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
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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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