▎ 摘　　要

NOVELTY - Foldable graphene current collector comprises a coated current collector and a braided current collector combined with the coated current collector. The braided current collector has a braided portion and a multiple of non-woven parts, and the coated current collector has a coated portion, a non-coated portion and a tab portion. The non-woven portion is fixed to the non-coated portion. USE - Folding-type graphene current collector for use in a lithium ion battery. ADVANTAGE - The folding graphene current collector improves the contact area and bonding force of the active substance and the current collector, improves the pole piece resistance, so as to greatly reduce the battery internal resistance, reduces the use amount of the foil material, conductive agent and bonding agent, improves battery specific energy density, and reduces the battery cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a folded graphene current collector, which involves selecting a metal wire with a diameter of R and an aluminum foil with a length, width and height of mx nx h, weaving into a net-like structure with a length of a and a width of b, and recording it as the current collector (X1); spraying the graphene solution on the surface of X1, drying, and recording as current collector (X2); passing the X2 through the conductive fiber filament solution atomization zone for drying to obtain current collector (X3); preparing the coating current collector, denoted as Y, where selecting graphite for the coating; combining the non-woven portion of X3 and the non-coated portion of Y by welding to obtain a foldable graphene current collector, denoted as Z, where Y is a layer, and the number of layers in X3 is 1-100 layers; coating the area (A) of the current collector Z with a layer of active material, then fold the area B of the current collector Z into the active material, and then coating a active material; and distributing and the B zone of the current collector Z, and the number is 1-100, and number of coating active materials is twice more than the number of the B zone of the current collector Z; and (2) a method for preparing lithium ion battery involves coating the positive electrode slurry on the coating portion A of the current collector Z for the first time using an extrusion sprayer, and then the braiding portion B of Z is folded and laying flat on the coating portion A; (3) applying the second positive electrode slurry through a second extrusion spraying machine, and then fold the braided portion B on the other side and spreading flat on the coating portion A, repeating various times, and drying through the drying tunnel; turning over and performing the same operation, rolling the slices, and obtaining the positive pole piece that can be assembled into the battery; and (4) assembling the positive pole piece, separator, negative pole piece, aluminum plastic film, tabs and electrolyte into a battery.