Preparation method of composite metal anode for secondary battery and product thereof

Abstract

The invention belongs to the related field of secondary battery preparation technology, and discloses a preparation method of a composite metal anode for a secondary battery. The preparation method comprises the following steps: forming a plurality of hoes in an array type through a photosensitive film on a thin film made of a current collector; depositing a metal electrode material internally corresponding to each hole; continuously filling a composite electrolyte solution on the surface of the metal electrode material, and enabling the surface of the metal electrode to be covered with the composite electrolyte in a solid state finally, wherein the side face of the composite electrolyte is fixed by the photosensitive film. The invention also discloses a corresponding product prepared through the technology. Through the preparation method and the product, the metal anode for the secondary battery with a protective film and a fixing structure at the same time can be prepared in convenient operation and high efficiency manners, and negative reaction and dendritic crystal production of the metal anode and the electrolyte can be inhibited at the same time, so that the harmful effects such as volume expansion and low energy density caused by the protective film can also be obviously reduced, and the composite metal anode is particularly suitable for application occasions of industrial large-scale production.

Description

technical field [0001] The invention belongs to the related field of secondary battery preparation technology, and more specifically relates to a preparation method of a composite metal negative electrode for a secondary battery and a product thereof. Background technique [0002] Secondary batteries are an important medium for electric energy transfer, and have been widely used in portable electronic products, electric vehicles, energy storage and other fields. In secondary batteries, metal electrodes such as Li and Na have the advantages of high capacity and low electrode potential, so they are usually used as negative electrodes for secondary batteries such as Li-S batteries, lithium-ion batteries, sodium-ion batteries, and room temperature Na-S batteries. Material. However, in commercial applications, direct use of metal electrodes such as Li and Na as negative electrodes is regarded as one of the technical problems in this field. This is because metal electrodes such a...

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Problems solved by technology

However, further studies have also shown that polymer electrolytes are prone to volume expansion and even fall off during charging and discharging or soaking in the electrolyte; especially when polymer electrolytes are prepared by solution casting or spin coating methods , often have problems such as limited size, difficulty in large-scale production, and expansion and detachment, which lead to adverse effects on the performance of metal electrodes such as Li and Na.

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