Preparation method and application of carbon tin nanometer composite powder
A nanocomposite powder, tin powder technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. low rate and other problems, to achieve the effects of good cycle stability, low cost, and high reversible lithium storage capacity
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Example Embodiment
[0019] Example one:
[0020] Press 80g of tin micron powder into a block target, place it in an automatic control DC arc hydrogen plasma equipment as the anode, carbon rod as the cathode, pass in a mixture of methane and argon at a ratio of 1:0.5, and evaporate The fast-body target material undergoes process steps such as condensation and passivation to obtain a carbon-coated tin nanocomposite powder material.
[0021] According to the mass ratio, the above-mentioned 80% carbon-tin nanocomposite powder, 10% carbon black and 10% PTFE binder are uniformly mixed to make an electrode sheet, which is combined with 1mol / L LiPF 6 The solution electrolyte and the metal lithium sheet are assembled into a button battery in the glove box. At current density 0.2mA / cm 2 And the voltage is tested in the range of 2~0.01V. The first reversible specific capacity of this carbon-tin nanocomposite powder was measured to be 560mAh / g.
Example Embodiment
[0022] Embodiment two:
[0023] The implementation steps are basically the same as in Example 1, except that the ratio of methane and argon in the mixed atmosphere is 1:1; the obtained carbon-coated tin nanocomposite powder is made into electrode sheets and tested, and the first reversible ratio is measured. The capacity is 310mAh / g.
Example Embodiment
[0024] Embodiment three:
[0025] The implementation steps are basically the same as in Example 1, except that the ratio of methane and argon in the mixed atmosphere is 1:2; the obtained carbon-coated tin nanocomposite powder is made into electrode sheets and tested, and the first reversible ratio is measured The capacity is 620mAh / g.
[0026] The XRD pattern of the carbon-coated tin nanocomposite powder obtained in Example 3 is as follows figure 1 Shown. The figure shows that the main phase of the composite material is metallic tin.
[0027] The TEM image of the carbon-coated tin nanocomposite powder obtained in Example 3 is as follows figure 2 Shown. The figure shows that the microstructure of the composite material is carbon nanotubes partially filled with metal tin.
[0028] The TEM image of the carbon-coated tin nanocomposite powder obtained in Example 3 is as follows image 3 Shown. The figure shows that the carbon nanotubes in the composite material are multi-walled carbon ...
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