Abstract: A secondary battery includes a negative electrode plate including a negative electrode current collector and a negative electrode film layer having a first surface distal to the negative electrode current collector and a second surface opposite to the first surface. A first region extending from the second surface to a thickness range of 0.3 H(H being a thickness of the negative electrode film layer) includes a first negative electrode active material including a first carbon-based material. A second region extending from the first surface to the thickness range of 0.3 H includes a second negative electrode active material including a second carbon-based material. The first carbon-based material includes natural graphite. A total pore area of an internal region of the second carbon-based material is greater than a total pore area of an external region of the second carbon-based material.

Abstract: A secondary battery includes a negative electrode plate, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer 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 first carbon-based material and a second carbon-based material. The first carbon-based material has a pore structure, and the total pore area S2 of an internal region of the first carbon-based material is larger than the total pore area S1 of an external region of the first carbon-based material; and the second carbon-based material satisfies ID/IG?0.140.

Abstract: A secondary battery includes a negative electrode plate including a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector and including a negative electrode active material that includes a first carbon-based material and a second carbon-based material. The first carbon-based material includes an external region and an internal region located at an inner side of the external region. The external region extends from a surface of a particle of the first carbon-based material to an interior of the particle by a distance of 2.5 ?m. In a cross-sectional view of the first carbon-based material, a total pore area of the external region is smaller than a total pore area of the internal region. A degree of graphitization of the first carbon-based material is greater than a degree of graphitization of the second carbon-based material.

Abstract: A secondary battery includes a negative electrode plate; the negative electrode plate includes a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector and including a negative electrode active material; the negative electrode active material includes a first carbon-based material and a second carbon-based material; the first carbon-based material includes artificial graphite in the form of secondary particles; the second carbon-based material includes an external region and an internal region located on the inner side of the external region; and the external region refers to a region formed by extending from the surface of a particle of the second carbon-based material to the interior of the particle by a distance of 2.5 ?m.

Abstract: A secondary battery includes a negative electrode plate, and the negative electrode plate includes a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector and including a negative electrode active material, where the negative electrode active material includes a first carbon-based material and a second carbon-based material, the first carbon-based material has a pore structure, ID/IG of the first carbon-based material is less than or equal to 0.280, ID denotes the D peak intensity at 1350±50 cm?1 in the Raman spectrum, and IG denotes the G peak intensity at 1580±50 cm?1 in the Raman spectrum; and the second carbon-based material is an amorphous carbon material.

Abstract: A secondary battery includes negative electrode plate including negative electrode film layer having first surface and second surface opposite to each other. First region of the negative electrode film layer extending from the second surface to thickness range of 0.3H includes first active material including first carbon-based material. Second region of the negative electrode film layer extending from the first surface to thickness range of 0.3H includes second active material including second carbon-based material that includes amorphous carbon material. The first carbon-based material includes external region and internal region inside the external region. The external region extends from surface of particle of the first carbon-based material to interior of the particle by distance of 2.5 ?m. In cross-sectional view of the first carbon-based material, total pore area of the external region is smaller than total pore area of the internal region.

Abstract: A secondary battery includes a negative electrode sheet, where the negative electrode sheet includes a negative electrode current collector and a negative electrode film layer arranged on at least one surface of the negative electrode current collector, the negative electrode film layer includes a negative electrode active material, a compaction density of the negative electrode film layer is greater than or equal to 1.45 g/cm3, a liquid absorption rate of the negative electrode active material is 30 ml/100 g to 60 ml/100 g, and a tortuosity of the negative electrode sheet is less than or equal to 6.

Abstract: A secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, wherein the negative electrode film layer is provided with a first surface away from the negative electrode current collector and a second surface opposite to the first surface, and the thickness of the negative electrode film layer is denoted as H; a region within a thickness range from the first surface of the negative electrode film layer to 0.3H is denoted as a first region, the first region includes a first negative electrode active material, and the first negative electrode active material includes a first carbon-based material; and the first carbon-based material satisfies that a total pore area of an external region is less than a total pore area of an internal region.

Abstract: Provided are secondary battery and an electric device. The secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer on at least one surface of the negative electrode current collector. The negative electrode film layer includes a negative electrode active material. The negative electrode active material includes a first carbon-based material and a second carbon-based material, and both the first carbon-based material and the second carbon-based material are provided with pore structures. The ID/IG of the first carbon-based material is ?0.27, and the ID/IG of the second carbon-based material is ?0.38, where the ID denotes the D peak intensity at 1350±50 cm?1 in a Raman spectrum, and the IG denotes the G peak intensity at 1580±50 cm?1 in a Raman spectrum.

Abstract: The present disclosure provides a secondary battery and an electric apparatus. The secondary battery comprises a negative electrode sheet including a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector. The negative electrode film layer includes a first region adjacent to the negative electrode current collector and a second region adjacent to a surface away from the negative electrode current collector. ID/IG of an active material in the second region is greater than ID/IG of an active material in the first region. ID/IG is a ratio of a D peak intensity to a G peak intensity obtained by Raman mapping, where ID represents a D peak intensity at 1350±100 cm1 and IG represents a G peak intensity at 1580±100 cm?1.

Abstract: A secondary battery includes a negative electrode sheet, where the negative electrode sheet includes a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer includes a negative electrode active material and a conductive agent, the negative electrode active material includes a graphite material, and the tap density of the graphite material is greater than or equal to 1.2 g/cm3; and based on the total mass of the negative electrode film layer, the mass percentage of the conductive agent is greater than or equal to 1.6%.

Abstract: A secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer formed on at least one surface of the negative electrode current collector. The negative electrode film layer includes a graphite material. The graphite material has a tap density of 1.2 g/cm3 to 1.4 g/cm3. In addition, a difference between a compaction density of the negative electrode film layer and the tap density of the graphite material is not less than 0.15 g/cm3.

Abstract: An artificial graphite material A. The artificial graphite material A is secondary particles are provided. In some embodiments, a surface roughness ?A of the artificial graphite material A satisfies 6??A?12. This application further provides an artificial graphite material B. The artificial graphite material B is primary particles, where a surface roughness ?B of the artificial graphite material B satisfies 2.5??B?5. This application further provides a secondary battery containing the artificial graphite material A and/or the artificial graphite material B and an electric apparatus. The secondary battery provided by this application can have high energy density and long service life.

Abstract: Disclosed are a composite graphite material, a method for preparing the same, a negative electrode sheet, a secondary battery, a battery module, a battery pack, and an electrical apparatus. The composite graphite material comprises a bulk particle and a cladding layer located on at least a partial surface of the bulk particle, the bulk particle is a secondary particle formed by aggregation of more than two primary particles, the bulk particle comprises artificial graphite, the cladding layer comprises amorphous carbon, and an air oxidation temperature T0 of the composite graphite material is from 630° C. to 730° C. The composite graphite material in the present application can enable the secondary battery to not only have a high energy density, but also have significantly improved fast charging performance and low-temperature power performance.

Abstract: Disclosed are a composite graphite material, a method for preparing the same, a negative electrode sheet, a secondary battery, a battery module, a battery pack, and an electrical apparatus. The composite graphite material comprises a bulk particle and a cladding layer located on at least a partial surface of the bulk particle, the bulk particle is a secondary particle formed by aggregation of more than two primary particles, the bulk particle comprises artificial graphite, the cladding layer comprises amorphous carbon, and an air oxidation temperature T0 of the composite graphite material is from 630° C. to 730° C. The composite graphite material in the present application can enable the secondary battery to not only have a high energy density, but also have significantly improved fast charging performance and low-temperature power performance.

Abstract: A graphite negative electrode active material and a preparation method therefor, a negative electrode plate, a secondary battery, and an electrical apparatus. A particle body of the graphite negative electrode active material comprises an interior area and a surface layer area at least partially surrounding the interior area, the surface layer area referring to an area formed extending a distance of 30 nm from the surface of the particle body of the graphite negative electrode active material toward the interior, and the surface layer area comprising a disordered layer. The graphite negative electrode active material can balance the kinetic performance and the cycling stability of a battery.

Abstract: The present application provides a carbon material, a method for preparing the same, and a secondary battery and an electrical device comprising the same. The carbon material includes an external region and an internal region disposed on the inside of the external region, the external region being a region formed by extending for a distance of 0.25L from the surface of the particles of the carbon material towards the interior of the particles, L being a short-axis length of the particles of the carbon material; total pore area of the external region being denoted as S1 and total pore area of the internal region being denoted as S2, and S2>S1. The carbon material provided in the present application can make the secondary battery have high initial columbic efficiency, high energy density and good cycling performance.

Abstract: Disclosed are a composite graphite material, a method for preparing the same, a negative electrode sheet, a secondary battery, a battery module, a battery pack, and an electrical apparatus. The composite graphite material comprises a bulk particle and a cladding layer located on at least a partial surface of the bulk particle, the bulk particle is a secondary particle formed by aggregation of more than two primary particles, the bulk particle comprises artificial graphite, the cladding layer comprises amorphous carbon, and an air oxidation temperature T0 of the composite graphite material is from 630° C. to 730° C. The composite graphite material in the present application can enable the secondary battery to not only have a high energy density, but also have significantly improved fast charging performance and low-temperature power performance.

Abstract: The present application discloses a secondary battery comprising a negative electrode plate, an apparatus including the secondary battery, an artificial graphite and a preparation method thereof, the negative electrode plate comprising a negative active material, wherein the negative active material comprises an artificial graphite having a volume average particle size Dv50 of 12 ?m to 22 ?m, and satisfying: 12?Dv50×SSA?25, in which SSA is the specific surface area of artificial graphite, in m2/g; the negative electrode plate has a compaction density of 1.6 g/cm3 to 1.75 g/cm3 and an OI value of at most 15, wherein the OI value represents a ratio C004/C110, in which C004 is the peak area of the diffraction peak of 004 crystal plane of artificial graphite in the negative electrode plate and C110 is the peak area of the diffraction peak of 110 crystal plane of artificial graphite in the negative electrode plate.

Abstract: This application provides a negative electrode active material and a preparation method thereof. The negative electrode active material may be self-embedded graphite composed of graphite A and graphite B, where the surface of the graphite A may have a tenon structure, the surface of the graphite B may have a mortise structure, the tenon structure of the graphite A and the mortise structure of the graphite B may be mutually embedded, and a hydrogen bond may be formed between the tenon structure of the graphite A and the mortise structure of the graphite B.