A kind of sodium ion battery negative electrode sns/c composite material and preparation method thereof

A sodium-ion battery and composite material technology, which is applied in the field of sodium-ion battery tin sulfide and carbon composite materials and its preparation, can solve the problems of less sodium-ion batteries, immature positive and negative electrode materials and processes, and performance problems of sodium-ion batteries. Incomparable and other problems, to achieve the effect of high production efficiency, simple preparation process and high output

Active Publication Date: 2018-12-11
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on sodium-ion batteries at this stage is still relatively small, and the optional positive and negative electrode materials and processes are still immature, which leads to the fact that the performance of current sodium-ion batteries is still not comparable to that of lithium batteries.

Method used

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  • A kind of sodium ion battery negative electrode sns/c composite material and preparation method thereof
  • A kind of sodium ion battery negative electrode sns/c composite material and preparation method thereof
  • A kind of sodium ion battery negative electrode sns/c composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 1 mmol commercialized SnS 2 Stir to dissolve in 1000 ml with a concentration of 0.1 mol L -1 A stable transparent solution is formed in the ammonium sulfide solution (the molar ratio of tin sulfide to ammonium sulfide is 0.01:1);

[0034] (2) Add 182.84 mg of PVP to the above solution to make the mass ratio of organic carbon source to tin sulfide 1:1, and stir for 600 min;

[0035] (3) blowing and drying the solution after the reaction and stirring treatment to obtain a composite material precursor;

[0036] (4) The composite material precursor was sintered at 550 °C for 1 h under nitrogen atmosphere, cooled, washed and dried to obtain the SnS / C composite material.

[0037] The physical and chemical properties of the prepared SnS / C composites are shown in figure 1 and figure 2 , figure 1 is the XRD spectrum of the prepared SnS / C composite, figure 2 is the SEM image of the SnS / C composite material prepared in Example 1.

[0038] XRD shows that the SnS / C mate...

Embodiment 2

[0041] (1) 0.1 mol commercial SnS 2 Stir to dissolve in 5 ml at a concentration of 5 mol L -1 A stable transparent solution is formed in the sodium sulfide solution (the molar ratio of tin sulfide to ammonium sulfide is 4:1);

[0042] (2) Add 0.182 g of glucose to the above solution so that the mass ratio of organic carbon source to tin sulfide is 0.01:1, and stir for 5 min;

[0043] (3) Freeze-drying to obtain the precursor of the composite material;

[0044] (4) The composite material precursor was sintered at 400 °C for 24 h in an argon atmosphere, cooled, washed, and dried to obtain the SnS / C composite material.

[0045] The physical and chemical properties of the prepared SnS / C material are shown in Figure 4 , Figure 5 , Figure 4 is the SEM image of the prepared SnS / C composite, Figure 4 It shows that the composite of tin sulfide and carbon is relatively uniform. The resulting SnS / C composites were assembled into coin cells, Figure 5 at a current density of 3...

Embodiment 3

[0047](1) 10 mmol of commercial SnS 2 Stir to dissolve in 2 mL with a concentration of 2.5 mol L -1 In the mixed solution of potassium sulfide and ammonium sulfide (the molar ratio of tin sulfide to ammonium sulfide is 2:1, and the molar ratio of potassium sulfide to ammonium sulfide is 1:1);

[0048] (2) Add 914.2 mg of citric acid to the above solution so that the mass ratio of organic carbon source to tin sulfide is 0.5:1, and stir for 300 minutes;

[0049] (3) Vacuum drying at 90°C to obtain the composite material precursor;

[0050] (4) Mix the composite material precursor at 3% vol. H 2 / N 2 Sintering at 475°C for 12 h in a mixed atmosphere, cooling, washing, and drying to obtain SnS / C composites.

[0051] The obtained SnS / C composite material was assembled into a button battery to measure its charge and discharge capacity, and the cycle life test was carried out in the range of 0.01-2.5V. Such as Figure 6 Shown is the rate performance of the prepared button batte...

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Abstract

The invention discloses a sodium-ion battery negative electrode SnS / C composite material and a preparation method thereof. The preparation method comprises the following steps: dissolving tin sulfide into a medium solution to obtain a solution I; adding an organic carbon source into the solution I and continuously stirring until the organic carbon source is uniformly dispersed, thereby obtaining a solution II; drying the solution II to obtain a solid powder precursor of the SnS / C composite material; roasting the solid powder precursor to obtain the porous SnS / C composite material. The tin sulfide in the composite material prepared by the preparation method has a nano structure with a controllable particle size, and a carbon layer coating the surface of the composite material is loose and porous, and is very beneficial for ion and electron transmission. According to the results, the composite material is used as a sodium-ion battery negative electrode material, has initial specific capacity of 620 mAh g<->1 under current density being 3A g<-1>, and has a specific capacity retention rate higher than 90% after 200 cycles. Compared with a conventional process for preparing stannous sulfide through thermal decomposition of tin sulfide, the preparation method has the advantages of being short in flow, simple in process, relatively low in energy consumption, high in controllable degree, easy for realizing large-scale production, and the like.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, in particular to a composite material of stannous sulfide and carbon for sodium ion batteries and a preparation method thereof. Background technique [0002] With the rapid development of renewable energy such as solar energy and wind energy, it is becoming more and more important to successfully store these discontinuous electric energy in a large-scale electric energy storage grid system. Among these potential energy storage technologies, electrochemical battery technology is the most effective method for large-scale electric energy storage due to its flexibility, high energy conversion efficiency and easy maintenance. So far, Li-ion battery is the most successfully developed electric energy storage technology, which has been widely used in mobile devices and devices such as portable electronics and electric vehicles. However, the lack of lithium resources limits the further applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054
CPCH01M4/364H01M4/5815H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 熊训辉杨成浩王冠华林志华欧星王英刘美林林璋
Owner SOUTH CHINA UNIV OF TECH
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