Diaphragm capable of improving sulfur content of positive electrode of lithium-sulfur battery, preparation method and application of diaphragm
A lithium-sulfur battery and sulfur content technology, applied in the application of lithium-sulfur batteries, the field of preparation of lithium-sulfur battery separators, can solve the problems of complex preparation process and process, unfavorable application, etc., and achieve the effect of inhibiting the shuttle effect
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Embodiment example 1
[0028] The first step, preparation of carbon material-coated separator
[0029] The coating material and the binder PVD are dissolved in an appropriate amount of N-methylpyrrolidone (NMP) solvent according to the mass ratio of 8:2 and mixed uniformly to prepare a slurry; the slurry is coated on a commercial polypropylene diaphragm at 60°C Vacuum-dried for 12 hours, and punched into small discs with a diameter of 16 mm with a tablet press to obtain a carbon material-coated separator. The diaphragm is named Carbon Coated Diaphragm.
[0030] The coating material includes carbon black or other carbon materials, wherein the other carbon materials include graphite, carbon nanotubes, graphene and the like.
[0031] The second step is to prepare a separator with a dense membrane, that is, an SEI membrane.
[0032] The carbon material-coated separator prepared in the first step and the lithium sheet are used to form a button battery. The coated carbon layer is used as the positive el...
Embodiment example 2
[0044] The first step, preparation of carbon material-coated separator
[0045] The coating material and the binder PVD are dissolved in an appropriate amount of N-methylpyrrolidone (NMP) solvent according to the mass ratio of 7:3 and mixed uniformly to prepare a slurry; the slurry is coated on a commercial polypropylene diaphragm at 50°C Vacuum-dried for 24 hours, and punched into small discs with a diameter of 16 mm by a tablet press to obtain a carbon material-coated separator. The diaphragm is named Carbon Coated Diaphragm.
[0046] The coating material includes carbon black or other carbon materials, wherein the other carbon materials include graphite, carbon nanotubes, graphene and the like.
[0047] The second step is to prepare a separator with a dense membrane, that is, an SEI membrane.
[0048] The carbon material-coated separator prepared in the first step and the lithium sheet are used to form a button battery. The coated carbon layer is used as the positive elec...
Embodiment example 3
[0052] The first step, preparation of carbon material-coated separator
[0053] The coating material and the binder PVD are dissolved in an appropriate amount of N-methylpyrrolidone (NMP) solvent according to the mass ratio of 8:2 and mixed uniformly to prepare a slurry; the slurry is coated on a commercial polypropylene diaphragm, 55°C Vacuum-dried for 16 hours, and punched into small discs with a diameter of 16 mm with a tablet press to obtain a carbon material-coated separator. The diaphragm is named Carbon Coated Diaphragm.
[0054] The coating material includes carbon black or other carbon materials, wherein the other carbon materials include graphite, carbon nanotubes, graphene and the like.
[0055] The second step is to prepare a separator with a dense membrane, that is, an SEI membrane.
[0056] The carbon material-coated separator prepared in the first step and the lithium sheet are used to form a button battery. The coated carbon layer is used as the positive elec...
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