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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
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A highly efficient Li2O2 oxidation system in Li-O2 batteries.

Yoko Hase1, Juntaro Seki1, Tohru Shiga1

  • 1Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan. y-hase@mosk.tytlabs.co.jp.

Chemical Communications (Cambridge, England)
|August 24, 2016
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Summary

A new indirect charging system for lithium-oxygen (Li-O2) batteries uses a redox mediator to facilitate lithium peroxide (Li2O2) oxidation. This method avoids parasitic reactions and significantly reduces charging time.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-oxygen (Li-O2) batteries offer high theoretical energy density but face challenges in efficient charging.
  • The insulating nature of the discharge product, lithium peroxide (Li2O2), hinders direct electrochemical oxidation during charging.
  • Parasitic reactions during charging can degrade battery components and limit cycle life.

Purpose of the Study:

  • To demonstrate a novel indirect charging system for Li-O2 batteries.
  • To enable the oxidation of electrochemically isolated Li2O2 using a redox mediator.
  • To improve charging efficiency and reduce charging time in Li-O2 batteries.

Main Methods:

  • Utilized 4-methoxy-2,2,6,6-tetramethylpiperidinyl-1-oxyl (MeO-TEMPO) as a redox mediator.
  • Investigated the indirect oxidation mechanism of Li2O2 facilitated by MeO-TEMPO.
  • Evaluated the charging performance and side reactions in the presence of the mediator.

Main Results:

  • Successfully demonstrated an indirect charging system for Li-O2 batteries.
  • MeO-TEMPO enabled the oxidation of Li2O2, overcoming its electrochemical isolation.
  • The indirect charging system suppressed parasitic reactions common in direct electrochemical charging.
  • Reduced charging time was observed compared to conventional methods.

Conclusions:

  • The proposed indirect charging system with MeO-TEMPO is a viable strategy for efficient Li-O2 battery charging.
  • Mediated oxidation of Li2O2 offers a pathway to mitigate degradation and improve the practicality of Li-O2 batteries.
  • This approach holds promise for advancing the development of high-energy-density rechargeable batteries.