Abstract: The present application provides a carbonaceous material and a preparation method therefor, and a secondary battery and an electrical device comprising the same. The carbonaceous material has 0.13?A/B?0.50, wherein A represents a mass of water vapor adsorbed on the carbonaceous material after a water vapor adsorption test by placing the carbonaceous material under constant temperature and humidity conditions of 25° C. and 100% RH for 100 h, and B represents an initial mass of the carbonaceous material. The present application can simultaneously improve the capacity and initial coulombic efficiency of the carbonaceous material.

Abstract: A carbonaceous material contains element O, where the content of element O of the carbonaceous material tested by X-ray photoelectron spectroscopy is denoted as A, the content of element O of the carbonaceous material tested by elemental analysis is denoted as B, and the carbonaceous material satisfies A/B?3 and 5 wt %?A?20 wt %.

Abstract: A carbonaceous material where in the CO2 adsorption test of the carbonaceous material, the total CO2 adsorption at 0° C. and a relative pressure P/P0 between 10?8 and 0.029 is recorded as A, the adsorption time is recorded as B, and the carbonaceous material satisfies: A/B?1.7 cm3/(g×h) STP, where STP is the standard condition, P represents the test pressure of CO2, and P0 represents the saturated vapor pressure of CO2 at 0° C.

Abstract: A carbonaceous material has an adsorption velocity v that satisfies 0.015?v?0.050 when subjected to an adsorption test using water vapor at a constant temperature and humidity of 25° C. and 40% RH. The water vapor adsorption test is performed under the following conditions: in a constant temperature and humidity chamber at 25° C. and 40% RH, the carbonaceous material with a mass of m1 is placed in a container, and a water vapor adsorption mass m2 and a water vapor adsorption time t are recorded when the water vapor adsorption of the carbonaceous material reaches equilibrium, and the water vapor adsorption velocity is v=m2/(m1×t), where mi is measured in g, m2 is measured in g, and t is measured in h.

Abstract: The present application provides a positive electrode active material which may be in a particulate form and comprise a compound represented by Formula 1: NaxAyM1[M2(CN)6]?·zH2O??Formula 1 wherein, A is selected from at least one of an alkali metal element and an alkaline earth metal element, and the ionic radius of A is greater than the ionic radius of sodium; M1 and M2 are each independently selected from at least one of a transition metal element, 0<y?0.2, 0<x+y?2, 0<??1, and 0?z?10; and the particles of the positive electrode active material may have a gradient layer in which the content of the A element decreases from the particle surface to the particle interior.

Abstract: An electrode active material includes a layered metal oxide. The layered metal oxide has the following general formula: NaxM1aM2bMn1-a-bO2-zFz; where 0.55?x?0.85, a?0, b?0, 0.1?a+b?0.33, and 0.06?z/(1?a?b)?0.13; M1 is selected from one or more of alkali metal elements other than Na and alkaline earth metal elements; and M2 is selected from one or more of transition metal elements other than Mn.

Abstract: The present application provides a positive electrode active material and the preparation thereof, a secondary battery, a battery module, a battery pack, and electrical device. The positive electrode active material of the present application comprises a layered sodium composite oxide containing antimony having a chemical formula of Formula I, NaxMnaFebNicSbdLeO2 (I), in which 0.7<x?1, 0<a, 0?b, 0.1<c?0.3, 0<d?0.1, 0?e, a+b+c+d+e=1, (b+c)/(a+d+e)?1, and L is one or more selected from Cu, Li, Ti, Zr, K, Nb, Mg, Ca, Mo, Zn, Cr, W, Bi, Sn, Ge, Al, Si, La, Ta, P, and B. The layered sodium composite oxide containing antimony of the present application, by being doped with specific metal Sb, has high stability to water.

Abstract: An electrode active material is provided. The electrode active material includes a layered metal oxide having a general formula NaxZnaNibMncM1dO2M2e, where 0.6?x?0.85, 0.95?a+b+c+d?1.05, 0?d?0.05, and 0?e?0.067, and where 0.04?a/c?0.1 and 0.23?b/c?0.45. M1 is selected from at least one of alkaline earth metal elements, transition metal elements, and alkali metal elements other than Zn, Ni, and Mn, and M2 is selected from non-metallic elements other than O.

Abstract: A positive electrode active material is granular and comprises a compound represented by formula 1: (NaxAy)a?bM1[M2(CN)6]?, wherein A is selected from at least one of alkali metal elements and has an ionic radius greater than that of sodium, M1 and M2 are each independently selected from at least one of transition metal elements, 0<y?0.2, 0<x+y?2, 0???1, a+b=2, 0.85?a?0.98, (represents a vacancy, and b represents the number of vacancies; and when the positive electrode active material is dissolved, at a temperature of 20° C., into an aqueous solution having a concentration of 5 g/100 g water, a pH value of the aqueous solution is in a range of 7.6 to 8.5. The positive electrode active material has good cycling and rate performance, and a high specific capacity.

Abstract: The present application provides a positive electrode active material which may be in a particulate form and comprise a compound represented by Formula 1: NaxAyM1[M2(CN)6]?·zH2O??Formula 1 wherein, A is selected from at least one of an alkali metal element and an alkaline earth metal element, and the ionic radius of A is greater than the ionic radius of sodium; M1 and M2 are each independently selected from at least one of a transition metal element, 0<y?0.2, 0<x+y?2, 0<??1, and 0?z?10; and the particles of the positive electrode active material may have a gradient layer in which the content of the A element decreases from the particle surface to the particle interior.

Abstract: Provided are a layered oxide and a preparation method thereof, a positive electrode sheet, a secondary battery, a battery module, a battery pack and an electrical apparatus. The layered oxide includes an oxide with the general formula NaxMnyAaQbCcO2, where A is one or two of Fe and Ni; Q is one or more of transition metal elements containing 3d or 4d orbital electrons except Fe and Ni; C is one or two of Al and B, 0.66<x?1, 0.2?y?0.6, 0.3?a?0.6, 0<b?0.2, 0<c?0.1, and 1?b/c?100. The A element undergoes valence changes to provide charge compensation in a charge and discharge process, thereby improving the specific capacity of the layered oxide; the Q element and oxygen form a hybrid orbital, inhibiting irreversible oxygen losses and structure collapse of oxygen under a high voltage; the C element has a high ionic potential so as to effectively inhibit oxygen losses; and 1?b/c?100.

Abstract: This application relates to a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes: a negative electrode plate including a negative electrode current collector and a negative electrode film layer disposed on the negative electrode current collector, the negative electrode film layer containing a carbon material; a positive electrode plate including a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, the positive electrode active material layer containing a sodium-ion active material; and an electrolyte disposed between the negative electrode plate and the positive electrode plate, the electrolyte containing sodium salt and lithium salt.

Abstract: Provided are a positive active material for use in a sodium-ion battery, a method for preparing same, a positive electrode plate containing same, a sodium-ion battery, and an electrical device. The method for preparing a positive active material for use in a sodium-ion battery includes the following steps: mixing a positive active material for use in a sodium-ion battery with, and causing the positive active material to react with, a washing solution at a temperature of T1, and filtering and drying a product of the reaction to obtain a washed positive active material for use in a sodium-ion battery, where the washing solution is deionized water or an acidic solution with a pH value lower than 7.0, and 0° C.?T1<20° C.

Abstract: Embodiments of the present application provide a Prussian blue-like transition metal cyanide, a preparation method therefor, and related positive electrode plate, secondary battery, battery pack and device. The Prussian blue-like transition metal cyanide may comprise secondary particles which comprise a plurality of primary particles, wherein the primary particles may have a spherical or spherical-like morphology.

Abstract: An electrode plate, a secondary battery and a preparation method therefor, and a device comprising the secondary battery are provided. In some embodiments, the electrode plate comprises a current collector and an active material layer provided on at least one surface of the current collector, wherein the active material layer comprises an active material and a solid water-fixing agent capable of fixing water.

Abstract: The present disclosure relates to a positive electrode active material for a sodium ion battery, a sodium ion battery made from the same, a battery module, a battery pack and an apparatus. Specifically, the positive electrode active material for a sodium ion battery mainly includes an O3-phase layered metal oxide having the following molecular formula: NaaMbNicFedMneO2±? (Formula I), in which M is a metal cation different from Ni, Fe and Mn; 0.67<a<1.1; 0<b<0.25, optionally 0.05<b<0.15; 0<c<0.3, optionally 0.05<c<0.25; 0<b+c<0.55, 0.45<d+e<1, and b+c+d+e=1; and 0???0.1, wherein the metal cation is at least one selected from Li+, Cu2+, Zn2+, Co2+ and Ti4+.

Abstract: The present application relates to a positive electrode material for a sodium-ion battery and a preparation method thereof, and a sodium-ion battery, a battery module, a battery pack and an apparatus manufactured from the active material, the positive electrode material for the sodium-ion battery comprises a composite of sodium halophosphate with carbon having the following molecular formula: Na2M1hM2k(PO4)X/C, in which M1 and M2 are transition metal ions each independently selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Sr, Y, Nb, Mo, Sn, Ba and W; h is from 0 to 1, k is from 0 to 1, and h+k=1; X is halogen ion selected from F, Cl and Br, wherein the positive electrode material has a powder resistivity in the range of from 10 ?·cm to 5,000 ?·cm under a pressure of 12 MPa.

Abstract: This application relates to a sodium-ion battery, a positive electrode plate for a sodium-ion battery, a battery module, a battery pack, and a device. The sodium-ion battery according to this application includes a positive electrode plate, a negative electrode plate, a separator, and an electrolytic solution. The positive electrode plate includes a positive active material. A molecular formula of the positive active material satisfies NaaLibM0.7Fe0.3?bO2±?, M is a transition metal ion, 0.67<a<1.1, 0<b<0.3, 0???0.1, and a ratio of Rct to Rf of the positive active material satisfies 1.0<Rct/Rf<20.0. Rct is a charge transfer resistance of the positive active material measured in a button battery based on alternating current impedance spectroscopy, and Rf is a diffusion resistance of the positive active material measured in the button battery based on the alternating current impedance spectroscopy.

Abstract: The present application discloses a positive electrode active material satisfying the chemical formula LxNayMzCu?Fe?Mn?O2+??0.5?X? and a preparation method therefor, a sodium ion battery and an apparatus including such battery, wherein L is a doping element at alkali metal site, M is a doping element at transition metal site, and X is a doping element at oxygen site, 0?x<0.35, 0.65?y?1, 0<??0.3, 0<??0.5, 0<??0.5, ?0.03???0.03, 0???0.1, z+?+?+?=1, mx+y+nz+2?+3?+4?=2(2+?), m is the valence state of L, and n is the valence state of M; and the pH of the positive electrode active material is 10.5-13, wherein L is a doping element at alkali metal site, M is a doping element at transition metal site, and X is a doping element at oxygen site.

Abstract: A positive electrode active material and a preparation process thereof, a sodium ion battery (5) and an apparatus containing the sodium ion battery (5) are described, the positive electrode active material satisfying the chemical formula of Na0.67MnxAyBzO2±?, in which A is selected from one or more of Co, Ni and Cr, B is selected from one or more of Mg, Al, Ca, Ti, Cu, Zn and Ba, 0.6<x<1, 0<y<0.1, 0.6<x+y<0.8, z>0, x+y+z=1, 0???0.1, and (I) 3 . 3 ? 3 + 2 ? ( ? - y - z ) 4 < x < 3 . 3 ? 3 + 2 ? ( ? - y - z ) 3 .