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Metal-oxygen secondary battery

A secondary battery and oxygen technology, applied in battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problem of the disordered growth of lithium peroxide hindering the effective occurrence of reactions, cracks and The growth direction of dendrites is uncontrollable, which hinders industrial utilization and other problems, and achieves the effects of solving dendrite effects, high stability, and favorable storage

Active Publication Date: 2017-07-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For example, although the lithium-oxygen battery has been successfully developed, the disordered growth of its product lithium peroxide seriously hinders the effective occurrence of the reaction during use. The volume expansion caused by the process leads to uncontrollable cracks and branch crystal growth directions. At the same time, a new solid electrolyte interface film is formed on the surface of the metal and the electrolyte, which reduces the Coulombic efficiency, increases the battery impedance, and leads to a short circuit of the battery, causing a series of safety hazards. problems, seriously hindering the large-scale industrial application

Method used

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Examples

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Embodiment 1

[0084] This embodiment provides a metal-air battery based on lithium-sodium alloy, its structure can refer to figure 1 As shown, the cathode gas (ie working gas) used in this embodiment is oxygen, and the battery number of this embodiment is marked as A1.

[0085] The negative electrode of the present embodiment is made of self-made lithium-sodium alloy sheet;

[0086] Wherein the lithium-sodium alloy sheet can be made by the following method:

[0087] Cut the dry lithium plate and the dry sodium strip into small pieces, mix the lithium and sodium pieces into a stainless steel container, heat the stainless steel container on a heater until the metal lithium and metal sodium inside melt, and record the melting temperature . Cool down to room temperature, and roll the resulting lithium-sodium alloy into flakes with a thickness of 0.2 to 0.3 mm. All the above operations are completed in an argon-protected glove box.

[0088] The lithium-sodium alloy prepared by the above-menti...

Embodiment 2

[0110] This embodiment provides a lithium-sodium alloy-oxygen rechargeable secondary battery, denoted as A2, whose structure is basically the same as that of the battery provided in embodiment 1. In this embodiment, the ratio of the metal negative electrode lithium and sodium alloy varies.

[0111] The negative electrode in this embodiment can be made by the following method:

[0112] Cut the dry lithium plate and the dry sodium strip into small pieces, mix the lithium and sodium pieces into a stainless steel container, heat the stainless steel container on a heater until the metal and metal sodium inside melt, and record the melting temperature. Cool down to room temperature, and roll the resulting lithium-sodium alloy into flakes with a thickness of 0.2 to 0.3 mm. All the above operations are completed in an argon-protected glove box.

[0113] The lithium-sodium alloy prepared by the above-mentioned steps of the present invention is detected. see figure 2 , figure 2 It...

Embodiment 3

[0122] This embodiment provides a lithium-sodium alloy-oxygen rechargeable secondary battery, denoted as A3, whose structure is basically the same as that of the battery provided in embodiment 1. In this embodiment, the ratio of the metal negative electrode lithium and sodium alloy varies.

[0123] The negative electrode in this embodiment can be made by the following method:

[0124] Cut the dry lithium plate and the dry sodium strip into small pieces, mix the lithium and sodium pieces into a stainless steel container, heat the stainless steel container on a heater until the metal and metal sodium inside melt, and record the melting temperature. Cool down to room temperature, and roll the resulting lithium-sodium alloy metal block into a thin sheet with a thickness of 0.2 to 0.3 mm. All the above operations are completed in an argon-protected glove box.

[0125] The lithium-sodium alloy prepared by the above-mentioned steps of the present invention is detected. see figure...

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Abstract

The invention provides a metal-oxygen secondary battery which comprises an anode, a cathode and an electrolyte, wherein the cathode comprises a lithium-sodium alloy. According to the invention, an unconventional alloy-lithium-sodium alloy is used as the cathode of the metal-oxygen secondary battery; in a discharging process, the oxygen is utilized to react and generate lithium peroxide and sodium peroxide which are attached to the anode and chemical energy is converted into electric energy; in a charging process, lithium peroxide and sodium peroxide on the anode are decomposed so as to release oxygen, so that the recycling of the oxygen is realized. The invention fills up the blank of the unconventional metal alloy applied to the technical field of an air cell and expands the research field of the air cell; the metal-oxygen secondary battery is simple and efficient; the crystal effect is solved and cracks generated by recycling are reduced; the metal-oxygen secondary battery has high stability and high use rate of atoms, meets the green chemical requirement and is beneficial to the storage and circulation of oxygen and the circular storage and utilization of large-scale renewable energy sources.

Description

technical field [0001] The invention relates to the technical field of metal-air secondary batteries, in particular to a metal-oxygen secondary battery, in particular to a metal-oxygen secondary battery based on a lithium-sodium alloy negative electrode. Background technique [0002] Air battery is a kind of chemical battery. Its construction principle is similar to that of dry battery. The difference is that its positive electrode active material is taken from oxygen or pure oxygen in the air. It is also called oxygen battery. It is usually divided into lithium-air battery according to the negative electrode material. , Zinc-air batteries, aluminum-air batteries and magnesium-air batteries. [0003] Zinc-air batteries use zinc as the negative electrode, sodium hydroxide or potassium hydroxide as the electrolyte, and the positive electrode is porous activated carbon, so the positive electrode can absorb oxygen in the air to replace the oxidant in general dry batteries. Zinc...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/40H01M12/08
CPCH01M4/134H01M4/405H01M12/08Y02E60/10
Inventor 张新波马金玲鲍迪徐吉静
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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