Lithium supplementing material and positive electrode containing same
A lithium supplementing material includes Li 5 MO 4 and a semiconductor oxide on a surface thereof, where M includes at least one of Fe, Ni, Mn, Ru, Cr, Cu, Nb, Al, or Mo. In this application, the lithium supplementing material containing the semiconductor oxide is used, which can significantly enhance electronic conductance of the lithium supplementing material, reduce polarization, and greatly improve a specific charge capacity of the lithium supplementing material. Applying the lithium supplementing material to a positive electrode of an electrochemical apparatus can effectively increase an energy density of the electrochemical apparatus, and also improve rate performance and cycle stability.
1 . A positive electrode, comprising: a positive active material, a conductive agent, a binder, and a lithium supplementing material; wherein the lithium supplementing material comprises Li 5 MO 4 and a semiconductor oxide on a surface thereof, wherein M comprises at least one of Fe, Ni, Mn, Ru, Cr, Cu, Nb, Al, or Mo;
wherein the semiconductor oxide is one of indium tin oxide or antimony tin oxide;
wherein in a case where the semiconductor oxide is the indium tin oxide, a molar ratio of tin to indium in the semiconductor oxide is 0.1:1 to 0.5:1; and
wherein in a case where the semiconductor oxide is antimony tin oxide, a molar ratio of antimony to tin in the semiconductor oxide is 0.1:1 to 0.5:1.
2 . The positive electrode according to claim 1 , wherein the positive active material comprises at least one of lithium cobaltate, lithium iron phosphate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium vanadate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, a lithium-rich manganese-based material, or lithium nickel cobalt aluminate.
3 . The positive electrode according to claim 1 , wherein the conductive agent comprises at least one of conductive carbon black, carbon fiber, acetylene black, Ketjen black, graphene, or carbon nanotube; and the binder comprises at least one of polypropylene, polyethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene, polytetrafluoroethylene, or polyhexafluoropropylene.
4 . A positive electrode, comprising: a positive active material, a conductive agent, a binder and a compound derived from delithiation of a lithium supplementing material; wherein the compound derived from delithiation of a lithium supplementing material comprises LiMO 2 , wherein the lithium supplementing material comprises a semiconductor oxide on a surface thereof, and wherein M comprises at least one of Fe, Ni, Mn, Ru, Cr, Cu, Nb, Al, or Mo;
wherein the semiconductor oxide is one of indium tin oxide or antimony tin oxide;
wherein in a case where the semiconductor oxide is the indium tin oxide, a molar ratio of tin to indium in the semiconductor oxide is 0.1:1 to 0.5:1; and
wherein in a case where the semiconductor oxide is antimony tin oxide, a molar ratio of antimony to tin in the semiconductor oxide is 0.1:1 to 0.5:1.
5 . The positive electrode according to claim 4 , wherein the lithium supplementing material comprises Li 5 MO 4 having the semiconductor oxide on the surface thereof.
6 . The positive electrode according to claim 4 , wherein the positive active material comprises at least one of lithium cobaltate, lithium iron phosphate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium vanadate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, a lithium-rich manganese-based material, or lithium nickel cobalt aluminate.
7 . The positive electrode according to claim 4 , wherein the conductive agent comprises at least one of conductive carbon black, carbon fiber, acetylene black, Ketjen black, graphene, or carbon nanotube; and the binder comprises at least one of polypropylene, polyethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene, polytetrafluoroethylene, or polyhexafluoropropylene.
8 . An electronic apparatus, comprising an electrochemical apparatus, the electrochemical apparatus comprises a positive electrode comprising: a positive active material, a conductive agent, a binder and a lithium supplementing material; wherein the lithium supplementing material comprises Li 5 MO 4 and a semiconductor oxide on a surface thereof, wherein M comprises at least one of Fe, Ni, Mn, Ru, Cr, Cu, Nb, Al, or Mo;
wherein the semiconductor oxide is one of indium tin oxide or antimony tin oxide;
wherein in a case where the semiconductor oxide is the indium tin oxide, a molar ratio of tin to indium in the semiconductor oxide is 0.1:1 to 0.5:1; and
wherein in a case where the semiconductor oxide is antimony tin oxide, a molar ratio of antimony to tin in the semiconductor oxide is 0.1:1 to 0.5:1.
9 . An electronic apparatus, comprising an electrochemical apparatus, the electrochemical apparatus comprises the positive electrode according to claim 4 .
10 . The positive electrode according to claim 1 , wherein the semiconductor oxide is the indium tin oxide.
11 . The positive electrode according to claim 1 , wherein the Li 5 MO 4 comprises at least one of Li 5 FeO 4 or Li 5 AlO 4 .
12 . The positive electrode according to claim 1 , wherein the semiconductor oxide is the antimony tin oxide.
13 . The electronic apparatus according to claim 8 , wherein the semiconductor oxide is the indium tin oxide.
14 . The electronic apparatus according to claim 8 , wherein the Li 5 MO 4 comprises at least one of Li 5 FeO 4 or Li 5 AlO 4 .
15 . The electronic apparatus according to claim 8 , wherein the semiconductor oxide is the antimony tin oxide.
16 . The positive electrode according to claim 1 , wherein a weight percentage of the semiconductor oxide is 0.5 wt % to 3 wt %.
17 . The positive electrode according to claim 4 , wherein a weight percentage of the semiconductor oxide is 0.5 wt % to 3 wt %.
18 . The electronic apparatus according to claim 8 , wherein a weight percentage of the semiconductor oxide is 0.5 wt % to 3 wt %.