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Lithium-air battery structure

An air battery, lithium negative electrode technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of complex process and limited time for effect maintenance.

Active Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These measures are either complex in process, or have a limited duration of effect

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Blend 100mg KB600 carbon powder with polytetrafluoroethylene emulsion (PTFE, 5% mass fraction) in ethanol to obtain electrode slurry, wherein the mass ratio of carbon powder to polytetrafluoroethylene is 4:1, solid matter The ratio of the solvent to the solvent is 20 mg solid / ml solvent; the flake carbon layer is prepared by rolling, and dried at 60 degrees Celsius. The surface density of the carbon material in the carbon layer is 0.5 mg / cm 2 .

[0026] Using KB600 as the electrode material, the same process as above was used to prepare the positive electrode for lithium-air batteries, wherein the areal density of the carbon material was 3 mg / cm 2 .

[0027] Using 1M LiTFSI / TEGDME as the electrolyte, the metal lithium negative electrode, porous carbon layer, porous polypropylene separator, and positive electrode were laminated in sequence to assemble a lithium-air single cell. In a pure oxygen atmosphere of 1.2 atmospheres, a current density of 50mA / g (based on the ma...

Embodiment 2

[0029] Blend 100mg of graphene and polytetrafluoroethylene emulsion (PTFE, 5% mass fraction) in ethanol to obtain electrode slurry, wherein the mass ratio of graphene to polytetrafluoroethylene is 5:1, solid matter and The solvent ratio is 15 mg solid / ml solvent; the sheet-like carbon layer is prepared by rolling, and dried at 60 degrees Celsius. The surface density of the carbon material in the carbon layer is 0.5 mg / cm 2 .

[0030] The positive electrode for the lithium-air battery was prepared by the same process as in Example 1, the single cell was assembled by the same process, and the cycle test was carried out by the same charge and discharge mechanism. Compared with the non-functional layer battery structure, when the discharge cut-off voltage is 2V, the number of cycles when the discharge capacity is lower than 1000mAh / g is increased by 25.

Embodiment 3

[0032] Blend 100mg of carbon nanotubes and PVDF in NMP at a mass ratio of 5:1 to obtain an electrode slurry, the ratio of solid matter to solvent is 15mg solid / ml solvent; using a scraper coating method, prepare a flake on the surface of porous polypropylene Carbon layer, dried at 60 degrees Celsius, the surface density of carbon material in the carbon layer is 0.5mg / cm 2 .

[0033] The positive electrode for the lithium-air battery was prepared by the same process as in Example 1, the single cell was assembled by the same process, and the cycle test was carried out by the same charge and discharge mechanism. Compared with the non-functional layer battery structure, when the discharge cut-off voltage is 2V, the number of cycles when the discharge capacity is lower than 1000mAh / g is increased by 27.

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Abstract

The invention relates to a lithium-air battery structure, including a lithium negative electrode, a porous diaphragm and a positive electrode which are sequentially laminated, an electrically conductive porous function layer is arranged between the lithium negative electrode and the porous diaphragm, the electrically conductive porous function layer is an electrically conductive porous carbon material layer or a composite layer of an electrically conductive porous carbon material and catalytic components, and mass ratio of electrically conductive porous carbon material to other functional components is 20:1 to 2:1. By the electrochemical reaction of the conductive porous functional layer and dissolved diffused oxygen or reactive oxygen species, the dissolved diffused oxygen or reactive oxygen species can be effectively consumed, the corrosion and damage to the lithium negative electrode can be reduced, and substantial improvement of the battery stability can be facilitated.

Description

technical field [0001] The invention belongs to the field of lithium-air batteries, and in particular relates to a lithium-air battery structure. Background technique [0002] With the rapid development of electronics, communication equipment and electric vehicles, people put forward higher requirements for battery performance. Lithium-air battery is a secondary battery that uses metallic lithium as the negative electrode and oxygen as the positive electrode active material. Metal lithium as the negative electrode material has the lowest theoretical voltage, and its theoretical specific capacity is as high as 3,862mAh / g, while oxygen as the positive electrode active material can be obtained directly from the air. Therefore, lithium-air batteries have extremely high specific energy. It has great application prospects in civil and military fields. [0003] The biggest problem restricting the commercial application of lithium-air batteries is its low cycle life, which is det...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M4/86
CPCY02E60/10
Inventor 张益宁张华民吴宝山李婧周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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