Abstract: A perovskite solar cell includes a first electrode, a first charge transport layer, a perovskite absorption layer, a second charge transport layer, and a second electrode. The first charge transport layer is arranged on a side of the first electrode; the perovskite absorption layer is arranged on a side of the first charge transport layer away from the first electrode; the second charge transport layer is arranged on a side of the perovskite absorption layer away from the first charge transport layer; and the second electrode is arranged on a side of the second charge transport layer away from the perovskite absorption layer. where the perovskite absorption layer, the second charge transport layer, and the second electrode meet the following relations: d=k?/2n1 and n12=an2×n0.

Abstract: A polymer, a conductive slurry, a positive electrode plate, a secondary battery, and an electric apparatus. The polymer includes a structural unit represented by formula (1) and structural unit(s) represented by formula (2), where in formula (2), R1, R2, and R3 are each independently selected from a hydrogen atom, a halogen atom, or a substituted or unsubstituted C1-C10 alkyl group. The polymer in embodiments of this application exhibits improved dispersion performance.

Abstract: This application proposes a secondary battery and an electric apparatus containing the same. The secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector. The negative electrode film layer includes a negative electrode active material, and the negative electrode active material includes a carbon-based material. In the negative electrode active material, a volume percentage of a first carbon-based material with a particle size less than or equal to 2 ?m is greater than or equal to 15%. The secondary battery has excellent initial coulombic efficiency and cycling performance.

Abstract: Provided are a perovskite betavoltaic-photovoltaic battery. The battery includes a first electrode, a first charge transport layer, a perovskite layer, a second charge transport layer, and a second electrode in sequence. The first electrode is a transparent electrode. The first charge transport layer is an electron transport layer and the second charge transport layer is a hole transport layer, or, the first charge transport layer is a hole transport layer and the second charge transport layer is an electron transport layer. The perovskite layer is doped with a fluorescent substance. At least one of the first electrode, the first charge transport layer, the second charge transport layer, or the second electrode is radioactive. When the first electrode and/or the second electrode is radioactive, the first electrode and/or the second electrode is an irradiated electrode formed by compounding a radioactive source and a conductor material.

Abstract: This application provides a sodium secondary battery electrolyte, a sodium secondary battery, and an electric apparatus. The sodium secondary battery electrolyte is provided, and the electrolyte includes a diluent, where the diluent includes alkane with a formula CnH2n+2, where n is 8 to 13. The diluent can improve high-temperature cycling performance of a battery, reduce high-temperature gas production of the battery, and enhance electrochemical performance and safety performance of the battery at high temperature.

Abstract: This application relates to the technical field of separators, and in particular, to a separator and a preparation method thereof, a coating slurry and a preparation method thereof, an electrode assembly, a battery, and an electrical device. The separator includes a first isolation layer, a coating, and a second isolation layer. The coating is disposed on at least one surface of the first isolation layer. The coating includes a solid electrolyte material. The second isolation layer is disposed on a surface of the coating, the surface being away from the first isolation layer. The solid electrolyte material can react with metallic lithium to absorb lithium dendrites to prevent the lithium dendrites from penetrating the separator.

Abstract: A polymer comprises repeating units represented by formula (I): -M-R-Y- formula (I), wherein in the formula (I), M is selected from substituted or unsubstituted anilino, substituted or unsubstituted carbazolyl, substituted or unsubstituted acridinyl, substituted or unsubstituted phenothiazinyl or substituted or unsubstituted phenoxazinyl; R is selected from substituted or unsubstituted C1-C10 alkyl; and Y is selected from carboxyl or a salt thereof, a phosphoric acid group or a salt thereof, or a sulfonic acid group or a salt thereof.

Abstract: A preparation method includes the following steps: S1, preparing an aqueous solution of a metal salt and an aqueous solution of a precipitant, where the precipitant includes one or more selected from oxalic acid and a water-soluble oxalate; S2, mixing the aqueous solution of the precipitant and the aqueous solution of the metal salt at a shear speed of 10000 r/min or more for co-precipitation reaction; and S3, after the reaction is completed, obtaining the positive electrode active material precursor via washing and drying.

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 method for preparing the ammonium manganese iron phosphate precursor includes mixing and grinding metal source powder and phosphorus source powder to enable a low-heating-temperature solid-state reaction of each component, and then washing and drying the obtained product to obtain the ammonium manganese iron phosphate precursor, where the metal source includes an iron source, a manganese source and an optional source of a doping element M which represents doping elements at manganese and iron sites, and the phosphorus source includes triammonium phosphate.

Abstract: This application provides a secondary battery and an electrical device. The secondary battery includes a current collector and a negative film layer. The negative film layer includes: a first film layer, disposed on at least one surface of the current collector, where the first film layer includes a first negative active material; a second film layer, disposed on a surface of the first film layer, where the surface is away from the current collector, and the second film layer includes a second negative active material. A volume distribution diameter Dv50 of the first negative active material is greater than a volume distribution diameter Dv50 of the second negative active material, and a powder compaction density of the first negative active material is greater than the powder compaction density of the second negative active material under a same pressure.

Abstract: A composite positive electrode active material, a method for preparing the same, and an electric device are described. The method includes: providing positive electrode active material particles; providing a solid aluminum salt to make the solid aluminum salt cover a surface of the positive electrode active material particles; and providing a solid base to the positive electrode active material particles covered by the solid aluminum salt to make the solid aluminum salt and the solid base undergo an in situ solid-phase chemical reaction and generate a cladding layer covering the surface of the positive electrode active material particles, to obtain the composite positive electrode active material, wherein the cladding layer has alumina nanoparticles. The prepared alumina can uniformly cover the surface of the positive electrode active material particles, protect the positive electrode active material, and ensure the electrochemical performance of the positive electrode active material.

Abstract: A separator and a preparation method thereof, a secondary battery, and an electric apparatus are described. The separator includes a first base film and a coating provided on at least one surface of the first base film. The coating includes a thermosensitive functional material. The thermosensitive functional material includes a high-temperature-resistant core layer and a thermosensitive surface layer at least partially enveloping the high-temperature-resistant core layer. The high-temperature-resistant core layer includes one or more of organic polymer fiber and inorganic particle that is surface-modified by a silane coupling agent. This application relates to corresponding preparation method of separator, secondary battery, and electric apparatus. The separator has low pore-closing temperature and high puncture strength, thereby improving the safety performance of the corresponding battery.

Abstract: A fluoropolymer includes a structural unit derived from a monomer of Formula I, a structural unit derived from an olefin monomer, and a structural unit derived from a monomer of Formula II. A molar content of the structural unit derived from the monomer of Formula I is in a range of 60% to 80% based on a total mole of the structural units in the fluoropolymer, wherein R1, R2 and R3 each are independently selected from hydrogen, fluorine, chlorine, or C1-3 alkyl containing at least one fluorine atom, and R4, R5 and R6 each are independently selected from hydrogen, or substituted or unsubstituted C1-5 alkyl.

Abstract: A conductive film includes: a substrate, where the substrate has a first surface and a second surface facing away from each other, and the substrate has a dense structure; and a first porous layer, where the first porous layer is stacked and bonded to the first surface of the substrate; the first porous layer includes a porous conductive material; and the porous conductive material has pores with first pore size and pores with second pore size; the first pore size being n micrometers, where 0.5?n?10; and the second pore size being m nanometers, where 20<m<200.

Abstract: A positive electrode active material, including a boron-doped Prussian blue analog; and the Prussian blue analog has a chemical formula of AaMbM?c(CN)6·dH2O, in which A includes at least one of an alkali metal cation, an alkaline earth metal cation, Zn2+, and Al3+, M and M? each independently includes at least one of Ni ion, Cu ion, Fe ion, Mn ion, Co ion, and Zn ion, and H2O is coordination water, 0<a?2, 0<b?1, 0<c?1, 0?d?2; and relates to a preparation method, a secondary battery, and an electrical device. The stability of the positive electrode active material is improved, and thus improving a cycle performance of the corresponding secondary battery; and the preparation method of the positive electrode active material is simple in operation, mild in reaction conditions, and convenient for industrial application.

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 preparation method of a positive electrode slurry includes a first stirring, a second stirring, a third stirring and a fourth stirring. In the first stirring, a positive electrode active material and a binder are mixed and stirred to prepare a dry mixture. In the second stirring, a binder and a solvent are mixed and stirred to prepare an adhesive solution. In the third stirring, the dry mixture and the adhesive solution are mixed and stirred to prepare a primary slurry. In the fourth stirring, a positive electrode active material, a conductive agent, a solvent and the primary slurry are mixed and stirred to prepare a positive electrode slurry. The binder used in the first stirring is the same as the binder used in the second stirring.

Abstract: A core-shell polymer comprises a core portion and a shell portion that at least partially covers the core portion. The core portion comprises a structural unit derived from a monomer represented by Formula I, and the shell portion comprises a structural unit derived from a monomer represented by Formula I, a structural unit derived from a monomer represented by Formula II, and a structural unit derived from a monomer represented by Formula III, wherein R1, R2 and R3 are each independently selected from hydrogen, fluorine, chlorine or C1-3 alkyl containing at least one fluorine atom, R4, R5, R6, R7, R8, R9 are each independently selected from hydrogen or substituted or unsubstituted C1-3 alkyl, and Ar is substituted or unsubstituted aryl.

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.