Upright graphene/nano-silver composite material and preparation method and application thereof

Abstract

The invention discloses a preparation method of a vertical graphene / nano-silver composite material, and the method comprises the following steps: S1, spraying a graphene oxide solution on a substrate to form a horizontal graphene arrangement layer; S2, spraying a template solution and a graphene oxide solution on the horizontal graphene arrangement layer at the same time to obtain a precursor; S3, performing heat treatment on the precursor material, and then performing cleaning and drying to form an upright graphene array layer to obtain a columnar upright graphene array material; S4, dipping the columnar upright graphene array material in a nano-silver solution, and then performing drying to remove a solvent; S5, carrying out heat treatment on the columnar upright graphene array material impregnated with the nano-silver in an inert atmosphere to obtain the upright graphene / nano-silver composite material. The invention also discloses the upright graphene / nano-silver composite material prepared by the method and application thereof. The application comprises the following two aspects: application as a current collector material and application in preparation of a battery.

Description

technical field [0001] The invention relates to the technical field, in particular to an upright graphene / nano-silver composite material and its preparation method and application. Background technique [0002] With the rapid development of mobile electronic devices and electric vehicles, rechargeable battery systems with high energy density have received extensive attention and research interest from researchers. In many battery systems, lithium metal has the lowest reduction potential (-3.04V, compared to standard hydrogen electrodes), extremely high theoretical specific capacity (3860mAhg-1) and low density (0.54gcm-3), It can be used as a negative electrode to match with high-energy positive electrode materials (such as sulfur positive electrode, oxygen positive electrode and layered oxide positive electrode) to construct a lithium metal battery system with high-quality energy density, so it is considered to be the most ideal battery system. However, a large number of p...

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Problems solved by technology

At the same time, studies have shown that low electrode tortuosity (i.e., array structure) can form a more uniform ion distribution, which is more conducive to adjusting the deposition morphology of metal lithium; while high electrode tortuosity can easily lead to metal lithium deposition on the surface, further hinder the transport of ions

However, an electrode carrier with low tortuosity and sufficient mechanical strength generally has a large weight and complicated production process, which not only reduces the overall energy density of the battery, but is also not suitable for practical application production.

The upright graphene array has low microstructure tortuosity and small mass, and is an ideal DC material, but it is usually prepared by chemical vapor deposition method, the preparation process is complicated and the preparation conditions are harsh; moreover, the upright graphene array Too compact, the array pitch is small, and the size growth in the vertical direction is limited

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