Preparation method of porous high-load electrode for lithium-sulfur battery

[0039] A method for preparing a porous high-capacity positive electrode for lithium-sulfur batteries, the process flow can be found in figure 1 , including the following steps:

[0040] 1) Preparation of sulfur-carbon film layer: first prepare sulfur-carbon mixture (sublimated sulfur-ketjen black), the specific operation is to put sublimated sulfur and ketjen black into a powder machine with a mass ratio of 4:1 and mix them evenly. about 15s each time, 3 times in total; then put it into the reaction kettle, vacuum seal it, place it in a blast drying oven, melt it at 155°C for 12 hours, take it out, and set it aside for use. Sulfur-carbon mixture (8.90g), conductive agent Ketjen black (0.5g), ethanol (30mL), NH 4 HCO 3 (with a particle size of 0.1-0.3 mm) was added into a planetary mixer, started the planetary mixer and stirred at a speed of 600 rpm for 3 hours until the slurry was uniform, and then stopped stirring to obtain an initial slurry. Then add binder (60wt.% PTFE emul

[0044] A method for preparing a porous high-capacity positive electrode for lithium-sulfur batteries. The difference from Example 1 is that the pore-forming agent NH 4 HCO 3 The content of the sulfur-carbon film layer prepared in step (1) is 20wt.% of the sum of the mass of the sulfur-carbon mixture, binder and conductive agent. All the other steps are consistent with Example 1.

[0046] A method for preparing a porous high-capacity positive electrode for lithium-sulfur batteries. The difference from Example 1 is that the pore-forming agent NH 4 HCO 3 The content of the sulfur-carbon film layer prepared in the step (1) is 30wt.% of the sum of the mass of the sulfur-carbon mixture, binder and conductive agent. All the other steps are consistent with Example 1.