A kind of solid-state lithium battery electrode/solid electrolyte interface modification layer and its preparation method and application
A solid electrolyte and battery electrode technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of no improvement of the positive electrode side interface, large interface impedance, poor conductivity, etc., to improve the interface electrochemical Stability, reduced interface impedance, and low cost effects
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[0047] As a LiFePO 4 An example of the preparation method of the positive electrode sheet, including: first LiFePO 4 Powder, conductive carbon, and binder are mixed in N-methylpyrrolidone at a mass ratio of 8:1:1, and then ball milled for 6 hours to obtain a uniform slurry, and then the slurry is coated on the Aluminum foil, dried and cut into discs with a diameter of 12mm.
[0048] As an example of the preparation method of an S / C composite positive electrode, it includes: first dispersing S / C powder, conductive carbon, and binder with a sulfur content of 70wt% in distilled water at a mass ratio of 8:1:1, and then Uniform slurry was obtained after ball milling for 6 hours, and then the slurry was coated on aluminum foil using a roll-to-roll coater, dried and cut into discs with a diameter of 12 mm.
[0049] In the present disclosure, there is no restriction on the structure of the solid-state lithium battery, which may be a plastic-sealed pouch battery, a tubular battery, o...
Embodiment 1
[0052] (1) Preparation of NASICON-type solid electrolyte Li by solid-state sintering method 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 Ceramic sheet (a disc with a diameter of 1.4 cm);
[0053] (2) Disperse 0.2g of 1-vinyl-3-ethylimidazole bistrifluoromethanesulfonimide salt, 0.3g of lithium hexafluorophosphate, and 0.01g of 1-hydroxy-cyclohexyl-phenyl ketone in 1.49g of tetrahydrofuran to form a single Body dispersion;
[0054] (3) Take 20 μL of the monomer dispersion in step (2) to the surface of the above-mentioned ceramic sheet, at a wavelength of 256 nm and an intensity of 60 μW / cm 2 Irradiate under ultraviolet light for 3min, remove the light source. Such as figure 2 As shown, after the solvent is completely evaporated, the thickness of the obtained modified layer is about 2 μm. Then attach a metal lithium negative electrode (a disc with a diameter of 1.2 cm) on its surface;
[0055] (4) Take 20 μL of the monomer dispersion liquid in step (2) to the other surface of the ceram...
Embodiment 2
[0059] (1) Preparation of Garnet-type solid electrolyte Li by solid-state sintering method 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Ceramic sheet (a disc with a diameter of 1.4 cm);
[0060](2) Disperse 0.2g of 1-vinyl-3-ethylimidazole bistrifluoromethanesulfonimide salt, 0.3g of lithium hexafluorophosphate, and 0.01g of 1-hydroxy-cyclohexyl-phenyl ketone in 1.49g of tetrahydrofuran to form a single Body dispersion;
[0061] (3) Take 20 μL of the monomer dispersion in step (2) to the surface of the above-mentioned ceramic sheet, at a wavelength of 256 nm and an intensity of 60 μW / cm 2 Irradiate under ultraviolet light for 3 minutes, remove the light source, and wait until the solvent is completely evaporated, and the thickness of the obtained modified layer is about 2 μm. Then attach a lithium indium alloy negative electrode (a disc with a diameter of 1.2cm) on its surface;
[0062] (4) Take 20 μL of the monomer dispersion in step (2) to the other surface of the ceramic sheet and th...
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