4.8 Article

O2/O2- Crossover- and Dendrite-Free Hybrid Solid-State Na-O2 Batteries

Journal

CHEMISTRY OF MATERIALS
Volume 31, Issue 21, Pages 9024-9031

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b03266

Keywords

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Funding

  1. National Sciences and Engineering Research Council of Canada
  2. Canada Research Chair Program
  3. Canada Foundation for Innovation
  4. Ontario Research Fund
  5. University of Western Ontario
  6. Chinese Scholarship Council

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Superoxide-based Na-O-2 batteries have attracted extensive research attention because of their high theoretical energy density and energy efficiency. However, the poor cycling performance caused by O-2/O-2(-) crossover and the uncontrollable Na dendrite growth severely hinder their practical applications. Addressing these issues comprehensively, we successfully developed a hybrid solid-state (HSS) Na-O-2 battery based on solid-state electrolyte (SSE) and a protected Na anode. The dense structure of SSE effectively suppressed the O-2/O-2(-) crossover, thus mitigating the Na degradation and improving the cell reversibility. Solid electrolyte interphase formation on the Na anode in relation to the O-2/O-2(-) crossover was further revealed. Additionally, a three-dimensional protection layer on the Na anode facilitated uniform Na deposition within the conductive matrix. Consequently, the fabricated HSS Na-O-2 battery demonstrated stable cycling for over 160 cycles at 0.2 mA cm(-2) under the shallow cycling mode. Our results evidently emphasized the critical role of Na anode protection and the importance of O-2/O-2(-) blockage for safe and high-performance Na-O-2 batteries.

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