Positive electrode current collector and positive electrode plate, battery, battery module, battery pack, and apparatus containing such positive electrode current collector
A positive electrode current collector and a positive electrode plate, a battery, a battery module, a battery pack, and an apparatus including the positive electrode current collector are provided. In some embodiments, a positive electrode current collector is provided, including an organic support layer and an aluminum-based conductive layer disposed on at least one surface of the organic support layer, where the aluminum-based conductive layer contains Al and at least one modifying element selected from O, N, F, B, S, and P, an XPS spectrogram of the aluminum-based conductive layer with a surface passivation layer removed through etching has at least a first peak falling in a range of 70 eV to 73.5 eV and a second peak falling in a range of 73.5 eV to 78 eV, and a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x≤3.0.
1. A positive electrode plate, comprising:
a current collector comprising an organic support layer and a conductive layer disposed on at least one surface of the organic support layer; and
an electrode active material layer disposed on the conductive layer,
wherein the conductive layer comprises aluminum (Al) and at least one modifying element selected from the group consisting of oxygen (O), nitrogen (N), fluorine (F), boron (B), sulfur (S), phosphorus (P), and a combination thereof, wherein an X-ray photoelectron spectroscopy (XPS) spectrogram of the conductive layer has at least a first peak representing elemental aluminum (Al 0 ) and a second peak representing a compound containing aluminum (Al 3+ ), wherein a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x≤3.0.
2. The positive electrode plate according to claim 1 , wherein the ratio x of the peak intensity of the second peak to that of the first peak satisfies 0.1≤x≤1.5.
3. The positive electrode plate according to claim 1 , wherein a peak position of the first peak is in a range of 70 eV to 73.5 eV, and a peak position of the second peak is in a range of 73.5 eV to 78 eV.
4. The positive electrode plate according to claim 1 , wherein the compound containing aluminum (Al 3+ ) represented by the second peak is selected from the group consisting of Al 2 O 3 , AlN, AlF 3 , and a combination thereof.
5. The positive electrode plate according to claim 1 , wherein a weight percentage of Al in the conductive layer is 90 wt % or more.
6. The positive electrode plate according to claim 1 , wherein a weight percentage of the modifying element in the conductive layer is 5 wt % or less.
7. The positive electrode plate according to claim 1 , wherein the organic support layer comprises at least one selected from the group consisting of polyurethane, polyamide, polyterephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, poly(p-phenylene terephthalamide), poly(p-phenylene ether), polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, polycarbonate, polyphenylene sulfide, and a combination thereof.
8. The positive electrode plate according to claim 1 , wherein the conductive layer of the current collector further comprises a protective layer on a surface of the conductive layer, the protective layer comprising Al.
9. The positive electrode plate according to claim 8 , wherein an X-ray photoelectron spectroscopy (XPS) spectrogram of a surface of the protective layer has at least a third peak falling in a range of 70 eV to 73.5 eV and a fourth peak falling in a range of 73.5 eV to 78 eV, and a ratio y of peak intensity of the fourth peak to that of the third peak satisfies 1.5<y≤4.0.
10. The positive electrode plate according to claim 1 , wherein the electrode active material comprises one or more lithium transition metal oxides selected from the group consisting of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, and a combination thereof.
11. The positive electrode plate according to claim 1 , wherein the electrode active material comprises one or more lithium-containing phosphates with an olivine structure selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium manganese iron phosphate, and a combination thereof.
12. The positive electrode plate according to claim 1 , wherein the electrode active material comprises a lithium transition metal oxide represented by formula:
Li a Ni b Co c M d O e A f ,
wherein 0.8≤a≤1.2, 0.5≤b<1, 0<c<1, 0<d<1, 1≤e≤2, and 0≤f≤1, M is selected from the group consisting of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, B, and a combination thereof, and A is selected from the group consisting of N, F, S, Cl, or a combination thereof.
13. The positive electrode plate according to claim 1 , wherein a thickness of the conductive layer is D1, and D1 satisfies 0.1 μm≤D1≤5 μm.
14. A battery, comprising:
an electrode assembly comprising a positive electrode plate, a separator, and a negative electrode plate stacked in sequence,
wherein the positive electrode plate comprises:
a current collector comprising an organic support layer and a conductive layer disposed on at least one surface of the organic support layer; and
an electrode active material layer disposed on the conductive layer,
wherein the conductive layer comprises Al and at least one modifying element selected from the group consisting of oxygen (O), nitrogen (N), fluorine (F), boron (B), sulfur (S), phosphorus (P), and a combination thereof, wherein an X-ray photoelectron spectroscopy (XPS) spectrogram of the conductive layer has at least a first peak representing elemental aluminum (Al 0 ) and a second peak representing a compound containing aluminum (Al 3+ ), wherein a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x≤3.0.
15. The battery according to claim 14 , wherein the ratio x of the peak intensity of the second peak to that of the first peak satisfies 0.1≤x≤1.5.
16. The battery according to claim 14 , wherein a peak position of the first peak is in a range of 70 eV to 73.5 eV, and a peak position of the second peak is in a range of 73.5 eV to 78 eV.
17. The battery according to claim 14 , wherein the compound containing aluminum (Al 3+ ) represented by the second peak is selected from the group consisting of Al 2 O 3 , AlN, AlF 3 , and a combination thereof.
18. A method for preparing a positive electrode current collector, comprising:
forming an organic support layer; and
forming a conductive layer on a surface of the organic support layer,
wherein the conductive layer comprises Al and at least one modifying element selected from the group consisting of oxygen (O), nitrogen (N), fluorine (F), boron (B), sulfur (S), phosphorus (P), and a combination thereof, wherein an X-ray photoelectron spectroscopy (XPS) spectrogram of the conductive layer has at least a first peak representing elemental aluminum (Al 0 ) and a second peak representing a compound containing aluminum (Al 3+ ), wherein a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x≤3.0.
19. The method of claim 18 , wherein forming the conductive layer further comprises:
mixing evaporated Al with a gas comprising the modifying element to form a compound containing aluminum (Al 3+ ); and
depositing Al and the compound containing aluminum (Al 3+ ) onto the surface of the organic support layer.
20. The method of claim 18 , wherein forming the conductive layer further comprises:
placing an Al-based foil and the organic support layer in a mechanical roller;
introducing a gas comprising the modifying element to react with the Al-based foil to form the compound containing aluminum (Al 3+ ); and
applying a pressure to bond the Al-based foil and the organic support layer.