A soluble phenolic mediator contributing to enhanced discharge capacity and low charge overpotential for lithium-oxygen batteries

Wei Yu, Wei Yang, Ruliang Liu, Lei Qin, Yu Lei, Liang Liu, Dengyun Zhai, Baohua Li, Feiyu Kang

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this study, a phenolic antioxidant of 2,6-di-tert-butyl-hydroxytoluene (BHT) is applied in Li-O2 batteries to simultaneously improve discharge capacity and reduce charge overpotential. BHT exhibits a redox couple at ~ 3.0 V (vs. Li+/Li), which is extremely close to the thermodynamic potential of a Li-O2 battery (2.96 V). The unique chemical and electrochemical behaviors of BHT contribute to the improvement on both oxygen reduction reaction and oxygen evolution reaction performances. These factors lead to the notable enhancement of discharge capacity (capacity increases by 72%) and the reduction of charge plateau (the plateau is 3.2 V and 4.2 V, respectively, with and without BHT) for Li-O2 batteries. Furthermore, in-situ X-ray diffraction results confirm that the BHT-mediated formation and decomposition of Li2O2, rather than parasitic reactions, dominate the discharge and charge processes. The results provide a new approach for exploiting appropriate soluble mediators for rechargeable Li-O2 batteries.

Original languageEnglish
Pages (from-to)68-72
Number of pages5
JournalElectrochemistry Communications
Volume79
DOIs
Publication statusPublished - 2017 Jun 1
Externally publishedYes

Keywords

  • Bifunctional mediator
  • In-situ X-ray diffraction
  • Li-O battery
  • Phenolic antioxidant

ASJC Scopus subject areas

  • Electrochemistry

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