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Solid-state lithium air battery

An air battery and solid-state lithium technology, applied in secondary batteries, solid electrolytes, circuits, etc., can solve the problems of reducing the energy density of lithium-air batteries, it is difficult to build a three-phase interface, and lithium-air cannot be used to achieve safety. Improves, inhibits lithium dendrites, and prolongs service life

Inactive Publication Date: 2020-12-29
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the positive electrode of lithium-air battery is a three-phase interface composed of gas channels, lithium ion channels and electronic channels. The design of the positive electrode of lithium-air battery system with inorganic ceramics as electrolyte is too complicated, and it is difficult to build a three-phase interface; and the inorganic ceramics The use will greatly reduce the energy density of lithium-air batteries, and the advantages of lithium-air cannot be exerted

Method used

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Examples

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preparation example Construction

[0028] The present invention also provides a preparation method of a solid-state lithium-air battery, comprising the following steps: in an inert atmosphere or a dry atmosphere, a lithium negative electrode, a diaphragm, and an air positive electrode are arranged in the inner layer of a package casing to assemble the battery, wherein the lithium negative electrode, the diaphragm 1. The air positive electrode and the packaging shell form a housing cavity that can accommodate the electrolyte; the air positive electrode is connected to the diaphragm and is located on the side of the diaphragm away from the lithium negative electrode, the electrolyte is injected into the housing cavity, and the battery is packaged. After the battery is packaged, it does not touch the air; stand still After a period of time, after the electrolyte is polymerized, a solid-state lithium-air battery can be obtained; then the sealed window or air port on the positive side of the air is opened to connect t...

Embodiment 1

[0036] A solid-state lithium-air battery, comprising an air positive electrode, an electrolyte, a lithium negative electrode, and a packaging shell with an opening and closing function, the preparation method of which is as follows:

[0037] S1: Preparation of air positive electrode: Weigh carbon nanotube (CNT) and polytetrafluoroethylene (PTFE) binder at a mass percentage of 95:5, use deionized water as a dispersant, stir it evenly; then spray The method is to spray the slurry evenly on the aluminum mesh of the current collector, put it in an oven at 55°C for drying; then transfer it to a vacuum oven at 110°C for 12 hours to completely volatilize the dispersant;

[0038] S2: Preparation of the electrolyte: the polymerized monomer is 1,3-dioxolane (DOL), the volume accounts for 50% of the total volume of the electrolyte, and the organic solvent is tetraethylene glycol dimethyl ether (G4), which accounts for 50% of the total volume of the solution. 50% of the volume, the lithiu...

Embodiment 2

[0050] Other conditions are the same as in Example 1, except that S1) the preparation of the air positive electrode, the preparation method of Example 2 is: Ketjen black (KB) and polyvinylidene fluoride (PVDF) binder are mixed in a mass percentage of 92 : 8 weighed, with N-methylpyrrolidone (NMP) as a dispersant, it was stirred evenly to make a slurry; then the slurry was evenly sprayed onto the current collector carbon paper by the method of spraying, and put into a 55 ℃ oven for drying Dry; then transfer to a vacuum oven at 110°C for 12 hours to completely volatilize the dispersant.

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Abstract

The invention provides a solid-state lithium air battery. The battery comprises a lithium negative electrode, an electrolyte, an air positive electrode and a packaging shell with an opening and closing function, wherein the electrolyte comprises an electrolyte with a curing function and a diaphragm, the lithium negative electrode, the diaphragm, the air positive electrode and the packaging shell form an accommodating cavity for accommodating the electrolyte, the air positive electrode is connected with the diaphragm, and the diaphragm is a porous film; the electrolyte at least comprises a polymeric monomer and a lithium salt, and the concentration of the lithium salt in the electrolyte is 0.2-7 mol / L. The battery is advantaged in that a polymer or a protective layer can be formed on the surface of the lithium negative electrode through in-situ solidification of the electrolyte, the protective layer can inhibit lithium dendrites, uniform deposition of lithium ions on the negative electrode is achieved, meanwhile, the effect of a gas protective layer is achieved, and direct reaction of oxygen, water, carbon dioxide and other gases with the lithium negative electrode is isolated; besides, after the electrolyte is subjected to in-situ polymerization to form a polymer, a problem of electrolyte volatilization of a liquid system of a traditional lithium-air battery can be solved, so the service life of the lithium-air battery is prolonged, and use safety of the lithium-air battery is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field related to lithium-air secondary batteries, and in particular relates to a solid-state lithium-air battery. 【Background technique】 [0002] Lithium-air batteries have a theoretical energy density 10 times higher than traditional lithium-ion batteries, and are the ultimate goal of lithium-ion battery development. Lithium-air batteries usually use metallic lithium or lithium-containing materials as the negative electrode, oxygen or air as the positive electrode, and non-aqueous organic electrolytes, aqueous electrolytes, polymer electrolytes, and solid electrolytes as the working electrolyte. The electrolyte and positive and negative electrodes can also be mobile phases. The most widely studied is the lithium-air battery with non-aqueous organic electrolyte. Its theoretical energy density can reach 3500Wh / kg, which is much higher than any existing lithium-ion battery system. Even if it only exerts 1 / 4 of its...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M10/0565
CPCH01M10/0565H01M12/08H01M2300/0082H01M2300/0085Y02E60/10
Inventor 彭佳悦黄杰刘丹宪俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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