Positive electrode sheet, electrochemical device, and electronic device

Abstract

The embodiment of the invention provides a positive pole piece, an electrochemical device and an electronic device. The positive pole piece comprises a current collector, a first layer and a second layer. The first layer includes at least one selected from a ceramic material, a carbon-based material, a first active material, and an organic material. The second layer is disposed between the currentcollector and the first layer, the second layer includes a second active material, and the surface of the second layer is alkaline. According to the invention, the second layer is arranged between the current collector and the first layer, direct contact between the second layer with the alkaline surface and a diaphragm coating is avoided, such that the chemical damage effect of the second activematerial of the second layer on the diaphragm coating is avoided, the adhesion force between a positive electrode sheet and a diaphragm is improved, deformation of the electrode assembly during use is improved, and the service life of the electrochemical device is prolonged.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a positive pole piece, an electrochemical device and an electronic device. Background technique [0002] In the existing electrode assembly structure, the positive pole piece is in direct contact with the separator with an adhesive layer, especially in some electrode assemblies, the surface of the separator substrate is coated with polyacrylate material. It has been confirmed that the polyacrylate coating of the separator has strong adhesion to the negative electrode active material (for example, graphite), and the polyacrylate coating is coated with an aqueous solution, which is coated on both sides of the separator substrate. , low processing cost, environmentally friendly, and conducive to industrial production, so it is an industry trend to coat polyacrylate coatings on the isolation film. [0003] However, for the electrode assembly structure of a positive ele...

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Problems solved by technology

[0003] However, for the electrode assembly structure of a positive electrode sheet containing an active material (for example, a ternary material) that is alkaline on the surface, the surface of the positive electrode sheet containing the active material is relatively strong, causing the active material to be isolated from some The polymer component of the coating of the membrane is chemically destroyed, so that the adhesion between the positive pole piece and the separator is very weak, and there is not enough adhesion between the positive pole piece and the separator, which will cause the electrode assembly to break down during use. Severely deformed

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