Lithium-sulfur battery separator material, preparation method thereof and application thereof
A technology of lithium-sulfur batteries and diaphragm materials, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of blocked lithium ion transmission channels, poor cycle performance of lithium-sulfur batteries, and low coulombic efficiency, and achieve improved Coulombic efficiency and cycle stability, good electrochemical advantages, and simple preparation method
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[0019] The preparation method of the composite material of the present invention comprises the following steps:
[0020] Dissolve a certain amount of PW12 powder in a certain amount of DMF solution, stir magnetically for a few minutes, until the PW 12 The powder is completely dissolved to form a uniform and transparent mixed solution, and then a certain amount of PVDF powder is dissolved in the mixed solution, heated in an oil bath, stirred, and left to stand to prepare a uniform spinning solution, which is placed on the PP film by an electrostatic spinning machine. , vacuum drying to obtain a new type of PW 12 / PVDF spinning diaphragm composites.
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[0021] Example 1
[0022] 1) Preparation of PW 12 / Spinning solution for PVDF spinning diaphragm material:
[0023] Take 0.75gPW 12 Dissolved in 5mL DMF solution, heated in an oil bath at 50°C, magnetically stirred for 5 hours, then added 0.5g PVDF powder, magnetically stirred at 50°C for 3 hours to form a uniform and transparent spinning solution, and let stand for several minutes to prepare for static electricity. Spinning use.
[0024] Select a certain amount of PW in this step 12 , DMF and PVDF, under these conditions, a uniform and certain viscosity spinning solution can be formed; the heating temperature is controlled for the purpose of PW 12 , DMF and PVDF are better dissolved together, speed up the reaction, the temperature is too high or too low will have a great impact on the prepared spinning solution.
[0025] 2) Preparation of PW 12 / PVDF spinning diaphragm material:
[0026] The PW obtained in step 1) 12 / PVDF spinning the spinning solution of the diaphr...
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