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Tin sulfide/graphene sodium ion battery composite cathode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the cycle life of materials cannot meet the requirements of practical applications, it is difficult to achieve controllable preparation of materials, and the poor conductivity of sulfides. Excellent rate performance and cycle performance, high capacity, and the effect of improving electronic conductivity

Active Publication Date: 2017-05-10
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the poor conductivity of sulfide and the inevitable volume change in the process of deintercalating sodium make it difficult to meet the requirements of practical application in the cycle life of this material.
Composite preparation of composite materials with graphene is an effective method to effectively improve the electrochemical performance of tin sulfide materials, while the traditional method generally uses hydrothermal and solid phase ball milling, the material preparation process is complicated, and it is difficult to achieve controllable preparation of materials

Method used

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  • Tin sulfide/graphene sodium ion battery composite cathode material and preparation method thereof
  • Tin sulfide/graphene sodium ion battery composite cathode material and preparation method thereof
  • Tin sulfide/graphene sodium ion battery composite cathode material and preparation method thereof

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Embodiment 1

[0032] Stir and dissolve 0.01 g of commercial tin sulfide in 372.7 g of 1 wt. % ammonium sulfide solution (the molar ratio of tin sulfide to ammonium sulfide is 0.001:1), and add 0.1 mg ml -1 The graphene oxide solution was prepared so that the mass ratio of graphene oxide to tin sulfide was 0.001:1, and it was ultrasonically treated for 1 min to make it fully dispersed, then quickly frozen with liquid nitrogen, and then freeze-dried for 6 h to obtain the precursor. The precursor was placed in a nitrogen atmosphere at 250 o C sintered for 24 h to obtain tin sulfide / graphene composites. The physical and chemical properties of tin sulfide / graphene composites can be seen in figure 1 with figure 2 . After comparing with the standard reference card, it can be seen that XRD shows that the tin sulfide / graphene composite material synthesized by this method is consistent with the standard card. SEM shows that the composite material is loose and porous, and the tin sulfide particle...

Embodiment 2

[0034] Stir and dissolve 40 mmol of commercial tin sulfide in 3.4 g of 20 wt. % ammonium sulfide solution (the molar ratio of tin sulfide to ammonium sulfide is 4:1), and add 30 mg ml of -1 Graphene oxide solution, so that the mass ratio of graphene oxide to tin sulfide is 0.5:1, and ultrasonically treated for 600 min to make it fully dispersed and uniform. The sonicated solution was rapidly refrigerated with dry ice and then vacuum freeze-dried for 36 h to obtain the precursor. The precursor was then placed in an argon atmosphere at 500 o C was sintered for 1 h to obtain tin sulfide / graphene composites. The physical and chemical properties of tin sulfide / graphene composites can be seen in Figure 4 with Figure 5 . Figure 4 The SEM and TEM results show that the composite of tin sulfide and graphene is relatively uniform. Figure 5 for a current density of 1 A g -1 The cycle charge-discharge curve below shows that the composite material has a current density specific ca...

Embodiment 3

[0036] Dissolve 4 mmol of commercial tin sulfide in 13.68 g of ammonium sulfide solution with a concentration of 11.5 wt. % (the molar ratio of tin sulfide to ammonium sulfide is 2:1), and add 15 mg ml of -1 Graphene oxide solution, so that the mass ratio of graphene oxide and tin sulfide in the graphene oxide solution is 0.25:1, and ultrasonic treatment for 300 min to make it fully dispersed and uniform, and then use microwave vacuum freeze-drying after freezing by laser rapid refrigeration technology72 h to get the precursor. The precursor at 3% vol.H 2 / N 2 Atmosphere 375 oC was sintered for 5 h to obtain tin sulfide / graphene material. Assemble the resulting product into a button battery to measure its charge and discharge capacity, and perform 3 A g in the range of 0.01-2.5V -1 The cycle life test under the condition is obtained as Image 6 The shown tin sulfide / graphene material at a current density of 3 A g -1 The cycle charge and discharge curve below shows that t...

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Abstract

The invention discloses a tin sulfide / graphene sodium ion battery composite cathode material and a preparation method thereof. The preparation method includes: dissolving tin sulfide in ammonium sulfide solution, adding graphene oxide solution, performing ultrasonic treatment to enable the graphene oxide solution to be dispersed uniformly, constructing a three-dimensional porous structure through quenching, and freeze-drying for 6-72h to obtain a tin sulfide and graphene composite material precursor; calcining the precursor in inert or reductive atmosphere at 250-500 DEG C for 1-24h to obtain the tin sulfide / graphene sodium ion battery composite cathode material. The composite material can be used as a sodium ion battery cathode material, specific capacity of the composite material can reach 649.5mAh g-1 when current density is 1Ag-1, and specific capacity retention rate after being circulated for 300 times is higher than 90%. Compared with conventional hydrothermal methods, the tin sulfide / graphene sodium ion battery composite cathode material and the preparation method have the advantages of short process, simple course, low energy consumption, high material preparation controllability, easiness in realizing large-scale production and more excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, in particular to a tin sulfide / graphene sodium ion battery composite negative electrode material and a preparation method thereof. Background technique [0002] "Energy crisis" and "environmental pollution" are two serious problems that human beings must face in the 21st century, and the development of large-scale green energy storage grids is one of the ways to solve the problems. Due to its cost advantage, sodium-ion batteries are expected to replace lithium-ion batteries and become the first choice in the field of large-scale energy storage. At present, the anode materials of sodium ion batteries are mainly various carbon materials, and the sodium storage capacity of carbon anode materials is limited, and the initial efficiency is extremely low, which greatly limits the further improvement of the energy density of current sodium ion batteries. Simply by improving the preparation pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCH01M4/366H01M4/5815H01M4/587H01M10/054Y02E60/10
Inventor 熊训辉王冠华杨成浩林志华欧星王英刘美林林璋
Owner SOUTH CHINA UNIV OF TECH
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