Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 21, Pages 9024-9031Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b03266
Keywords
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Funding
- National Sciences and Engineering Research Council of Canada
- Canada Research Chair Program
- Canada Foundation for Innovation
- Ontario Research Fund
- University of Western Ontario
- 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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