Structured all-solid-state battery composite positive electrode, preparation method thereof and all-solid-state battery
An all-solid-state battery and cathode technology, applied in the field of electrochemistry, can solve the problem of reducing the energy density of the cathode complex, and achieve the effects of high energy density, high active material content, high energy and high density
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Embodiment 1
[0032] The positive machine active material powder lithium cobalt oxide is evenly mixed with carbon fiber in a proportion of 70:30, and 2% PVA aqueous solution with a concentration of 12% is added for tableting. The thickness of the tablet is 1-3μm, and the pressure conditions: 15 MPa for 2 minutes. The pretreated sheet of the positive electrode was treated under oxygen at 500°C for 4 hours, and the carbon fibers were removed to leave continuous fiber micropores, which were then placed in a drying oven for drying at 60°C for later use. Lithium germanium phosphorus sulfur (LGPS) is mixed with tetrahydrofuran to prepare a nighttime colloid without precipitation. The particle size of the electrolyte powder is 50~100nm, and the ratio of electrolyte to organic solvent is 1:5. The liquid colloid is used for injection coating on one side of the positive electrode sheet, and the coating thickness is controlled between 100 and 500 nm. Place the coated surface of the coated positive e...
Embodiment 2
[0034] The positive active material powder lithium iron phosphate is uniformly mixed with PMMA fiber in a volume ratio of 85:15, and 1% PEO aqueous solution with a concentration of 15% is added, and the tablet is compressed. The thickness of the tablet is about 100 μm, and the pressure condition is 10MPa. 5 minutes. The positive electrode pretreated sheet was treated under dry air at 50°C for 2 hours, the fibers were removed, leaving continuous fiber micropores, and then placed in a drying oven for drying at 50°C for later use. Mix Lithium Phosphorus Sulfur (LPS) with acetonitrile to prepare a liquid colloid without precipitation. The particle size of the electrolyte powder is 50~100nm, and the ratio of electrolyte to organic solvent is 1:10. The liquid colloid was used to coat one side of the positive electrode sheet with a coating thickness of 100 nm. Place the coated surface of the coated positive electrode sheet on the negative pressure guiding infiltration equipment, an...
Embodiment 3
[0037] The positive active material powder nickel-cobalt-manganese-lithium is uniformly mixed with plant fibers in a volume ratio of 80:20, and 1% of PVA with an agricultural degree of 10% is added to dissolve in water and then pressed into tablets. The thickness of the tablet is 100μm, and the pressure condition is 50MPa. Hold for 1 minute. The positive electrode pretreated sheet was treated under dry air at 100°C for 4 hours, the carbon fibers were removed leaving continuous fiber micropores, and then placed in a drying oven for drying at 80°C for later use. Lithium phosphorus sulfur chloride (LPSCl) is mixed with xylene to prepare a liquid colloid without precipitation. The particle size of the electrolyte powder is 100nm, and the ratio of electrolyte to organic solvent is 1:5. This liquid colloid is used to coat one side of the positive electrode sheet. It was placed on the negative pressure guiding infiltration equipment, and part of the coated colloid was poured into th...
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