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 negative electrode. The lithium protected negative electrode is made of a lithium sheet, a diaphragm, and a lithium ion solid electrolyte sheet sealed in an aluminum-plastic packaging bag. There is an electrolyte, and there is a window on the aluminum-plastic packaging bag. The lithium-ion solid electrolyte sheet seals the window on the aluminum-plastic packaging bag through the packaging glue. The packaging glue is high-density polyethylene ear glue or high-density polyethylene / polypropylene composite Pole ear gel. The preparation method comprises the preparation of a lithium ion solid electrolyte sheet pasted with encapsulation glue, the preparation of a lithium-protected negative electrode and battery assembly. The lithium seawater battery of the present invention has the advantages of good sealing performance, excellent discharge stability, long discharge time, and high energy density. It can work stably for more than 20 days in simulated seawater, and its energy density can exceed 600Wh / kg. The preparation method has a packaging process The advantages of simplicity, precise and controllable process.

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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