Preparation method of double-layer porous carbon nanofibers for lithium-sulfur batteries and method for preparing positive electrode materials using the same
A lithium-sulfur battery and nanofiber technology, applied in battery electrodes, nanotechnology, circuits, etc., can solve problems such as poor structural stability, and achieve the effects of alleviating volume changes, excellent conductive channels, and inhibiting dissolution
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[0035] Example 1
[0036] A method for preparing double-layer porous carbon nanofibers for lithium-sulfur batteries includes the following steps:
[0037] 1) Using airflow coaxial electrospinning, the core layer spinning solution and the skin layer spinning solution are simultaneously extruded from the coaxial electrospinning needle, under the action of high-speed airflow and electrostatic voltage, to the receiving net; a skin core is obtained Structure of nano-sized nascent fibers;
[0038] The core spinning solution is obtained by the following steps: 35wt% of polyacrylonitrile (PAN) (Mw=150,000, Aldrich), 13wt% of the pore-forming polymer PS are dissolved in 52wt% of N,N-dimethylformaldehyde In the amide, stir continuously for 24 hours at 70°C and ultrasonically vibrate for 12 hours to obtain a uniform PAN / PS solution;
[0039] The skin spinning solution is obtained by the following steps: dissolving 38wt% of polyacrylonitrile (PAN) (Mw=150,000, Aldrich), 4wt% of zinc acetate (Mw=...
Example
[0052] Examples 2~5
[0053] On the basis of Example 1, the composition of the skin layer spinning solution and the core layer spinning solution were respectively changed (as shown in Table 1) to prepare double-layer porous carbon nanofibers for lithium-sulfur batteries.
[0054] Using the double-layer porous carbon nanofibers prepared in each example, the cathode material was prepared with the method in Example 1, and then the battery was assembled according to the method in Example 1, and the performance test was performed. The results are shown in Table 3.
[0055] Table 1
[0056]
[0057]
Example
[0058] Examples 6-8
[0059] On the basis of Example 1, only the composition of the core spinning solution (as shown in Table 2) was changed to prepare double-layer porous carbon nanofibers for lithium-sulfur batteries.
[0060] Using the double-layer porous carbon nanofibers prepared in each example, the cathode material was prepared with the method in Example 1, and then the battery was assembled according to the method in Example 1, and the performance test was performed. The results are shown in Table 3.
[0061] Table 2
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[0063]
[0064] table 3
[0065]
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