Electrode plate, electrochemical apparatus, battery module, battery pack, and device
This application relates to the battery field, and specifically, to an electrode plate, an electrochemical apparatus, a battery module, a battery pack, and a device. The electrode plate in this application includes a current collector and an electrode active material layer disposed on at least one surface of the current collector, where the current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer, a single-side thickness D 2 of the conductive layer satisfies 30 nm≤D 2 ≤3 μm, and a conductive primer layer including a conductive material and a bonding agent is further disposed between the current collector and the electrode active material layer. The electrode plate in this application has good machinability. An electrochemical apparatus including the electrode plate has high energy density, good electrical performance, and long-term reliability.
1. An electrode plate, comprising:
a current collector comprising:
a support layer; and
at least one conductive layer arranged on at least one surface of the support layer;
a conductive primer layer arranged on the at least one conductive layer and away from the support layer, the conductive primer layer comprising a conductive material and a bonding agent;
at least one protection layer made of a metal or a metal oxide, the at least one-protection layer further comprising at least one lower protection layer disposed between the at least one conductive layer and the support layer and at least one upper protection layer disposed between the at least one conductive layer and the conductive primer layer; and
an electrode active material layer disposed on the conductive primer layer,
wherein each one of the at least one conductive layer has a thickness D 2 in a range of 30 nm≤D 2 ≤3 μm.
2. The electrode plate according to claim 1 , wherein the conductive layer is a metal conductive layer, and a material of the metal conductive layer is selected from the group consisting of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, aluminum-zirconium alloy, and any combinations thereof;
wherein a material of the support layer is selected from the group consisting of an insulating polymeric material, an insulating polymeric composite material, a conductive polymeric material, and a conductive polymeric composite material;
wherein the insulating polymeric material is selected from the group consisting of polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aramid fiber, polydiformylphenylenediamine, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, poly-p-phenylene terephthamide, poly (p-phenylene ether), polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, p-phenylene sulfide, polyvinylidene fluoride, silicon rubber, polycarbonate, cellulose, amylum, protein, polyvinyl alcohol, polyethylene glycol, and any combinations thereof;
wherein the insulating polymeric composite material is formed by an insulating polymeric material and an inorganic material, wherein the inorganic material is selected from the group consisting of a ceramic material, a glass material, a ceramic composite material, and any combinations thereof;
wherein the conductive polymeric material is selected from the group consisting of a polymeric polysulfur nitride material, a doped conjugated polymeric material, and a combination thereof;
wherein the conductive polymeric composite material is formed by an insulating polymeric material and a conductive material, wherein the conductive material is selected from the group consisting of a conductive carbon material, a metal material, a composite conductive material, and any combinations thereof, the conductive carbon material is selected from the group consisting of carbon black, carbon nano-tube, graphite, acetylene black, graphene, and any combinations thereof, the metal material is selected from the group consisting of nickel, iron, copper, aluminum, and any combinations thereof, and the composite conductive material is selected from the group consisting of nickel-coated graphite powder, nickel-coated carbon fiber, and a combination thereof.
3. The electrode plate according to claim 1 , wherein a thickness D 1 of the support layer satisfies 1 μm≤D 1 ≤30 μm; and a room-temperature Young's modulus E of the support layer satisfies 20 Gpa≥E≥4 Gpa.
4. The electrode plate according to claim 1 , wherein the thickness D 2 of the conductive layer satisfies 300 nm≤D 2 ≤2 μm.
5. The electrode plate according to claim 1 , wherein each one of the at least one protection layer has a thickness D 3 satisfying D 3 ≤ 1/10 D 2 and 1 nm≤D 3 ≤200 nm.
6. The electrode plate according to claim 1 , wherein a weight percentage of the conductive material is 50% to 80%; and
a weight percentage of the bonding agent is 20% to 50%.
7. The electrode plate according to claim 1 , wherein:
the conductive material is selected from the group consisting of a conductive carbon material, a metal material, and a combination thereof, wherein the conductive carbon material is selected from the group consisting of acetylene black, conductive carbon black, one-dimensional conductive carbon, two-dimensional conductive carbon, three-dimensional conductive carbon, and any combinations thereof, wherein the metal material is selected from the group consisting of aluminum powder, iron powder, silver powder, and any combinations thereof;
the bonding agent is selected from the group consisting of styrene butadiene rubber, oil-based polyvinylidene fluoride (PVDF), polyvinylidene fluoride copolymer, sodium carboxymethyl celullose, polystyrene, polyacrylic acid, polytetrafluoroethylene, polyacrylonitrile, polyimide, water-based PVDF, polyurethane, polyvinyl alcohol, polyacrylate, polyacrylic-acid-polyacrylonitrile copolymer, polyacrylate-polyacrylonitrile copolymer, water-based PVDF, polyacrylic acid, polyurethane, polyvinyl alcohol, polyacrylate, polyacrylic-acid-polyacrylonitrile copolymer, polyacrylate-polyacrylonitrile copolymer, and any combinations thereof.
8. The electrode plate according to claim 1 , wherein a single-side thickness H of the conductive primer layer is 0.1 μm to 5 μm; and a ratio of H to D 2 is 0.5:1 to 5:1.
9. The electrode plate according to claim 1 , wherein the electrode active material layer comprises an electrode active material, a bonding agent, and a conductive agent; an average particle diameter D50 of the electrode active material is 5 μm to 15 μm; and a content of the bonding agent in the electrode active material layer is not less than 1 wt % of a total weight of the electrode active material layer.
10. A battery module, comprising a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, wherein each of the positive electrode plate and the negative electrode plate comprises a current collector, the current collector comprising:
a support layer; and
at least one conductive layer arranged on at least one surface of the support layer;
a conductive primer layer arranged on the at least one conductive layer and away from the support layer, the conductive primer layer comprising a conductive material and a bonding agent;
at least one protection layer made of a metal or a metal oxide, the at least one-protection layer further comprising at least one lower protection layer disposed between the at least one conductive layer and the support layer and at least one upper protection layer disposed between the at least one conductive layer and the conductive primer layer; and
an electrode active material layer disposed on the conductive primer layer,
wherein each one of the at least one conductive layer has a thickness D 2 in a range of 30 nm≤D 2 ≤3 μm.
11. The battery module according to claim 10 , wherein the conductive layer is a metal conductive layer, and a material of the metal conductive layer is selected from the group consisting of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, aluminum-zirconium alloy, and any combinations thereof;
wherein a material of the support layer is selected from the group consisting of an insulating polymeric material, an insulating polymeric composite material, a conductive polymeric material, and a conductive polymeric composite material;
wherein the insulating polymeric material is selected from the group consisting of polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, aramid fiber, polydiformylphenylenediamine, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, poly-p-phenylene terephthamide, poly (p-phenylene ether), polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, p-phenylene sulfide, polyvinylidene fluoride, silicon rubber, polycarbonate, cellulose, amylum, protein, polyvinyl alcohol, polyethylene glycol, and any combinations thereof,
wherein the insulating polymeric composite material is formed by an insulating polymeric material and an inorganic material, wherein the inorganic material is selected from the group consisting of a ceramic material, a glass material, a ceramic composite material, and any combinations thereof;
wherein the conductive polymeric material is selected from the group consisting of a polymeric polysulfur nitride material, a doped conjugated polymeric material, and a combination thereof;
wherein the conductive polymeric composite material is formed by an insulating polymeric material and a conductive material, wherein the conductive material is selected from the group consisting of a conductive carbon material, a metal material, a composite conductive material, and any combinations thereof, the conductive carbon material is selected from the group consisting of carbon black, carbon nano-tube, graphite, acetylene black, graphene, and any combinations thereof, the metal material is selected from the group consisting of nickel, iron, copper, aluminum, and any combinations thereof, and the composite conductive material is selected from the group consisting of nickel-coated graphite powder, nickel-coated carbon fiber, and a combination thereof.
12. The battery module according to claim 10 , wherein a thickness D 1 of the support layer satisfies 1 μm≤D 1 ≤30 μm; and a room-temperature Young's modulus E of the support layer satisfies 20 Gpa≥E≥4 Gpa.
13. The battery module according to claim 10 , wherein the thickness D 2 of the conductive layer satisfies 300 nm≤D 2 ≤2 μm.
14. The battery module according to claim 10 , wherein each one of the at least one protection layer has a thickness D 3 satisfying D 3 ≤ 1/10 D 2 and 1 nm≤D 3 ≤200 nm.
15. The battery module according to claim 10 , wherein a weight percentage of the conductive material is 50% to 80%; and
a weight percentage of the bonding agent is 20% to 50%.
16. The battery module according to claim 10 , wherein:
the conductive material is selected from the group consisting of a conductive carbon material, a metal material, and a combination thereof, wherein the conductive carbon material is selected from the group consisting of acetylene black, conductive carbon black, one-dimensional conductive carbon, two-dimensional conductive carbon, three-dimensional conductive carbon, and any combinations thereof, wherein the metal material is selected from the group consisting of aluminum powder, iron powder, silver powder, and any combinations thereof;
the bonding agent is selected from the group consisting of styrene butadiene rubber, oil-based polyvinylidene fluoride (PVDF), polyvinylidene fluoride copolymer, sodium carboxymethyl celullose, polystyrene, polyacrylic acid, polytetrafluoroethylene, polyacrylonitrile, polyimide, water-based PVDF, polyurethane, polyvinyl alcohol, polyacrylate, polyacrylic-acid-polyacrylonitrile copolymer, polyacrylate-polyacrylonitrile copolymer, water-based PVDF, polyacrylic acid, polyurethane, polyvinyl alcohol, polyacrylate, polyacrylic-acid-polyacrylonitrile copolymer, polyacrylate-polyacrylonitrile copolymer, and any combinations thereof.
17. The battery module according to claim 10 , wherein a single-side thickness H of the conductive primer layer is 0.1 μm to 5 μm; and a ratio of H to D 2 is 0.5:1 to 5:1.
18. The battery module according to claim 10 , wherein the electrode active material layer comprises an electrode active material, a bonding agent, and a conductive agent; an average particle diameter D50 of the electrode active material is 5 μm to 15 μm; and a content of the bonding agent in the electrode active material layer is not less than 1 wt % of a total weight of the electrode active material layer.
19. The electrode plate according to claim 1 , wherein the conductive material comprises a two-dimensional conductive carbon material, the two-dimensional conductive carbon material accounting for 1 wt % to 50 wt % of the conductive material, and a particle diameter D50 of the two-dimensional conductive carbon material is 0.01 μm to 0.1 μm.
20. The battery module according to claim 10 , wherein the conductive material comprises a two-dimensional conductive carbon material, the two-dimensional conductive carbon material accounting for 1 wt % to 50 wt % of the conductive material, and a particle diameter D50 of the two-dimensional conductive carbon material is 0.01 μm to 0.1 μm.