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.

Abstract: This application relates to a sodium-ion battery and an electric apparatus containing the same. The sodium-ion battery includes a positive electrode plate, a separator, and a negative electrode current collector. The separator is disposed between the positive electrode plate and the negative electrode current collector. A coating is provided on a surface of the negative electrode current collector, the coating includes a carbon material, and the carbon material includes carbon nanotubes. The sodium-ion battery can effectively enhance the suppression of sodium dendrites and improve the cycling performance. In addition, it is unnecessary to additionally provide a negative electrode active material layer, reducing the costs of the sodium-ion battery and improving the energy density of the sodium-ion battery.

Abstract: This application provides an electrolyte, a sodium-ion battery, a battery module, a battery pack, and an electric apparatus. The electrolyte includes a sodium salt and an organic solvent. The organic solvent includes a fluorinated organic substance, an ether organic substance, and a coordinating organic substance, where the coordinating organic substance includes a plurality of functional groups capable of coordinating with transition metal. The electrolyte provided in this application can improve cycling performance of sodium-ion batteries in high-temperature environments.

Abstract: The present application provides an electrolyte solution for a sodium-ion battery, comprising a sodium salt of formula NaBOaFxRy?z, a fluoroalkyl ether, and other ethers except for the fluoroalkyl ether, wherein a, x, y, and z are as defined in the specification. The electrolyte solution according to the present application has good stability, particularly oxidation resistance and good solvability of sodium ions, thus broadening an electrochemical window of a corresponding sodium-ion battery, enhancing coulombic efficiency, and improving cycling performance and safety performance. The present application further provides a secondary battery, a battery module, a battery pack, and an electrical apparatus using the electrolyte solution for a sodium-ion battery.

Abstract: This application provides a sodium-ion battery electrolytic solution. The electrolytic solution includes an ether compound as a solvent, a sodium borate compound as a sodium salt, and a borate ester compound as an additive, and a percentage of the ether compound in a total solvent of the electrolytic solution is 50 wt % or above. The electrolytic solution can inhibit battery volume expansion and sodium dendrite growing. This application further provides a sodium-ion battery including the electrolytic solution, a battery module, a battery pack, and an electrical device.

Abstract: Provided are a positive electrode material composition, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode material composition comprises a positive electrode active material with a core-shell structure and an organopolysiloxane compound, wherein said core comprises Li1+xMn1-yAyP1-zRzO4; and said shell comprises a first cladding layer covering said core and a second cladding layer covering said first cladding layer. The positive electrode material composition of the present application enables the secondary battery to have a higher energy density, while having improved cycle performance, safety performance and/or rate performance.

Abstract: Provided are a positive electrode active material, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode active material has a core-shell structure, comprising a core and a shell cladding the core, wherein the core has a chemical formula of Li1+xMn1-yAyP1-zRzO4, the shell comprises a first cladding layer cladding the core, a second cladding layer cladding the first cladding layer, a third cladding layer cladding the second cladding layer and a fourth cladding layer cladding the third cladding layer. The positive electrode active material of the present application enables the secondary battery to have a relatively high energy density, and good cycling performance, rate performance and safety performance.

Abstract: The present application provide a silicon-oxygen compound, a preparation method thereof and related secondary battery, battery module, battery pack, and device. 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 manganese element, and the sulfur element is present in an amount of 20 ppm˜300 ppm. The mass ratio of sulfur element to manganese element is from 1.5 to 10.

Abstract: This application discloses a negative current collector, a negative electrode plate, an electrochemical apparatus, a battery module, a battery pack, and a device. The negative current collector includes a support layer and a metal conductive layer that is disposed on at least one of two opposite surfaces of the support layer in a thickness direction of the support layer. A density of the support layer is less than a density of the metal conductive layer; and the density of the metal conductive layer is 8.0 g/cm3 to 8.96 g/cm3. A thickness D1 of the metal conductive layer is 300 nm?D1?2 ?m. When a tensile strain of the negative current collector is 2.5%, a sheet resistance growth rate T of the metal conductive layer is T?5%.

Abstract: The present invention relates to an electrode active material, a preparation method thereof, an electrode, a battery, and an apparatus. The electrode active material includes: a core and a coating layer, where the core includes a ternary material, the coating layer coats the core, the coating layer includes a reaction product of a sulfur-containing compound and a lithium-containing compound, and the reaction product includes element Li, element S, and element O.

Abstract: The present application discloses a composite graphite material and a method for preparing the same, a secondary battery, and an apparatus. The composite graphite material includes a core material and a coating layer that coats at least a portion of the surface of the core material, the core material including graphite, and the coating layer including a coating material containing a cyclic structure moiety, wherein the composite graphite material has a weight-loss rate of from 0.1% to 0.55% when the composite graphite material is heated in an atmosphere of an inert non-oxidative gas at a temperature rising from 40° C. to 800° C. The composite graphite material can enhance the gram capability and reduce the expansion rate of an electrode plate, and more preferably, can improve the cycle performance and kinetic performance of a battery as well.

Abstract: Provided is a secondary battery including a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a positive current collector and a positive active material layer arranged on the positive current collector, and the positive active material layer contains a sodium ion active material. The negative electrode plate includes a negative current collector and a metal film layer arranged on at least one surface of the negative current collector. A nucleation overpotential of sodium on the negative electrode plate is smaller than or equal to 35 mV. The electrolyte is arranged between the positive electrode plate and the negative electrode plate, and the electrolyte contains a sodium borate.

Abstract: Provided is a secondary battery including a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a positive current collector and a positive active material layer arranged on the positive current collector, and the positive active material layer contains a sodium ion active material. The negative electrode plate includes a negative current collector and a negative film layer arranged on at least one surface of the negative current collector, and the negative film layer contains a carbon material. The electrolyte is arranged between the positive electrode plate and the negative electrode plate, and the electrolyte contains a sodium borate.

Abstract: This application provides a composite current collector for positive electrode including a support layer and a conductive layer disposed on at least one side of the support layer. The support layer is an organic support layer. The support layer has a thickness d1, a tensile strength at break T1, a yield strength Q1, and an elastic modulus G1; the conductive layer has a total thickness d2, a tensile strength at break T2, and an elastic modulus G2; and the composite current collector for positive electrode satisfies the following condition: (d1×T1?(d2×T2)×(1??)?d1×Q1×?)?800 Pa·m, where ?=G1/(G1+G2).

Abstract: Provided are a positive electrode material composition, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode material composition comprises a positive electrode active material with a core-shell structure and an organopolysiloxane compound, wherein the positive electrode active material comprises a core and a shell covering the core, wherein the core has a chemical formula of Li1+xMn1?yAyP1?zRzO4, and the shell comprises a first cladding layer covering the core, a second cladding layer covering the first cladding layer, and a third cladding layer covering the second cladding layer. The positive electrode material composition of the present application enables the secondary battery to have a relatively high energy density, while further improving cycling performance safety performance and/or rate performance of the secondary battery.

Abstract: The present application provides a positive electrode material composition, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode material composition includes a positive electrode active material and an organopolysiloxane compound, wherein said positive electrode active material has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn. The positive electrode material composition of the present application enables the secondary battery to have a relatively high energy density, while further improving rate performance, cycling performance and/or high-temperature stability of the secondary battery.

Abstract: The present application discloses a negative electrode plate, an electrode assembly, a lithium-ion battery and process for the preparation thereof, and apparatus containing lithium-ion battery. The negative electrode plate includes a negative electrode current collector; a negative electrode active material layer disposed on the negative electrode current collector; a binder-free inorganic dielectric layer disposed on one side of the negative electrode active material layer away from the negative electrode current collector, the inorganic dielectric layer comprising an inorganic dielectric material, and the inorganic dielectric layer including at least a main body portion disposed on the surface of the negative electrode active material layer, the main body portion having a thickness of from 30 nm to 1000 nm; and a lithium metal layer disposed on the surface of the inorganic dielectric layer away from the negative electrode active material layer.

Abstract: A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application may comprise: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.

Abstract: Provided are a positive electrode active material, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode active material has a core-shell structure, including a core and a shell cladding the core, wherein the core includes Li1+xMn1?yAyP1?zRzO4, the shell includes a first cladding layer cladding the core, a second cladding layer cladding the first cladding layer and a third cladding layer cladding the second cladding layer. The positive electrode active material of the present application enables the secondary battery to have a relatively high energy density, and good rate performance, cycling performance and safety performance.

Abstract: The present disclosure relates to the technical field of energy storage, and in particular, relates to a positive electrode, a method for preparing the positive electrode and an electrochemical device. The positive electrode includes a current collector and a positive electrode active material layer that contains positive electrode active material and is arranged on at least one surface of the current collector. An inorganic layer having a thickness of 20 nm to 2000 nm is arranged on the surface of the at least one positive electrode active material layer away from the current collector. The inorganic layer is a porous dielectric layer containing no binder, and the inorganic layer has a porosity of 10%˜60%. The positive electrode active material layer according to the present disclosure significantly improves the cycle performance, high-temperature storage performance and safety of the electrochemical device.