Abstract: A positive electrode plate includes a positive electrode current collector and two positive electrode active material layers on both surfaces of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material and graphene. And 7.74?Dv501/2+0.05 THK?10.2, Dv50 is a particle size of the positive electrode active material and THK is a thickness of the positive electrode plate. And 0.078?w*CW+0.01n?1.9, n is a quantity of layers of the graphene, w is a mass percentage of the graphene in the positive electrode active layer, and CW is a one-side coating weight of the positive electrode active material layer.

Abstract: An electrochemical device includes an electrode plate, the electrode plate includes: a first current collector; a first tab protruding from the first current collector; a first active material layer disposed on at least one surface of the first current collector; and an insulation layer disposed along a side edge of the first current collector towards the first tab and abutted against the first active material layer. The insulation layer includes a first region and a second region, the first region is disposed towards the first tab, the second region is disposed away from the first tab and abutted against the first active material layer, and a thickness of the first region of the insulation layer is less than a thickness of the second region of the insulation layer.

Abstract: An electrochemical device includes a positive electrode, the positive electrode includes a current collector and a film layer containing a positive active material. The film layer is disposed on at least one surface of the current collector. The positive active material includes a primary particle and/or a secondary particle. When a mass percent A of the primary particle in the positive active material based on a mass of the positive active material satisfies 20%?A?100%, the film layer, the positive active material, and the current collector satisfy: Dl?Dv99?Dc; and, when a mass percent A? of the primary particle in the positive active material based on the mass of the positive active material satisfies 0?A??20%, the film layer, the positive active material, and the current collector satisfy: Dl?1.1 Dv99.

Abstract: An electrochemical apparatus includes an electrode and an electrolyte. The electrode includes a current collector, an intermediate layer disposed on the current collector, and an active material layer disposed on the intermediate layer. The intermediate layer has a specific area ratio to the active material layer. The electrolyte includes a sulfur-oxygen double bond-containing compound. The electrochemical apparatus has improved direct current internal resistance and safety performance.

Abstract: A positive electrode and an electrochemical apparatus and an electronic apparatus containing the same. A positive electrode, the positive electrode including a current collector and a positive electrode active substance layer are disposed on the current collector, where the positive electrode active substance layer includes a positive electrode active material and graphene; and a ratio Dv50/D1 of a particle size Dv50 of the positive electrode active material to a sheet diameter D1 of the graphene is 0.45-4.5.

Abstract: An electrochemical apparatus includes an electrode plate, where the electrode plate has a current collector and an active material layer disposed on at least one surface of the current collector, the active material layer has at least one pore, and an included angle between an axial direction of the at least one pore and a plane on which a surface of the active material layer lies is ?, where ?°??<90°. This improves efficiency of the electrode plate in infiltration and absorption of the electrolyte, thereby improving rate performance, cycling performance, safety, stability, and other qualities of the electrochemical apparatus.

Abstract: A positive electrode plate includes a positive electrode current collector and two positive electrode active material layers on both surfaces of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material and graphene. And 7.74?Dv501/2+0.05 THK?10.2, Dv50 is a particle size of the positive electrode active material and THK is a thickness of the positive electrode plate. And 0.078?w*CW+0.01n?1.9, n is a quantity of layers of the graphene, w is a mass percentage of the graphene in the positive electrode active layer, and CW is a one-side coating weight of the positive electrode active material layer.