In:
Angewandte Chemie, Wiley, Vol. 133, No. 6 ( 2021-02-08), p. 3242-3248
Abstract:
Aprotic Na‐O 2 batteries have attracted growing interest owing to their low overpotentials and high energy density. Their cycling stability and Coulombic efficiency are limited, however, by Na dendrite formation and superoxide (O 2 − ) degradation. Here, we present a bifunctional cation additive, the tetrabutylammonium cation (TBA + ), to simultaneously protect the Na anode and stabilize the superoxide. The adsorption of TBA + on the Na anode suppresses the dendrite formation in the Na plating and ensures stable anode cycling at high current density in both Ar and oxygen atmospheres. Aprotic Na‐O 2 batteries with TBA + show increased Coulombic efficiency as well as good rate capability. These are rewarded by the fast desolvation kinetics of O 2 − and suppression of the disproportionation reaction of O 2 − with TBA + , as confirmed by molecular dynamics simulation and DFT calculations. This bifunctional effect of this cation additive paves a new avenue for the development of Na‐O 2 batteries.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.202012787
Language:
English
Publisher:
Wiley
Publication Date:
2021
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505868-5
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506609-8
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514305-6
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505872-7
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1479266-7
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505867-3
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506259-7
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