Electrode plate and electrochemical device

Abstract

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector, an electrode active material layer arranged on at least one surface of the current collector, and an electric connection component electrically connected with the current collector, the current collector comprises a supporting layerand a conductive layer arranged on at least one surface of the supporting layer, the thickness D2 of a single surface of the conductive layer satisfies the following formula: D2<=D2<=1. D2 is greaterthan or equal to 30nm and less than or equal to 3[mu]m; the supporting layer is a high polymer material layer or a high polymer composite material layer; the electrode active material layer comprisesan electrode active material, a binder and a conductive agent; seen from the width direction of the coated surface of the electrode plate, the coated electrode active material layer comprises 2n+1 (n=1, 2 or 3) areas based on the compaction density, the compaction density of the middle area is higher than the compaction density of the two side areas, and a support protection layer is arranged on the surface of the extension area of the current collector.

Description

technical field [0001] The present application relates to the field of batteries, in particular, to an electrode sheet and an electrochemical device. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. With the continuous expansion of the application range of lithium-ion batteries, the requirements for the gravimetric energy density and volumetric energy density of lithium-ion batteries are also getting higher and higher. [0003] In order to obtain lithium-ion batteries with high mass energy density and volume energy density, lithium-ion batteries are usually improved as follows: (1) select positive electrode materials or negative electrode materials with high discharge specific capacity; (2) optimize the mechanical design of lithium-ion batteries , to minimize its volume; (3) select a positiv...

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Problems solved by technology

[0005] For pole pieces and batteries using metal-coated plastic current collectors (composite current collectors), although the energy density is improved, it may cause some problems or performance degradation in terms of processing performance and electrochemical performance.

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