An electrode pole piece and an electrochemical device

Abstract

The present application relates to the field of batteries, in particular, to an electrode sheet and an electrochemical device. The electrode sheet of the present application includes a current collector and an electrode active material layer disposed on at least one surface of the current collector, wherein the current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer, the The single-side thickness D2 of the conductive layer satisfies: 30nm≤D2≤3μm, and a conductive primer layer comprising a conductive material and a binder is also provided between the current collector and the electrode active material layer, and the conductive The conductive material of the undercoat layer contains at least one of a one-dimensional conductive material and a two-dimensional conductive material. The electrode pole piece of the present application has good processability, and the electrochemical device including the electrode pole piece has high energy density, good electrical performance and long-term reliability.

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...

AI Technical Summary

Problems solved by technology

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

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