Electrode plate, electrochemical apparatus, and apparatus thereof
This application relates to an electrode plate, an electrochemical apparatus, and an apparatus thereof. The electrode plate in this application comprises a current collector, an electrode active material layer disposed on at least one surface of the current collector, and an electrical connection member electrically connected to 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-sided thickness D2 of the conductive layer satisfies: 30 nm≤D2≤3 μm, and the support layer is a polymer material layer or a polymer composite material layer; and the electrode active material layer includes an electrode active material, a binder, and a conductive agent, and viewed in a width direction of a coated surface of the electrode plate, the electrode active material layer includes 2n+1 zones based on compacted density.
1. An electrode plate, comprising a current collector, an electrode active material layer disposed on at least one surface of the current collector, and an electrical connection member electrically connected to the current collector, wherein
the electrode active material layer is disposed on a main body portion of the current collector at a zone referred to as a film zone, the electrical connection member and the current collector are welded and connected at an edge of the current collector at a welding zone referred to as a transfer welding zone, and a transition zone of the current collector between the film zone and the transfer welding zone, coated with no electrode active material layer, is referred to as an extension zone;
the current collector comprises a support layer and a conductive layer disposed on at least one surface of the support layer, a single-sided thickness D2 of the conductive layer satisfies: 30 nm≤D2≤3 μm, and the support layer is a polymer material layer or a polymer composite material layer; and
the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, viewed in a width direction of a coated surface of the electrode plate, the electrode active material layer comprises 2n+1 zones based on compacted density, compacted density of a middle zone is greater than compacted density of zones on both sides, wherein n=1, 2, or 3, and a support protection layer is disposed on a surface of the extension zone of the current collector.
2. The electrode plate according to claim 1 , wherein the support protection layer is an organic insulation layer or an inorganic insulation layer;
the organic insulation layer is selected from an insulation tape layer or an insulation glue coating layer; and
the inorganic insulation layer is selected from at least one of an aluminum oxide layer, a magnesium oxide layer, a zinc oxide layer, a silicon oxide layer, a titanium oxide layer, a zirconium oxide layer, an aluminum nitride layer, a silicon nitride layer, a calcium fluoride layer, and a barium fluoride layer.
3. The electrode plate according to claim 2 , wherein the inorganic insulation layer comprises inorganic insulation particles and a binder, a percentage of the inorganic insulation particles is 50 wt % to 98 wt %, and a percentage of the binder is 2 wt % to 50 wt %.
4. The electrode plate according to claim 3 , wherein the inorganic insulation particles are selected from at least one of aluminum oxide, magnesium oxide, zinc oxide, silicon oxide, titanium oxide, zirconium oxide, aluminum nitride, silicon nitride, calcium fluoride, and barium fluoride, and the binder is selected from at least one of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, styrene butadiene rubber, sodium carboxymethyl cellulose, polyacrylic acid, polyethylene oxide, and polyvinyl alcohol.
5. The electrode plate according to claim 1 , wherein a conductive primer coating layer comprising a binder and a conductive material is provided between the current collector in the film zone and the electrode active material layer and/or on a surface of the current collector in the extension zone.
6. The electrode plate according to claim 5 , wherein based on a total weight of the conductive primer coating layer, a percentage of a conductive material by weight is 10% to 99%; and a percentage of the binder by weight is 1% to 90%.
7. The electrode plate according to claim 5 , wherein a single-sided thickness H of the conductive primer coating layer is 0.1 μm to 5 μm; and/or
the binder in the conductive primer coating layer comprises an aqueous binder; and/or
the conductive material is a mixed material of a zero-dimensional conductive carbon material and a one-dimensional conductive carbon material or a mixed material of a zero-dimensional conductive carbon material and a two-dimensional conductive carbon material.
8. 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 at least one of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy; and/or
a material of the support layer is selected from at least one of an insulation polymer material, an insulation polymer composite material, a conductive polymer material, and a conductive polymer composite material.
9. The electrode plate according to claim 1 , wherein a thickness DI of the support layer satisfies: 1 μm≤D1≤15 μm; and/or
a room-temperature Young's modulus E of the support layer satisfies: 20 GPa≥E≥1.9 GPa; and/or
there are cracks in the conductive layer.
10. The electrode plate according to claim 1 , wherein the electrode active material layer comprises 2n+1 zones based on the compacted density, and n=1.
11. The electrode plate according to claim 6 , wherein based on a total weight of the conductive primer coating layer, a percentage of a conductive material by weight is 20% to 80%.
12. The electrode plate according to claim 6 , wherein based on a total weight of the conductive primer coating layer, a percentage of a conductive material by weight is 50% to 80%.
13. The electrode plate according to claim 6 , wherein a percentage of the binder by weight is 20% to 80%.
14. The electrode plate according to claim 6 , wherein a percentage of the binder by weight is 20% to 50%.
15. The electrode plate according to claim 7 , wherein a single-sided thickness H of the conductive primer coating layer is a ratio of H to D2 is 0.5:1 to 5:1.
16. The electrode plate according to claim 8 , wherein the current collector is further provided with a protection layer, the protection layer is disposed on one surface of the conductive layer of the current collector or disposed on two surfaces of the conductive layer of the current collector, and the protection layer is a metal protection layer or a metal oxide protection layer.
17. An electrochemical apparatus, comprising a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution, wherein the positive electrode plate and/or the negative electrode plate are/is the electrode plate according to claim 1 .
18. An apparatus, comprising the electrochemical apparatus according to claim 17 .
19. The electrode plate according to claim 2 , wherein the insulation glue coating layer is selected from at least one of a polyvinylidene fluoride layer, a vinylidene fluoride-hexafluoropropylene copolymer layer, a styrene butadiene rubber layer, a sodium carboxymethyl cellulose layer, a polyacrylic acid layer, a sodium polyacrylate layer, a polyepoxy ethane layer, and a polyvinyl alcohol layer.
20. The electrode plate according to claim 8 , wherein the material of the support layer is an insulation polymer material or an insulation polymer composite material.