A flexible porous current collector and a preparation method thereof

Abstract

The invention relates to a flexible porous current collector and a preparation method thereof, belonging to the technical field of battery current collector materials. The current collector comprisesa flexible porous conductive substrate and an ultrathin conductive metal layer plated on the surface of the flexible porous conductive substrate; The flexible porous conductive substrate is a porous film formed by uniformly dispersing the conductive powder material in the polymer material. At first, that polymer and the conductive pow material are melted and uniformly mix, and a flexible porous conductive substrate is prepared on a lithium battery separator production equipment by a dry double-pulling method; Then an ultra-thin conductive metal layer is deposited on the surface of the flexibleporous conductive substrate by vacuum evaporation or electroplating to obtain the flexible porous current collector. The invention has the advantages that the base material is a conductive powder andthe polymer are uniformly compounded, and has the characteristics of good flexibility, high tensile strength, high conductivity and low density, and the conductivity and tensile strength of the basematerial can be further improved after an ultra-thin conductive metal layer is plated on the base material.

Description

technical field [0001] The invention belongs to the technical field of battery current collector materials, and in particular relates to a flexible porous current collector and a preparation method thereof. Background technique [0002] With the development of wearable devices, the demand for flexible energy storage devices such as flexible supercapacitors, flexible lithium-ion capacitors, and flexible lithium-ion batteries is increasing. Among them, the flexible current collector is the key material restricting the development of flexible energy storage devices. Existing current collectors for batteries, such as copper foil, aluminum foil, stainless steel foil, copper foam, nickel foam, etc., have certain flexibility, but they still have the disadvantages of insufficient toughness and poor bending resistance when used as flexible battery current collectors. [0003] One solution is to use metal wires to weave into mesh or fabric, such as copper mesh, stainless steel mesh, ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor flexibility, low strength, poor conductivity, and poor ultra-thin and ultra-light performance of existing current collectors, and provide a flexible porous current collector and its preparation method. The prepared current collector has strong conductivity , strong bending resistance, high strength, easy processing, conductivity > 1*10 3 s / m, the tensile strength is 50~200 MPa, and the bending radius of 1cm can be bent more than 10,000 times, while maintaining its ultra-thin and ultra-light performance, which can increase the energy density when used in batteries

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