Abstract: The present application provides a positive electrode active material, a positive electrode sheet and a lithium-ion battery. When the battery, which is formed by the positive electrode active material and a lithium metal negative electrode, is discharged to a discharge cut-off voltage of 3.0 V at a rate of less than 1 C after being charged to a SOC of 100% at a rate of less than 1 C with a charge cut-off voltage of 4.55 V to 4.65 V, the number N of discharge peaks in the capacity-voltage differential curve of the battery is not less than 4. Under high-voltage condition, the positive electrode active material not only has excellent specific capacity and cycling performance, but also has more prominent rate performance.

Abstract: Disclosed are a positive electrode material, a preparation method of a positive electrode material, a positive electrode plate, and a battery. The positive electrode material includes a sodium-containing oxide, an angle range of a first characteristic peak of the sodium-containing oxide is less than an angle range of a second characteristic peak, the first characteristic peak is a characteristic peak of the sodium-containing oxide at an initial voltage, the second characteristic peak is a characteristic peak of the sodium-containing oxide at a cut-off voltage, and a chemical formula of the sodium-containing oxide is LixNa1-xCo1-z MzO2. M includes a metal element or a non-metal element, 0.7<x<1, and 0.001<z<0.03.

Abstract: Disclosed are a positive electrode material, and a positive electrode plate and a battery including the positive electrode material. The positive electrode material provided by the present disclosure is good in structural stability, and a battery formed by the positive electrode material has excellent cycling performance. According to the positive electrode material provided by the present disclosure, through a type and a doping amount of a doped A element, on one hand, a morphology of the positive electrode material is directionally controlled, and a press density of the positive electrode material is improved, so that an energy density of a positive plate is improved; on the other hand, an oxygen stability in the positive electrode material is improved by an A-O bond formed by the doped element A and oxygen atoms in a crystal, so that the positive electrode material has relatively high gram volume and voltage platform.

Abstract: The present application provides a positive electrode active material and its use, where the positive electrode active material includes a lithium metal oxide as shown in Formula 1 or Formula 2; in an X-ray diffraction spectrum, the lithium metal oxide has a Cmca space group of a cubic lattice structure, and has a 002 peak with a 2? of 17.9°-18.1°, and a 131 peak with a 2? of 67.0°-67.5°. The positive electrode active material of the present application is beneficial to improving the cycle performance and specific capacity of lithium-ion batteries.

Abstract: A positive electrode active material and the use thereof where the positive electrode active material includes a lithium metal oxide and a lithium-rich material. In an X-ray diffraction pattern, the lithium metal oxide is a space group Cmca of a cubic crystal system, and has a 002 peak at 2? of 17.9°-18.1° and a 131 peak at 2? of 67.0°-67.5°. The lithium-rich material is selected from at least one of Li2NiO2, Li6FeO6, Li2MoO3, Li6CoO4, Li2CuO2, Li2O, Li3N, LiF, LisAlO4, Li5FeO4, and Li2C2O4. The positive electrode active material helps to improve the specific capacity and cycle performance of batteries.

Abstract: Disclosed are a positive electrode material, and a positive electrode plate and a battery including the positive electrode material. The positive electrode material has a special phase structure distinct from that of a conventional lithium cobalt oxide material. The positive electrode material may present a plurality of small charging and discharging platforms in a charging and discharging process. Compared with a conventional high-voltage lithium cobalt oxide material, the positive electrode material exhibits the following advantage in terms of electrochemical performance: under a condition that a charge-discharge cut-off voltage and a charge and discharge rate remain the same, the positive electrode material has higher gram capacity performance and cycling performance. Specifically, compared with an undoped compound that belongs to a P63mc space group and has an O2 phase packed structure, the compound has higher gram capacity and better cycling performance due to an effect of element potassium.

Abstract: Disclosed are a positive electrode material, and a positive electrode plate and a battery including the positive electrode material. The positive electrode material includes a positive electrode active material and a coating material on a surface of the positive electrode active material; a median particle size Dv50 of the positive electrode material ranges from 2 ?m to 7 ?m; a chemical formula of the positive electrode active material is LiaFexMn1-x-y-zMyNzPO4, where M and N are co-doping elements, 0.9?a?1.1, 0?x?1, 0?y?0.02, and 0?z?0.02; and a median particle size Dv50 of the positive electrode material ranges from 2 ?m to 7 ?m. Therefore, a battery having a relatively high dynamic performance, low-temperature discharge performance, and safety performance may be obtained.

Abstract: Disclosed are a positive electrode material, and a positive electrode plate including the positive electrode material and a battery. The positive electrode material including lithium cobalt oxide with an O3 phase structure and lithium cobalt oxide with an O2 phase structure in the present disclosure has a higher capacity and a significantly improved rate while also having excellent cycling performance.

Abstract: The present application discloses a positive electrode and a battery, which can solve safety problems faced by a high-energy-density battery, and prevent the problems that an initial direct-current internal resistance (DCIR) of the battery is too large, an increase change rate of the DCIR is large and a cycle performance deteriorates during cycle process. The present application provides a positive electrode piece, including a positive electrode current collector, a safety layer and an active substance layer, where the safety layer is arranged on a surface of the positive electrode current collector; the active substance layer is arranged on a surface of the safety layer; the safety layer and the active substance layer each contain Co and Al, where a mass ratio of a total amount of Co to a total amount of Al in the safety layer and the active substance layer is (12-85):1.

Abstract: Disclosed is a lithium-ion battery, where the lithium-ion battery includes a positive electrode active material, and the positive electrode active material includes lithium cobalt oxide particles doped with one or more elements of Al, Mg, Ti, Zr, Ni, Mn, Y, La, Sr, W, or Sc. When the lithium-ion battery is in an SOC of 0%, a molar ratio of an element lithium to an element cobalt in the positive electrode active material is A, and when the lithium-ion battery is in an SOC of 100%, a molar ratio of the element lithium to the element cobalt in the positive electrode active material is B, where 0.62?(A?B)?0.655. The lithium-ion battery provided in the present disclosure has good cycling performance at a high voltage.

Abstract: The present application provides a positive electrode piece, a battery and an electric device. A first aspect of the present disclosure provides a positive electrode piece, the positive electrode piece includes a positive electrode current collector and a positive electrode active layer provided on at least one surface of the positive electrode current collector, and the positive electrode active layer includes a positive electrode active material; in a plane composed of a length direction and a thickness direction of the positive electrode piece, particles of the positive electrode active material have a longest distance a in the length direction of the positive electrode piece, and have a longest distance b in the thickness direction of the positive electrode piece, and in a region not less than 25 ?m*25 ?m, the number of the particles of the positive electrode active material meeting a/b?3 is N, where N?2.

Abstract: The present disclosure provides a positive electrode material, a battery and an electric device. A first aspect of the present disclosure provides a positive electrode material, the positive electrode material is Lin-xNaxCo1-yMeyO2, 0.7?n?1, 0<x?0.15, 0?y?0.15, and Me is selected from one or more of Al, Mg, Ti, Zr, Ni, Mn, Y, La, Sr, W, Sc, Ce, P, Nb, V, Ta, and Te; a X-ray diffraction pattern of the positive electrode material includes a peak 002 corresponding to a crystal plane 002, a peak 004 corresponding to a crystal plane 004, a peak 101 corresponding to a crystal plane 101, a peak 102 corresponding to a crystal plane 102, and a peak 103 corresponding to a crystal plane 103; a peak intensity ratio of the peak 101 to the peak 004 is m, wherein m?1.5.