Prevention of side reactions with a unique carbon-free catalyst biosynthesized by a virus template for non-aqueous and quasi-solid-state Li–O2 batteries

Sara Pakseresht*, Ahmed Waleed Majeed Al-Ogaili, Tugrul Cetinkaya, Mustafa Celik, Hatem Akbulut

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The rational architecture and composition of electrocatalysts are crucial factors for highly efficient lithium-oxygen (Li–O2) systems. In this study, one-dimensional MnO2 polymorphisms (α-, δ-, γ-MnO2) and a hybrid nanostructure composed of α-MnO2 nanowires and Ru nanoparticles are designed through a bio-templated method. Their electrochemical properties are assessed as efficient electrocatalysts for a non-aqueous Li–O2 cell. The virus-templated α-MnO2, δ-MnO2, and γ-MnO2 nanowires in combination with carbon additives indicate specific capacities of 10,875 mAh g−1, 9726 mAh g−1, and 6575 mAh g−1, respectively. However, the presence of carbon inhibits the reversible reaction during cycling performance due to the formation of Li2CO3. Therefore, the incorporation of Ru nanoparticles on the surface of virus-templated α-MnO2 nanowires is studied as an efficient carbon-free cathode material. Notably, the virus-templated Ru/α-MnO2 hybrid electrode is delivered a high specific capacity of 14,383 mAh g−1 with the stability of 48 cycles at a fixed capacity of 1000 mAh g−1. Meanwhile, lithium corrosion and electrolyte decomposition are observed during cycling, which restricts the life cycle of the cell. Therefore, a quasi-solid-state Li–O2 cell is also fabricated by designing an integrated gel polymer electrolyte/cathode, and remarkably the Li–O2 cell shows cycling up to 95 cycles.
Original languageEnglish
Article number230374
JournalJournal of Power Sources
Volume509
DOIs
Publication statusPublished - 15 Oct 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Lithium-oxygen battery
  • M13 bacteriophage
  • Bio-templating
  • MnO2 polymorphisms
  • Catalysts

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