulfuric acid to sodium sulfide is 0.5:1), stirred for 5 minutes, centrifuged, and freeze-dried the precipitate to obtain a precursor. The precursor was placed in a nitrogen atmosphere at 250 o C was sintered for 24 hours to obtain Sb 2 S 3 / graphene material. Sb 2 S 3 For the physical and chemical properties of graphene materials, see figure 1 with figure 2 . XRD shows tha...

Embodiment 2

[0039] 30 mmol of commercialized Sb 2 S 3 Stir to dissolve in 2ml with a concentration of 5molL -1 Potassium sulfide solution (the molar ratio of antimony sulfide to potassium sulfide is 3:1), add 30mgml to the above solution -1 Graphene oxide solution, the mass ratio of graphene oxide and antimony sulfide in the graphene oxide solution is 0.5:1, and ultrasonic treatment for 600 minutes. Add the sonicated solution to 50 mmol of ammonium sulfite and potassium sulfite mixture (the molar ratio of ammonium sulfite to potassium sulfite is 1:1) and 0.01 molL -1 In the mixed solution of nitric acid and acetic acid (the molar ratio of nitric acid and acetic acid is 1:3) (the molar ratio of sulfite to potassium sulfide is 5:1, and the molar ratio of acid to potassium sulfide is 3:1), stirring for 10 hours, Precursor obtained by vacuum filtration and blast drying of filter residue. The precursor was placed in an argon atmosphere at 550 o C was sintered for 1 hour to obtain Sb 2 S ...

Embodiment 3

[0041] 30 mmol of commercialized Sb 2 S 3 Stir to dissolve in 8ml with a concentration of 2.5molL -1 In the mixed solution of ammonium sulfide and sodium sulfide (the molar ratio of ammonium sulfide and sodium sulfide is 1:3) (the molar ratio of antimony sulfide and sulfide salt is 1.5:1), add 15mgml to the above solution -1 The graphene oxide solution, the mass ratio of graphene oxide and antimony sulfide in the graphene oxide solution is 0.25:1, and ultrasonic treatment for 300 minutes. Pour the mixture of 55mmol ammonium bisulfite and 35mmol nitric acid (the molar ratio of sulfite to sulfide is 2.75:1, and the molar ratio of acid to sulfide is 1.75:1) into the above solution and stir for 8 hours , centrifuge and vacuum dry the precipitate to obtain the precursor. The precursor at 3%vol.H 2 / N 2 Atmosphere 300 o C was sintered for 5 hours to obtain Sb 2 S 3 / graphene material. The resulting product was assembled into a button battery to measure its charge and discha...

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Abstract

The invention discloses an antimony sulfide based composite material of a sodium-ion battery and a preparation method of the antimony sulfide based composite material. The preparation method comprises the following steps of dissolving antimony sulfide in a medium, adding a graphene oxide solution, enabling the graphene oxide solution to be fully and uniformly dispersed with ultrasound for 1-600 minutes, mixing the graphene oxide solution, sulfite and an acid solution, stirring the mixed solution for 5-600 minutes, carrying out solid-liquid separation and drying to obtain a precursor of an amorphous antimony sulfide and graphene oxide composite material, and roasting the precursor for 1-24 hours at 250-550 DEG C under an inertia or reduction atmosphere to obtain the antimony sulfide based composite material of the sodium-ion battery. The composite material prepared according to the method can be used for a negative electrode material of the sodium ion battery, the specific capacity reaches 680mAh g<-1> when the current density is 2Ag<-1>, and the specific capacity retention rate is over 96% after circulation of 100 times. Compared with a traditional hydrothermal method, the preparation method has the advantages of short flow, simplicity in process, relatively low energy consumption, low production cost and the like, and is easy for mass production.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, in particular to an antimony sulfide-based composite material for a sodium ion battery and a preparation method thereof. Background technique [0002] As a high-energy-density battery system, lithium-ion batteries have developed rapidly in the fields of portable electronic products, power tools and electric vehicles. However, lithium resources are not abundant and expensive in the earth's crust, which may limit the development of lithium-ion batteries in large-scale energy storage. Therefore, the development of an advanced battery system with abundant resources and low cost is an inevitable way out for large-scale power storage applications in the future. Sodium is in the same main group as lithium, has similar electronic structure and chemical properties, and sodium is abundant in the earth's crust, and the cost of refining is low, making sodium-ion batteries one of the most promisin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCC12P19/04H01M4/366H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 熊训辉王冠华杨成浩王英刘美林
Owner SOUTH CHINA UNIV OF TECH
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