A porous composite pole piece and its preparation and application in all-solid-state lithium batteries
A pole piece and porous structure technology, applied in the field of all-solid-state lithium battery and its preparation, can solve the problems of affecting the electrochemical performance of the battery, increasing the interface impedance, reducing the energy density of the battery, etc., so as to avoid the increase and decrease of the energy density and uniformity. The effect of interface impedance
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Embodiment 1
[0092] LiMn 2 o 4 , PVDF, acetylene black, NMP solvent, mix according to 8:1:1, solid content is 24%, add 1.5% (as LiMn 2 o 4 , PVDF, acetylene black total weight as a basis) 300nm elemental sulfur powder (standard deviation σ=5nm of particle size). Mix evenly to form a slurry, coat the slurry on the aluminum foil, control the coating thickness to 60 μm, and dry at 110°C for 3 hours; after drying, roll the pole pieces, and then dry at 180°C for 60 minutes. A positive electrode material layer with a porous structure is compounded on the surface of the current collector, and its porosity is 34%.
[0093] Epoxy acrylate resin, triarylsulfonium hexafluoroantimonate and propylene oxide butyl ether are formulated into curing agent according to the ratio of 90:20:5, and curing agent, electrolyte (1MLiPF 6 Mix 1:1 EC and DEC) according to the mass ratio of 1:4, and then soak the dried pole piece in it, after completely soaking, take out the pole piece and place it under a UV lamp ...
Embodiment 2
[0096] LiFePO 4 , PVDF, acetylene black, NMP solvent is mixed according to 9:0.5:1, and solid content is 30%, adds 1% 800nm elemental sulfur powder (standard deviation σ=5nm of particle size) wherein, mixes evenly and is slurry, will The slurry was coated on the aluminum foil, and the coating thickness was controlled to be 80 μm, and dried at 80° C. for 10 hours; after drying, the pole piece was rolled, and then dried at 200° C. for 30 minutes. A positive electrode material layer with a porous structure is compounded on the surface of the current collector, and its porosity is 30%.
[0097] Polyester acrylate resin, triarylsulfonium hexafluoroantimonate and propylene oxide butyl ether are formulated into curing agent according to the ratio of 95:15:5, and curing agent, electrolyte (0.7MLiPF 6 Mix 1:1 EC and DEC) according to the mass ratio of 1:3, soak the dried pole piece in it, after completely soaking, take out the pole piece and place it under a UV lamp to cure for 14s....
Embodiment 3
[0100] LiFePO 4 , PVDF, acetylene black, NMP solvent is mixed according to 8:1:1, and solid content is 28%, adds 1.8% 50nm elemental sulfur powder (standard deviation σ=5nm of particle size) wherein, mixes evenly and is slurry, will The slurry was coated on the aluminum foil, the coating thickness was controlled to be 75 μm, and dried at 100° C. for 6 hours; after drying, the pole piece was rolled, and then dried at 160° C. for 120 minutes. A positive electrode material layer with a porous structure is compounded on the surface of the current collector, and its porosity is 31%.
[0101] Epoxy acrylate resin, triarylsulfonium hexafluoroantimonate and propylene oxide butyl ether are formulated into a curing agent according to the ratio of 100:22:5, and the curing agent and electrolyte (1MLiTFSI dissolved in EC) are prepared according to the mass Mix at a ratio of 1:4.5, soak the dried pole piece in it, take out the pole piece after it is completely soaked, and place it under a ...
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