Abstract: The present disclosure discloses a cathode plate and a lithium ion battery, and relates to the field of battery technologies. The cathode plate includes a cathode current collector and a cathode active material layer provided on the cathode current collector, wherein the compact density of the cathode active material layer is a g/cm3, where 2.9?a?3.5; the areal density of the cathode active material layer is b g/cm2, where 0.012?b?0.018; and the mass percentage of the conductive agent in the cathode active material layer is c, where 2.4%?c?4.4%, and the cathode active material layer satisfies the formula below: 3.3<a2×b/c<5.5. The lithium ion battery prepared from the cathode plate can achieve excellent Direct Current Resistance (DCR) performance while ensuring the energy density of the battery cell.

Abstract: The present disclosure belongs to the technical field of electrode assemblies, and in particular, relates to an electrode assembly and a secondary battery. The electrode assembly comprises a cathode electrode plate, an anode electrode plate, and a separator, wherein the cathode electrode plate satisfies: 2.2<(a2?0.68a+1)*b/5c<31.2, and/or the anode electrode plate satisfies: 0.6<(d2?0.86d+1)*e/100f<8.2. Regarding the electrode assembly of the present disclosure, rational combination is performed according to the porosity of the cathode electrode and/or anode electrode active coating, the particle size of the active materials, and the mass percentage content of conductive carbon, so that the prepared electrode assembly and battery have a longer service life while being able to continuously provide a high-power output power.

Abstract: The disclosure belongs to the technical field of secondary batteries, and in particular, relates to a cell, including: a first separator, a positive electrode plate, a second separator and a negative electrode plate, wherein the first separator, the positive electrode plate, the second separator and the negative electrode plate are stacked in sequence to form a composite electrode plate, and the composite electrode plate is wound to obtain the cell; the cell includes a straight portion and corner portions arranged at two ends of the straight portion, and at least one surface of the positive electrode plate located at the corner portion is provided with a positive electrode buffer coating and/or at least one surface of the negative electrode plate located at the corner portion is provided with a negative electrode buffer coating.

Abstract: Disclosed are a cell and a secondary battery. The cell includes a cell body; a length of the cell body is L, and a thickness of the cell body is H; and the L and the H satisfy the following relational expression: L/H>7. According to the cell and the secondary battery provided in the disclosure, by reasonably designing a relationship between the length L and the thickness H of the cell body, that is, a ratio between the length L and the thickness H of the cell body is defined within a specific relational expression of L/H>7, the heat dissipation performance of the cell is improved, and the heat inside the cell is discharged to the outside timely, such that the service life and safety performance of the secondary battery are improved, thereby having a higher potential for market promotion.

Abstract: Disclosed are a positive electrode plate, a preparation method therefore and a lithium-ion secondary battery, relating to the technical field of batteries. The positive electrode plate includes a positive electrode current collector and a positive electrode coating layer that is coated on the positive electrode current collector and contains a positive electrode active substance; the positive electrode plate satisfies 0.07<a{circumflex over (?)}3*10*?/?<0.14, a represents the compaction density of the positive electrode coating layer, ? represents the surface density of the positive electrode coating layer, and ? represents the thickness of the positive electrode current collector. While the positive electrode plate satisfies the above formula, the compaction density, the surface density and the current collector thickness of the positive electrode plate may be reasonably configured, such that it satisfies the requirements of the formula 0.07<a{circumflex over (?)}3*10*?/?<0.

Abstract: A method for preparing an electrode material, an electrode material, and a battery are provided to resolve a prior-art problem that a silicon negative electrode material in a battery is prone to pulverization in a fully intercalated state. The electrode material includes a layered silicon core and graphene quantum dots. The layered silicon core includes at least two layers of silicon-based materials, an interlayer gap exists between two neighboring layers of the at least two layers of silicon-based materials, and the silicon-based material includes at least one of silicon or an oxide of silicon. The graphene quantum dots are located in the interlayer gap between the at least two layers of silicon-based materials.

Abstract: A composite material and a preparation method thereof are provided to solve the prior-art problem that a silicon anode material used in a battery is prone to cracking and pulverization. The composite material includes a layered silicon core and a plurality of carbon nanotubes. The layered silicon core includes a plurality of silicon-based material layers, and there is an interlayer spacing between two adjacent silicon-based material layers. Each silicon-based material layer has at least one through hole, and the silicon-based material layer includes silicon or silicon oxide. Each of the plurality of carbon nanotubes passes through the through holes on the plurality of silicon-based material layers.

Abstract: A method for preparing an electrode material, an electrode material, and a battery are provided to resolve a prior-art problem that a silicon negative electrode material in a battery is prone to pulverization in a fully intercalated state. The electrode material includes a layered silicon core and graphene quantum dots. The layered silicon core includes at least two layers of silicon-based materials, an interlayer gap exists between two neighboring layers of the at least two layers of silicon-based materials, and the silicon-based material includes at least one of silicon or an oxide of silicon. The graphene quantum dots are located in the interlayer gap between the at least two layers of silicon-based materials.