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Lithium-air battery and preparation method thereof

A lithium-air battery and lithium salt technology, applied in the field of electrochemical energy, can solve the problems of poor cycle performance of lithium-air batteries, achieve excellent cycle performance, high energy efficiency, and control the effect of positive electrode corrosion

Inactive Publication Date: 2013-12-25
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a lithium-air battery with excellent cycle performance to solve the problem of poor cycle performance of current lithium-air batteries

Method used

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  • Lithium-air battery and preparation method thereof
  • Lithium-air battery and preparation method thereof
  • Lithium-air battery and preparation method thereof

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preparation example Construction

[0047] The preparation method of the lithium-air battery with excellent cycle performance of the present invention comprises the following steps:

[0048] A. Configuration of Electrolyte Solution

[0049] mixing the lithium salt with sulfolane to prepare an electrolyte solution, wherein the concentration of the lithium salt is 0.5-5mol / L;

[0050] B. Production of positive electrode

[0051] (1) Mix porous conductive carbon and lithium peroxide, grind and mix with polytetrafluoroethylene to obtain a mixture; (2) Add the mixture to N-methylpyrrolidone, stir at 40-80°C to obtain Mixing the slurry; (3) coating the mixed slurry on a carbon paper current collector and drying to obtain a positive electrode;

[0052] C. Production of negative electrode

[0053] Lithium metal is the negative electrode;

[0054] D. Encapsulating the electrolyte solution, positive electrode, and negative electrode in an inert gas atmosphere to obtain the lithium-air battery.

Embodiment 1

[0057] A. Preparation of Electrolyte Solution

[0058] Weigh 0.1mol of LiTFSI, measure 0.1L of liquid sulfolane solvent, and slowly add lithium salt into the sulfolane solvent under the environmental conditions of water content less than 0.5ppm, stir thoroughly for 1 hour to prepare a uniform electrolyte with a concentration of 1mol / L solution. The content of free acid and water in the electrolyte is required to be less than 10ppm.

[0059] B. Preparation of positive electrode

[0060] First, measure 4.05 g of porous conductive carbon and 4.95 g of lithium peroxide, and use an agate mortar to manually grind or automatically grind with a ball mill to obtain a uniform mixture of porous conductive carbon and lithium peroxide. The above mixture was added to 1 g of polytetrafluoroethylene (PTFE) to form a mixture. The above mixture was added to 20 g of methylpyrrolidone (NMP) dispersant, and blended in a magnetic heating stirrer at a temperature of 40-80° C. for 4 hours to form ...

Embodiment 2

[0064] Other conditions are the same as in Example 1, except that the lithium salt used in the electrolyte solution preparation is changed to be 0.1mol of LiPF 6 .

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Abstract

The invention provides a lithium-air battery which comprises an anode, a cathode and an electrolyte system, wherein the anode comprises a porous hydrophobic carbon paper current collector and a coating layer on the porous hydrophobic carbon paper current collector; the cathode refers to lithium metal; the electrolyte system refers to sulfolane and lithium salt. The sulfolane has a relatively high electric medium constant and relatively high chemical stability; an electrochemical window of sulfolane-based electrolyte is wide and relatively good in ionic conductivity and stability and can be combined with the porous conductive carbon paper current collector specifically; the prepared lithium-air battery has the very excellent cycle performance. Under the condition that the charge and discharge capacity of the battery is kept in 1000mAh / g, and the voltage of the battery is 2.2-5.0V, the open-circuit voltage of the battery is 3V, and the battery can be cycled for thousands of times. The invention also provides a preparation method of the lithium-air battery.

Description

technical field [0001] The invention relates to the field of electrochemical energy, in particular to a lithium-air battery and a preparation method thereof. Background technique [0002] Lithium-air battery is a high-energy battery with high energy density. Compared with the usual lithium-ion battery cathode material, the positive electrode active material of lithium-air battery is oxygen in the air, which is inexhaustible. In the case of excess anode, the termination of the discharge is controlled by the plugging of the air electrode pores by the discharge products. In practical applications, oxygen is provided by the external environment, so the energy density of lithium-air batteries is 1-2 orders of magnitude higher than that of existing lithium battery systems. In addition, lithium-air batteries are a new type of environmentally friendly battery system that can provide clean battery energy for the future. Combining its advantages of low price, safety and environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/08H01M4/66H01M4/48H01M4/62
CPCH01M4/382H01M8/0234H01M8/0245H01M10/0568H01M10/0569H01M12/06H01M2300/0028Y02E60/10Y02E60/50
Inventor 罗仲宽王芳梁春生陈静徐扬海刘东
Owner SHENZHEN UNIV