Polythiophene mesoporous birnessite-MnO2/Pd cathode air electrode for rechargeable Li-air battery

Arjun Kumar Thapa, Bill Pandit, Hem Sharma Paudel, Rajesh Thapa, Shintaro Ida, Jacek B. Jasinski, Gamini U. Sumanasekera, Tatsumi Ishihara

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Mesoporous birnessite-manganese oxide (b-MnO2) was studied for air electrode for Li-air rechargeable battery. In this study, mesoporous b-MnO2 with an average pore size of 3.52 nm and BET surface area of 237 m2 g-1 was successfully prepared using inorganic/organic phase. Prepared mesoporous b-MnO2 was applied for air electrode for Li-air battery and discharge capacity of 345 mAh g -1 was observed at a current of 0.13 mA cm-2. With the dispersion of small amount of Pd to mesoporous b-MnO2, it was found that the Li-air cell showed a reasonably large discharge capacity of 487 mAh g-1 at 0.13 mA cm-2 at the initial cycle. The first discharge plateau around 2.71 V vs. Li/Li+ and charge plateau at 3.58 V vs. Li/Li+ with highly reversible capacity were observed. The energy efficiency for the charge and discharge was estimated to be ca. 76.4%. The ex-situ XRD result of the mesoporous b-MnO2/Pd/TAB-2 (85/5/10) air electrode suggested that the observed capacity mainly came from Li + and O2 to form Li2O2 after discharge to 2.0 V. Formation of Li2CO3 was hardly observed.

Original languageEnglish
Pages (from-to)410-415
Number of pages6
JournalElectrochimica Acta
Volume127
DOIs
Publication statusPublished - May 1 2014

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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