A porous carbon sheet coated with an oxidation-reduction mediator for use as the positive electrode of an air battery having a lithium metal negative electrode, a positive electrode for an air battery having a lithium metal negative electrode, an air battery having a lithium metal negative electrode, and a method for manufacturing a porous carbon sheet coated with an oxidation-reduction mediator for use as the positive electrode of an air battery having a lithium metal negative electrode.

A porous carbon sheet coated with an oxidation-reduction mediator addresses the high charging overvoltage issue in lithium-air batteries by mediating the oxidative decomposition of lithium peroxide, enhancing battery performance.

JP7883258B2Active Publication Date: 2026-07-01NAT INST FOR MATERIALS SCI +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NAT INST FOR MATERIALS SCI
Filing Date
2022-06-23
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Lithium-air batteries face issues with high charging overvoltage due to the decomposition of lithium peroxide, leading to electrolyte and electrode deterioration, and existing methods to suppress this, such as using a redox mediator in the electrolyte, are ineffective due to the shuttle effect.

Method used

A porous carbon sheet coated with a specific amount of oxidation-reduction mediator is used as the positive electrode, where the mediator is fixed to the surface and inside voids, mediating the oxidative decomposition of lithium peroxide through its own redox reaction, thereby suppressing charging overvoltage.

Benefits of technology

The solution effectively suppresses charging overvoltage while maintaining a large cycle capacity, improving the battery's capacity retention and discharge characteristics.

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Patent Text Reader

Abstract

To provide a redox mediator coated porous carbon sheet that can effectively suppress charging overvoltage while increasing the cycle capacity of an air battery, a positive electrode for an air battery, an air battery, and a method for manufacturing the redox mediator coated porous carbon sheet.SOLUTION: In a redox mediator coated porous carbon sheet according to an embodiment of the present invention, a redox mediator that mediates the oxidative decomposition of a metal oxide through its own redox reaction is fixed to the surface of the porous carbon sheet, and the fixed amount of the redox mediator is 0.2 mg / cm2 or more and less than 2.9 mg / cm2.SELECTED DRAWING: Figure 5
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