Lithium seawater battery and preparation method thereof

Abstract

The invention discloses a lithium seawater battery and a preparation method thereof. The lithium seawater battery comprises a lithium protected cathode, wherein the lithium protected cathode is prepared by sealing a lithium piece, a diaphragm and a lithium ion solid electrolyte piece into an aluminum plastic packaging bag, the diaphragm is infiltrated into electrolyte, a window is formed in the aluminum plastic packaging bag and is sealed by the lithium ion solid electrolyte piece through a packaging adhesive, and the packaging adhesive is a high density polyethylene lug adhesive / polypropylene composite lug adhesive. The preparation method comprises the steps of preparing the lithium ion solid electrolyte piece adhered with the packaging adhesive, preparing the lithium protected cathode, and assembling the battery. The lithium seawater battery disclosed by the invention has the advantages of good sealing performance, excellent discharging stability, high energy density and the like and can stably work for above 20 days in simulated seawater, and the energy density can exceed 600Wh / kg; the preparation method of the lithium seawater battery has the advantages that the packaging process is simple, and the flow is fine and controllable.

Description

technical field [0001] The invention belongs to the field of battery manufacturing, and relates to a lithium seawater battery and a preparation method thereof. Background technique [0002] Lithium seawater battery is a battery system that uses seawater as the positive electrode active material and metal lithium as the negative electrode. Seawater batteries directly use seawater as the positive electrode active material, which can reduce the weight of the power system and have a long storage life. Its theoretical energy density can exceed 2000 Wh / kg. It can be used for underwater resource exploration, autonomous underwater vehicles, Unattended underwater information platforms and other underwater devices that have high requirements for battery energy density provide high-performance underwater energy. [0003] Due to the strong reactivity of lithium flakes with water, it is necessary to seal the lithium flakes in order to fully reflect the energy density advantages of lithi...

AI Technical Summary

Problems solved by technology

This method requires the polymer binder to have good bonding properties to both the window material and the electrolyte sheet. However, due to the large difference in the properties of the two types of materials, currently commonly used polymer binders such as epoxy resin and silicone rubber It is difficult to meet the sealing and bonding requirements for window materials and electrolyte materials at the same time

Due to the shortcomings of the above two sealing methods, the existing lithium seawater negative electrode is prone to water seepage, which leads to the failure of lithium seawater batteries, and it is difficult to reflect the advantages of its high energy density.

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