All-solid-state lithium-sulfur battery composite positive electrode material and preparation method thereof
A composite positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problem of uneven distribution of components in LLZO/C/S composite materials, reversible capacity and cycle life of solid-state lithium-sulfur batteries Poor, reduce the interface impedance of the positive electrode part and the solid electrolyte, etc., to achieve the effect of increasing the reversible specific capacity, promoting the promotion, and reducing the interface impedance
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[0035] The invention provides a preparation method of a composite positive electrode material for an all-solid-state lithium-sulfur battery, comprising the following steps:
[0036] Mix the sulfur source, coating modifier and dispersion medium, dry and grind in sequence to obtain coated sulfur source powder; the coating modifier includes polydopamine, resorcinol-formaldehyde resin, sugar, polyethylene One or more of pyrrolidone, tannic acid, citric acid, polyvinyl alcohol, polypyrrole, vitamin C, polyethylene glycol, asphalt, anthracene and aniline;
[0037] The inorganic solid electrolyte raw material, chelating agent and dispersion solvent are mixed for sol-gel processing to obtain a sol system; the sol system is ground to obtain a solid electrolyte precursor gel powder, and the solid electrolyte precursor gel powder and The dispersant is mixed to obtain solid electrolyte precursor powder; the dispersant includes one or more of Super P, conductive graphite, conductive carbon...
Embodiment 1
[0072] 7.1g of Na 2 SO 4 , 5.1g of glucose, 10mL of deionized water and 10mL of isopropanol were added to the ball mill tank, and the planetary ball mill was used for ball milling at 400rpm for 20h. , to obtain coated sulfur powder;
[0073] 1.03g of C 6 h 8 o 7 ·H 2 O, 0.11g of LiOH, 0.82g of La(NO 3 ) 3 ·6H 2 O, 0.43g of ZrO(NO 3 ) 2 ·6H 2 O and 10 mL of deionized water were mixed, and the resulting solution was heated at 60 °C for 2 h, then heated at 80 °C for 10 h, until most of the solvent was evaporated to dryness, and a yellow-brown sol was formed, then continued heating in a muffle furnace at 250 °C for 2 h, and ground , to obtain dry and porous solid electrolyte precursor gel powder, the obtained solid electrolyte precursor gel powder and 1.21g of Super P are mixed to obtain solid electrolyte precursor powder;
[0074] The obtained coated sulfur powder and solid electrolyte precursor powder were uniformly mixed, placed in a tube furnace, and under the condit...
Embodiment 2
[0082] 13.4g of Na 2 SO 4 ·7H 2 O. Add 5.1g of glucose, 10mL of deionized water and 10mL of isopropanol into the ball mill tank, use a planetary ball mill to mill at 400rpm for 20h, and dry the slurry obtained by ball milling in a blast oven at 60°C for ~h Grinding to obtain coated sulfur powder;
[0083] 1.03g of C 6 h 8 o 7 ·H 2 O, 0.11g of LiOH, 0.82g of La(NO 3 ) 3 ·6H 2 O, 0.43g of ZrO(NO 3 ) 2 ·6H 2 O and 10 mL of deionized water were mixed, and the resulting solution was heated at 60 °C for 2 h, then heated at 80 °C for 10 h, until most of the solvent was evaporated to dryness, and a yellow-brown sol was formed, then continued heating in a muffle furnace at 250 °C for 2 h, and ground , to obtain dry and porous solid electrolyte precursor gel powder, the obtained solid electrolyte precursor gel powder and 1.21g of Super P are mixed to obtain solid electrolyte precursor powder;
[0084] The obtained coated sulfur powder and solid electrolyte precursor powder ...
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