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Bipolar-structured lithium-air battery

A lithium-air battery and bipolar structure technology, which is applied to fuel cell type half cells and primary battery type half cells, etc., can solve the problems of corrosion of lithium anode and volatile organic liquid electrolyte, and achieve low mass transfer resistance, Improve the discharge specific energy and cycle life, reduce the effect of volatilization

Inactive Publication Date: 2011-11-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-air battery with a bipolar structure to overcome the problem that the organic liquid electrolyte is volatile and the organic liquid electrolyte is easy to absorb moisture, which causes the lithium negative electrode to corrode in the air

Method used

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Examples

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Embodiment 1

[0019] The structure of the lithium-air battery with bipolar structure in this embodiment is as follows: figure 1 As shown, it is composed of a negative electrode 1, a diaphragm 2, a positive electrode 3, an insulating case 4, and a stainless steel case 5; the lithium sheet as the negative electrode 1 is placed at the bottom of the insulating case 4, and the diaphragm 2 and the positive electrode 3 are placed in sequence on it. The insulating housing 4 is placed in the middle of two stainless steel housings 5 ​​and fixed by screws.

[0020] The positive electrode is fabricated by prefabricating a chemically stable, non-volatile hybrid electrolyte on hydrophobic carbon paper. When placing the positive electrode, the side with the mixed electrolyte faces the negative electrode. The mixed electrolyte solution is formed by mixing hydrophobic pyridine ionic liquid, lithium hexafluorophosphate and dinuclear cyclic ammonium salt of hexafluorophosphate. The prefabrication method is ...

Embodiment 2

[0024] The catalyst is PtAu, the electrolyte content is 40wt.%, and the catalyst loading is 4mg / cm 2 , other conditions are the same as in Example 1.

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Abstract

The invention discloses a bipolar-structured lithium-air battery, which belongs to the technical field of preparation of lithium-air batteries. The bipolar-structured lithium-air battery mainly comprises a cathode, a diaphragm, an anode and a housing, wherein lithium metal as the cathode is arranged inside the housing, and the diaphragm and the anode are sequentially arranged at the upper part of the lithium metal; and the battery does not contain the traditional electrolytic solution layer, and the anode is obtained by preparing a non-volatile electrolytic solution with stable chemical property on a perforated electrode. The bipolar-structured lithium-air battery disclosed by the invention has the advantages of simple structure, small mass transfer resistance, and capabilities of reducing the volatilization of electrolytic solution, decelerating the cathode corrosion, increasing the specific discharge energy capacity and prolonging the cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium-air battery preparation, and in particular relates to a bipolar lithium-air battery. Background technique [0002] A lithium-air battery is a battery that uses lithium metal as the negative electrode and oxygen in the air as the positive electrode reactant. Discharge process: Lithium at the negative electrode releases electrons and becomes lithium cations, lithium ions pass through the electrolyte material, and combine with oxygen and electrons flowing from the external circuit at the positive electrode to form lithium oxide (Li 2 O) or lithium peroxide (Li 2 o 2 ), and left on the positive electrode, the open circuit voltage of the Li-air battery is 2.91V. Lithium-air batteries have higher energy density than lithium-ion batteries because their positive electrodes (based on porous carbon) are light, and oxygen is taken from the environment rather than stored in the battery. Theoretically, sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06
CPCY02E60/128
Inventor 蔡克迪蒲薇华王诚张庆国牧伟芳任建国邓长生
Owner TSINGHUA UNIV
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