A novel lithium-ion battery positive pole piece, its use and a modification method for the pole piece
A technology of lithium-ion batteries and positive pole pieces, applied in the field of electrochemistry, can solve the problems of low specific capacity of lithium-ion positive electrode materials, achieve excellent discharge specific capacity, reduce interface impedance, and shorten the transmission path
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Embodiment 1
[0036] (1) Weigh lithium iron phosphate material (LiFePO 4 , LFP), conductive agent and binder, wet mixed with NMP (N-Methylpyrrolidone, N-methylpyrrolidone) as a solvent, coated on aluminum foil, and dried to obtain a low-voltage cathode material on one side of the aluminum foil The pole piece is used as a modified pole piece; the conductive agent is acetylene black, and the binder is PVDF (Polyvinylidene Fluoride, polyvinylidene fluoride);
[0037] (2) Weigh the positive electrode active material lithium nickel cobalt aluminate (LiNi 0.8 co 0.15 Al 0.05 o 2 , NCA), conductive agent and binding agent, obtain positive electrode slurry after wet mixing with NMP as solvent;
[0038] (3) Use the modified pole piece made in step (1) as a current collector, coat a layer of positive electrode slurry made in step (2) on its surface, and obtain the modified positive pole piece Al- LFP-NCA.
[0039] Among them, one side of the aluminum foil contains a coating of low-voltage posit...
Embodiment 2
[0045] (1) Weigh the graphene material (grapheme, GR), conductive agent and binder according to the mass ratio of 8:1:1, use NMP as the solvent to wet mix, coat on the aluminum foil, and obtain the aluminum foil after drying. A pole piece containing a low-voltage positive electrode material is used as a modified pole piece; the conductive agent is acetylene black, and the binder is PVDF or polyvinylidene fluoride;
[0046] (2) Weigh the positive electrode active material lithium nickel cobalt aluminate (LiNi 0.8 co 0.15 al 0.05 o 2 , NCA), conductive agent and binding agent, obtain positive electrode slurry after wet mixing with NMP as solvent;
[0047] (3) Use the modified pole piece made in step (1) as a current collector, coat a layer of positive electrode slurry made in step (2) on its surface, and obtain the modified positive pole piece Al- GR-NCA.
[0048] One side of the aluminum foil contains a coating of low-voltage cathode material with a thickness of 5 μm.
[...
Embodiment 3
[0052] (1) Weigh the sulfur material (S), conductive agent and binder at a mass ratio of 8:1:1, wet mix them with NMP as a solvent, coat them on aluminum foil, and dry them to obtain low The pole piece of voltage positive electrode material is used as a modified pole piece; the conductive agent is acetylene black, and the binder is PVDF or polyvinylidene fluoride;
[0053] (2) Weigh the cathode active material lithium iron phosphate (LiFePO 4 , LFP), a conductive agent and a binder, and NMP is used as a solvent to wet mix to obtain a positive electrode slurry;
[0054] (3) Use the modified pole piece made in step (1) as a current collector, coat a layer of positive electrode slurry made in step (2) on its surface, and obtain the modified positive pole piece Al- S-LFP.
[0055] One side of the aluminum foil contains a coating of low-voltage cathode material with a thickness of 5 μm.
[0056] The coating of the positive electrode active material has a thickness of 100 μm.
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