Preparation method of electrode sheet including PTC coating layer and lithium ion battery

Abstract

The invention provides a preparation method of an electrode sheet including a PTC coating layer and a lithium ion battery including the electrode sheet, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: step 1: according to the number of parts by weight, 400-1000 parts of solvent, 50-100 parts of high-molecular polymer and 0. 5-3 parts of conductive agent are uniformly stirred and then 0. 1-5 parts of mixed reagent of high-voltage-resistant crosslink agent and initiator are added, wherein the mass fraction of the initiator in thehigh-voltage-resistant crosslinking agent is 0. 1-2%, and the mixture is stirred for 2-8 hours so as to obtain a coating slurry; step 2: the coating slurry is coated on a current collector and driedat 80-120 DEG C for 2-6h so as to obtain the current collector coated with the PTC coating layer; and step 3, the electrode sheet slurry is uniformly coated on the current collector and dried, rolledand pressed and sliced so as to obtain the lithium ion battery electrode sheet including the PTC coating layer. The molecular design method is used and the high-voltage-resistant crosslink structure system is introduced so as to effectively improve the compatibility and the processing performance of the PTC coating layer and the electrode sheet.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a pole piece containing a PTC coating and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of long service life and high energy density, and have been widely used at present. At present, the main problem that restricts the application of lithium-ion batteries is the problem of poor safety. Since the current mainstream lithium-ion battery products use organic liquid electrolytes, there are safety problems such as electrolyte leakage, fire, and explosion during use, and various safety accidents occur frequently. In order to improve the safety performance of lithium-ion batteries, technologies such as special separators and positive temperature coefficient materials (Positive Temperature Coefficient, PTC) are mainly used. Among them, special separators cannot block thermal side react...

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Problems solved by technology

[0004] In order to improve the safety performance of lithium-ion batteries, the Chinese invention patent application with application number CN201410661206.9 discloses a multi-layer PTC coating with binder, positive temperature type materials and conductive agents as materials to improve lithium-ion batteries. safety performance, but the PTC coating in this patent application requires a special processing technology, which is applied to the existing lithium-ion battery manufacturing process, and there are problems such as high cost

The Chinese invention patent application with the application number CN201610446371.1 discloses a PTC coating prepared from porous ceramic heat-sensitive materials, conductive agents, and binders. The PTC coating uses water-based materials to effectively reduce energy consumption and processing costs. , but the porous ceramic heat-sensitive material used in this patent application has discontinuity, which affects its effect