Abstract: A positive electrode active material and a method for preparing the same, a positive electrode plate, a battery and an electrical apparatus. The positive electrode active material includes Na4-xKyFe3-pMq(PO4)2P2O7, where M includes at least one of Ni, Co, Mn, V, Ti, Mo, Nb, W, Cr, Zn, Zr, Ca, Mg, Cu, Sr, Y or Al, with 0<x?0.4, 0<y?0.4, 0<p?0.3, and 0<q?0.3.

Abstract: A positive electrode active composite material, a preparation method therefor, a positive electrode plate, a secondary battery, and a power consuming apparatus are disclosed. The positive electrode active composite material includes a carbon material, a transition metal M and a polyanionic compound. The positive electrode active composite material has a good degree of graphitization and good processability, and the compaction density of the positive electrode active composite material and the compaction density of a positive electrode film layer are increased, improving the performance of batteries.

Abstract: A positive electrode active material, a method for preparing a positive electrode active material, a positive electrode plate, a battery, and a power consuming apparatus. The positive electrode active material includes a core and a first coating layer. The core includes NaxRy(PO4)z(P2O7)k. 1?x?7. 1?y?4. 1?z?4. 1?k?4. R includes at least one of Mg, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, or Pb. The first coating layer is formed on at least a part of the core. The first coating layer includes MaOb. M includes at least one of Ca, Bi, Ba, Ti, Al, Nb, Mg, Fe, Cu, Zn, Mn, Ni, or Co. 1?a?7. 1?b?12.

Abstract: An electrode plate, a preparation method thereof, a battery, and an electric apparatus, where the electrode plate includes a current collector and an electrode film layer disposed on a surface of the current collector. A composition of the electrode film layer includes a silicon compound, and the silicon compound has a group represented by formula (A); where each R1 is independently selected from any one of hydrogen, a substituted or unsubstituted alkyl group, an alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and an unsaturated hydrocarbon group. Not all R1 groups are hydrogen; and “*” represents a site where the group represented by formula (A) is connected to another structure in the silicon compound.

Abstract: A composite separator, a secondary battery, and a power consuming apparatus. The composite separator includes a separator substrate and a conductive coating disposed on a side of the separator substrate. The conductive coating in the composite separator is conducive to improving the current density for deposition of metal ions on a negative electrode current collector such that the metal ions are evenly deposited, and is also conducive to reducing an overpotential of a battery including same such that metal dendrites are further alleviated.

Abstract: A positive electrode active material, a preparation method thereof, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus are provided. The positive electrode active material includes: a polyanion compound, where the polyanion compound has the following general formula: NaxRy(PO4)z(P2O7)k, where R includes at least one of Mg, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, and Pb, 1?x?7, 1?y?4, 1?z?2, and 1?k?4; and a first carbon material and a second carbon material compounded with the polyanion compound, where a crystallinity of the first carbon material is higher than that of the second carbon material.

Abstract: A positive electrode active material and a preparation method therefor, as well as a positive electrode plate, a secondary battery, and a power-consuming apparatus, are disclosed. The positive electrode active material is a polyanionic compound/carbon composite and has the general formula: Na4-xR3-?M(PO4)2P2O7/C, where R includes at least one of Mg, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, and Pb; M includes at least one of Mg, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, Si, W, and Pb; 0?x?0.5, 0?y?0.5, 0?z<x+y, and x and y are not both zero. The composite structure enables enhanced electrochemical performance and structural stability in sodium-based secondary batteries.

Abstract: The present application provides an electrolyte, a secondary battery and an electrical apparatus. The electrolyte contains a sodium salt and metal ions having ionic radii greater than that of a sodium ion. The electrolyte can effectively inhibit sodium dendrites, helping to improve the cycle performance and the high-temperature storage performance of batteries.

Abstract: An electrolyte for a sodium metal battery is disclosed. The electrolyte includes a non-aqueous solvent and a sodium salt. The non-aqueous solvent comprises an ether solvent that includes ethylene glycol dimethyl ether and one or more compounds represented by a general formula: R1—(O—R3)n—O—R2, where R1 and R2 are independently selected from C1-C6 alkyl groups, R3 is selected from a C1-C5 alkylene group, and n is an integer from 2 to 5; or R1 and R2 are selected from C2-C6 alkyl groups, R3 is a C1-C5 alkylene group, and n is 1. The mass percentage of ethylene glycol dimethyl ether ranges from 5% to 50%. The electrolyte improves the cycle performance of the sodium metal battery, particularly under low-temperature conditions.

Abstract: Provided in the present application are a positive electrode active material and a preparation method therefor, a secondary battery, a battery module, a battery pack and an electric device. The positive electrode active material is used as a positive electrode active material for a secondary battery and comprises a carbon-material-compounded iron-based polyanionic compound and a magnesium-containing oxide, wherein the iron-based polyanionic compound has the following general formula: Na4Fe3-xMxMgy(PO4)2P2O7, where M comprises a transition metal element, 0?x?0.5, and 0<y<0.18. The positive electrode active material has a relatively low amount of a residual alkali, and the battery has good cycle performance and rate capability.

Abstract: A positive electrode active material, a secondary battery, a battery module, a battery pack, and an electric device. The positive electrode active material is used as a positive electrode active material for a secondary battery, and comprises a carbon material compounded iron-based polyanionic compound and an aluminum-containing oxide, and the iron-based polyanionic compound has the following general formula: Na4Fe3?xMxAly(PO4)2P2O7/C, wherein M comprises a transition metal element, 0?x?0.5, and y is greater than 0 and less than 0.2. The positive electrode active material has relatively low residual alkali amount, and the battery has excellent cycle performance and rate capability.

Abstract: A computer-implemented method for suppressing fat in reconstructed magnetic resonance imaging data includes generating, via a processor, a first echo image and a second echo image from magnetic resonance scan data acquired of a subject with a magnetic resonance scanner utilizing a multi-echo steady state sequence. The computer-implemented method also includes estimating, via the processor, an echo phase difference between the first echo image and the second echo image to generate an echo phase difference image. The computer-implemented method further includes identifying, via the processor, voxels in the echo phase difference image having an extra chemical shift phase. The computer-implemented method even further includes removing, via the processor, signals of the voxels identified having the extra chemical shift phase in both the first echo image and the second echo image to generate a first fat-removed image and a second fat-removed image, respectively.

Abstract: A positive electrode active material and a preparation method therefor, a secondary battery and an electrical device. The positive electrode active material comprises a polyanionic compound having a general formula as shown in formula I. The positive electrode active material has a crystallinity of 0.8-1. Formula I: NaxFey1My2(PO4)z(P2O7)k, wherein M comprises at least one of Mg, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W and Pb, 1?x?7, 1?y1+y2?4, 1?z?2, and 1?k?4. The positive electrode active material has relatively high crystallinity and is beneficial for improving the initial discharge capacity of a battery.

Abstract: The present disclosure provides a negative electrode active material, a battery and a device. The negative electrode active material comprises a first silicon oxide and a second silicon oxide, wherein, a ratio of a particle diameter Dn10 of the first silicon oxide to a particle diameter Dn10 of the second silicon oxide is 8˜25, the particle diameter Dn10 of the first silicon oxide is 1.0 ?m˜5.0 ?m, the particle diameter Dn10 of the second silicon oxide is 0.05 ?m˜0.50 ?m. By selecting two kinds of silicon oxides with specific ranges of Dn10 to match with each other, the present disclosure controls the thickness rebound of negative electrode plate, ensures good electrical contact between the negative electrode active material particles, in turn is beneficial to improve the cycle stability and the cycle-life of the battery.

Abstract: The present application provides a silicon carbon negative electrode material, a negative electrode sheet including the same, a secondary battery, a battery module, a battery pack and a power consumption apparatus. A battery composed of a negative electrode prepared by the silicon carbon negative electrode material in the present application as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance may be charged and discharged, and in a case of drawing a relationship graph between a differential value dQ/dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ/dV between 400-480 mV to a maximum X of dQ/dV between 200-255 mV may be in a range of 3.5 to 15.

Abstract: This application provides a positive active material. The positive active material is a composite of NaxRy(PO4)z(P2O7)k and C, where 1?x?7, 1?y?4, 1?z?2, 1?k?4, and R includes at least one of Mg, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Hf, Ta, W, or Pb; and a water content of the positive active material is not higher than 1600 ppm. This application further provides a method for preparing the positive active material, a positive electrode plate containing the material, a secondary battery, and an electrical device. The positive active material of this application contains a relatively low water content.

Abstract: The present application provide a silicon-oxygen compound, a secondary battery using it, and related battery modules, battery packs, and devices. The silicon-oxygen compound provided by the present application has a formula of SiOx, in which x satisfies 0<x<2. The silicon-oxygen compound contains both sulfur and aluminum element, and the sulfur element is present in an amount of 20 ppm˜300 ppm. The mass ratio of sulfur element to aluminum element is from 1.5 to 13.0. A secondary battery uses the silicon-oxygen compound provided in the present application, so that the secondary battery can have both long-cycle performance and high initial coulombic efficiency.

Abstract: This application provides a secondary battery, a battery module, a battery pack, and an electrical device. The secondary battery includes a positive electrode plate and an electrolyte solution. The electrolyte solution contains a film-forming additive. A film resistance x? of the positive electrode plate and a mass percent y % of the film-forming additive based on a total mass of the electrolyte solution satisfy: x×y?25. The film resistance and the film-forming additive of the secondary battery provided in this application satisfy the above relationship. Regulating the film resistance and the film-forming additive of the secondary battery as disclosed enhances the Coulombic efficiency, high-temperature cycle performance, and high-temperature storage performance of the battery.

Abstract: The present application discloses a silicon-oxygen compound, a method for preparation thereof, and a secondary battery, a battery module, a battery pack and an apparatus related thereto. The silicon-oxygen compound includes both manganese element and a copper element, a content of the manganese element is from 20 ppm to 500 ppm, and a mass ratio of the manganese element to the copper element is from 1 to 18.

Abstract: The present application relates to a sodium-ion battery and an electrical apparatus including the same. The sodium-ion battery includes a positive electrode sheet, a separator, and a negative electrode current collector, wherein the separator is disposed between the positive electrode sheet and the negative electrode current collector, a surface of the negative electrode current collector is provided with a protective layer capable of allowing sodium-ions to pass freely, a material of the protective layer mainly includes a polymer material, there is an accommodation area between the protective layer and the negative electrode current collector, and the accommodation area has a sodium metal layer formed on the surface of the negative electrode current collector. The sodium-ion battery can effectively improve the inhibition of sodium dendrites, reduce side reactions between sodium metal and an electrolyte solution, and improve the cycle performance of the sodium-ion battery.