Abstract: A secondary battery is provided, including a positive electrode plate and a negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on two surfaces of the positive electrode current collector, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer provided on two surfaces of the negative electrode current collector, and the negative electrode film layer includes a reaction zone opposite the positive electrode film layer and a non-reaction zone not opposite the positive electrode film layer, where a lithium supplement layer and a barrier layer are provided on the non-reaction zone. A preparation method of secondary battery, a battery module, a battery pack, and an electric apparatus are also provided.

Abstract: Provided is a negative electrode plate, comprising: a negative electrode current collector and a first negative electrode active material layer. The first negative electrode active material layer is arranged on at least one surface of the negative electrode current collector, wherein, components of the first negative electrode active material layer comprise, by mass: 30%-70% of a silicon-based material, 15%-40% of a binder and 15%-40% of a conductive agent.

Abstract: A negative electrode active material layer includes a first part and a second part in a thickness direction, and the first part is a part close to a negative electrode current collector is described. During charging of a battery, a lithiation state at the second part is higher, and a lithiation state at the first part is lower. When a mass percentage of a silicon-based material in the first part is greater than a mass percentage of a silicon-based material in the second part, expansion of the silicon-based material in the negative electrode active material layer can be alleviated. Charging and discharging of the battery can be met without full intercalation for the silicon-based material in the first part, and the silicon-based material in the first part does not need to operate at full load.

Abstract: Provided are a battery cell, a battery and an electric device. The battery cell includes a positive electrode plate and a negative electrode plate, the negative electrode plate includes a negative electrode current collector, a negative electrode active material layer arranged on at least one surface of the negative electrode current collector, and a lithium supplement layer, wherein the negative electrode active material layer includes a first portion and a second portion connected with the first portion, the first portion exceeds the positive electrode plate, the second portion is arranged corresponding to the positive electrode plate, and the lithium supplement layer is arranged on at least part of a surface of the first portion away from the negative electrode current collector. The negative electrode plate of the present application can improve the first Coulomb efficiency, cycle performance and storage performance of the battery cell.

Abstract: A silicon-based negative electrode active material. The silicon-based negative electrode active material includes a silicate containing an alkaline earth metal element, and the silicon-based negative electrode active material contains both the element K and the element Mn. A method for preparing the silicon-based negative electrode active material. A secondary battery includes a negative electrode that includes the silicon-based negative electrode active material.

Abstract: This application provides a battery cell, a stacked-type battery, and an electrical device. The battery cell includes at least one electrode assembly. The electrode assembly includes a positive electrode plate and a negative electrode plate. The negative electrode plate includes a first negative electrode plate and a second negative electrode plate. A capacity per unit volume of the first negative electrode plate is greater than a capacity per unit volume of the second negative electrode plate. At least one positive electrode plate is disposed between two adjacent first negative electrode plates, and at least one second negative electrode plate is disposed between the two adjacent first negative electrode plates. The above technical solution alleviates disadvantages caused by expansion of the electrode plate, improves longevity of the battery, and improves an energy density and storage performance of the battery.

Abstract: This application provides a silicon-based negative electrode active material. The silicon-based negative electrode active material includes a silicate containing an alkali metal element. The silicon-based negative electrode active material contains element Mg and element Mn.

Abstract: An artificial graphite and preparation method thereof, negative electrode plates, secondary batteries, battery modules, battery packs, and electrical device are provided. In some embodiments, the artificial graphite has a particle size of Dv5016 ?m and an air oxidation peak temperature Tpeak of 830° C., wherein the air oxidation peak temperature Tpeak of artificial graphite refers to the highest peak temperature of a differential thermo-gravimetric analysis curve obtained when the artificial graphite is subjected to a thermo-gravimetric test having a weighing mass of 10±0.05 mg, with a purging gas of air, an airflow rate of 60 mL/min, and a heating rate of 5° C./min, in a test temperature range of 40° C. to 950° C. By the present application, the resulting secondary batteries have higher first-cycle Coulomb efficiency and longer cycle life under the premise of good fast charging performance.

Abstract: This application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is comprises a first negative electrode active material, and the particle size uniformity of the first negative electrode active material is from 0.4 to 0.6; the second negative electrode film comprises a second negative electrode active material, and the particle size uniformity of the second negative electrode active material is from 0.25 to 0.45, and a ratio of the particle size uniformity of the first negative electrode active material to the particle size uniformity of the second negative electrode active material is from 1.05 to 1.9.

Abstract: The present application provides a negative electrode active material, a method for preparing the same, a secondary battery and an electrical device comprising the same, wherein the negative electrode active material comprises a carbon matrix and a filling material, wherein the carbon matrix has a graphitization degree of less than or equal to 87%, the carbon matrix comprises a plurality of pore structures, at least a portion of the filling material is located in the pore structures of the carbon matrix, and the filling material comprises one or more of elements capable of alloying reaction with Li. The negative electrode active material provided by the present application can have high energy density, high initial coulombic efficiency, low volume expansion, high conductivity and good cycle stability at the same time.

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the same.

Abstract: This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm?0.5×?{square root over (a2+b2)}?15 cm, and a?15 cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.

Abstract: The present application relates to a secondary battery, a battery, and a power consuming device, the secondary battery comprises an electrode assembly, and the electrode assembly comprises: at least one positive electrode sheet and at least one negative electrode sheet, a negative electrode film layer of the at least one negative electrode sheet having a nonreactive region thereon, the nonreactive region being not opposite a positive electrode film layer on the positive electrode sheet disposed adjacent to the negative electrode sheet where the nonreactive region is located, and the at least one nonreactive region being provided with a prelithiation layer; wherein total capacity of the secondary battery is Q, total capacity from prelithiation of all the prelithiation layers is QLi, and QLi meets the following condition: 0.5% Q?QLi?10% Q.

Abstract: The present application relates to a silicon-carbon composite material in the form of particles comprising a porous carbon skeleton, a silicon-containing deposition layer, and a carbon-containing coating layer, wherein the silicon-containing deposition layer is in pores of the porous carbon skeleton, the carbon-containing coating layer is on the silicon-containing deposition layer and/or on the surface of the particles, and the silicon-carbon composite material has an oil absorption number of 35 mL/100 g to 80 mL/100 g. The silicon-carbon composite material of the present application has a high energy density and an improved cycle life. In addition, the present application further relates to a negative electrode plate comprising the material, a secondary battery, a battery module, a battery pack, and a power consuming device.

Abstract: This application relates to a silicon-carbon composite material. The silicon-carbon composite material includes a carbon nanotube-and-porous carbon composite substrate and a silicon-based material. The porous carbon is connected to the carbon nanotube by a connecting unit in the carbon nanotube-and-porous carbon composite substrate. The high conductivity and strong mechanical properties of the carbon nanotubes can improve the overall conductivity, compression resistance, and expansion resistance of the silicon-carbon composite material, thereby improving cycle performance, electrode plate cycle expansion resistance, and rate performance of a secondary battery.

Abstract: A silicon-carbon composite material and a preparation method thereof, a negative electrode plate, and a secondary battery are disclosed. The silicon-carbon composite material includes a porous carbon matrix and silicon-based particles. The porous carbon matrix internally includes a plurality of pore channels with a width of 5 nm-50 nm. The silicon-based particles are distributed in the pore channels, and the porous carbon matrix meets: 1.0×10?7?Vtotal/Stotal?10.0×10?7, where Stotal is the total surface area occupied by the pore channels with the width of 5 nm-50 nm, and the measurement unit is: ×104 cm2/g; and Vtotal is the total pore volume occupied by the pore channels with the width of 5 nm-50 nm. The silicon-carbon composite material has high electrical conductivity. When being applied to a negative electrode of the secondary battery, the silicon-carbon composite material can effectively increase the volume capacity and energy density of the secondary battery.

Abstract: This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm?0.5×?{square root over (a2+b2)}?15 cm, and a?15 cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.

Abstract: The present application provides a silicon-carbon composite, a method of preparing the same, and a secondary battery including the silicon-carbon composite. The silicon-carbon composite includes porous carbon-based matrix particles having a three-dimensional network interconnecting pore structure; and silicon-based nanoparticles, at least a portion of which is provided in the three-dimensional network interconnecting pore structure. The present application enables secondary batteries to have an improved cycle performance and energy density.

Abstract: The present disclosure provides a secondary battery including a negative electrode plate, and the negative electrode plate includes: a negative electrode current collector, a first negative electrode active material layer, and a second negative electrode active material layer. The first negative electrode active material layer is arranged on at least one surface of the negative electrode current collector, and the first negative electrode active material layer includes a silicon-based material and a porous material; and the second negative electrode active material layer is arranged on a surface of the first negative electrode active material layer away from the negative electrode current collector.

Abstract: Provided are a negative electrode active material and a preparation method thereof, a secondary battery, and an electric apparatus. The negative electrode active material includes: a core material; and a first coating layer provided on at least part of a surface of the core material, where the first coating layer includes a porous carbon material and nano silicon-based particles, and the nano silicon-based particles are embedded into pore structures of the porous carbon material.