Electrode sheet and lithium ion battery

Abstract

The present invention provides an electrode sheet and a lithium ion battery. The electrode sheet comprises a current collector and an active-material-containing active material layer arranged on at least a surface of the current collector, wherein the electrode sheet further comprises an insulating colloid substance coated on at least an edge of the active material layer. The lithium ion battery comprises the electrode sheet. According to the present invention, the insulating colloid substance is coated on at least an edge of the active material layer, can enhance the adhesion between the edge of the active material layer and the current collector, and can reduce the shedding of the edge of the active material layer, such that the metal exposing of the current collector due to the shedding of the edge of the active material layer can be avoided, and the battery micro-short circuit caused by burr produced during the electrode sheet cutting process can be avoided so as to improve the safety performance of the lithium ion battery using the electrode sheet.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to an electrode pole piece and a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries have been widely used in electronic devices such as mobile phones, digital cameras, and electric vehicles because of their high discharge capacity, good cycle performance, environmental friendliness and pollution-free. [0003] In the preparation process of lithium-ion secondary battery electrode pole pieces, refer to figure 1 , first of all, it is necessary to coat the active material layer 2 on one surface 11 of the current collector 1, then form the tab lead-out end on the current collector 1 by cutting at the edge of the current collector 1, and finally cut the electrode The pole piece is cut to the appropriate width. [0004] During the actual use of the electrode sheet prepared by this method, the edge 21 of the active material layer 2 on the current colle...

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Problems solved by technology

[0004] During the actual use of the electrode sheet prepared by this method, the edge 21 of the active material layer 2 on the current collector 1 is likely to fall off from the current collector 1 under the action of an external force, causing the metal of the current collector 1 to be exposed. At the same time, In the process of preparing the electrode pole piece, metal burrs will be generated on the cutting and cutting edge of the current collector 1 during the process of cutting the current collector 1 to form the tab lead-out end and cutting the electrode pole piece, and the metal of the current collector is exposed and Metal burrs on the edge will affect the safety performance of lithium-ion secondary batteries

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