A combined approach for high-performance Li-O2 batteries: A binder-free carbon electrode and atomic layer deposition of RuO2 as an inhibitor-promoter

Hyun Seop Shin, Gi Won Seo, Kyoungwoo Kwon, Kyu Nam Jung, Sang Ick Lee, Eunsoo Choi, Hansung Kim, Jin Ha Hwang, Jong Won Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A rechargeable lithium-oxygen (Li-O2) battery is considered as a promising technology for electrochemical energy storage systems because its theoretical energy density is much higher than those of state-of-the-art Li-ion batteries. The cathode (positive electrode) for Li-O2 batteries is made of carbon and polymeric binders; however, these constituents undergo parasitic decomposition reactions during battery operation, which in turn causes considerable performance degradation. Therefore, the rational design of the cathode is necessary for building robust and high-performance Li-O2 batteries. Here, a binder-free carbon nanotube (CNT) electrode surface-modified by atomic layer deposition (ALD) of dual acting RuO2 as an inhibitor-promoter is proposed for rechargeable Li-O2 batteries. RuO2 nanoparticles formed directly on the binder-free CNT electrode by ALD play a dual role to inhibit carbon decomposition and to promote Li2O2 decomposition. The binder-free RuO2/CNT cathode with the unique architecture shows outstanding electrochemical performance as characterized by small voltage gaps (∼0.9 V) as well as excellent cyclability without any signs of capacity decay over 80 cycles.

Original languageEnglish
Article number047702
JournalAPL Materials
Volume6
Issue number4
DOIs
Publication statusPublished - 2018 Apr 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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