Zhu Z, Shi X, Zhu D, Wang L, Lei K, Li F. A Hybrid Na//K
+-Containing Electrolyte//O
2 Battery with High Rechargeability and Cycle Stability.
RESEARCH 2019;
2019:6180615. [PMID:
31549072 PMCID:
PMC6750056 DOI:
10.34133/2019/6180615]
[Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 12/23/2018] [Indexed: 11/06/2022]
Abstract
Na-O2 and K-O2 batteries have attracted extensive attention in recent years. However, the parasitic reactions involving the discharge product of NaO2 or K anode with electrolytes and the severe Na or K dendrites plague their rechargeability and cycle stability. Herein, we report a hybrid Na//K+-containing electrolyte//O2 battery consisting of a Na anode, 1.0 M of potassium triflate in diglyme, and a porous carbon cathode. Upon discharging, KO2 is preferentially produced via oxygen reduction in the cathode with Na+ stripped from the Na anode, and reversely, the KO2 is electrochemically decomposed with Na+ plated back onto the anode. The new reaction pathway can circumvent the parasitic reactions involving instable NaO2 and active K anode, and alternatively, the good stability and conductivity of KO2 and stable Na stripping/plating in the presence of K+ enable the hybrid battery to exhibit an average discharge/charge voltage gap of 0.15 V, high Coulombic efficiency of >96%, and superior cycling stability of 120 cycles. This will pave a new pathway to promote metal-air batteries.
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