Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003789
Keywords
Na dendrites; Na-O-2 batteries; polymeric Na-protection layers; solid-state electrolyte; superoxide crossover
Categories
Funding
- National Sciences and Engineering Research Council of Canada
- Canada Research Chair Program
- Canada Foundation for Innovation
- Ontario Research Fund
- University of Western Ontario
- China Scholarship Council
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This study reveals the impact of superoxide crossover on the polymeric Na protection layer in Na-O-2 batteries and proposes an effective strategy to block superoxide penetration. By utilizing solid-state electrolytes, the performance of Na-O-2 batteries has been significantly improved, leading to extended battery life.
Na-O-2 batteries are attractive for energy storage due to their high theoretical energy density. In order to alleviate Na dendrite formation, artificial protective coatings have been widely investigated in Na-metal batteries (NMBs). Although it can be intuitive to expect transferable Na protection methodologies from NMBs to Na-O-2 batteries, the performance of anode protection coatings in Na-O-2 batteries remains obscure, because Na-O-2 batteries undergo a unique reaction mechanism involving superoxide. Here, the effect of superoxide crossover on the polymeric Na protection layer in Na-O-2 batteries is revealed, and an effective strategy to eliminate the implications of a superoxide-sensitive protecting layer is proposed. Using polymeric alucone protected Na anode as an example, the alucone layer actually decomposes under superoxide attack and is incapable of facilitating long-term cycling of Na-O-2 batteries in sharp contrast to its stable performance in NMBs. By blocking superoxide crossover with solid-state electrolytes (SSEs), significantly improved Na-O-2 cell performance is demonstrated, recovering the Na dendrite suppressing effect of the alucone film. Benefiting from the synergistic effect of SSE and alucone layer, Na-O-2 batteries can achieve a long life of 325 cycles at 0.2 mA cm(-2). This work indicates that the stability of the Na protection layer against superoxide should be taken into serious consideration.
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