Robust NaO2 Electrochemistry in Aprotic Na-O2 Batteries Employing Ethereal Electrolytes with a Protic Additive

被引:33
作者
Abate, Iwnetim I. [1 ]
Thompson, Leslie E. [1 ]
Kim, Ho-Cheol [1 ]
Aetukuri, Nagaphani B. [1 ]
机构
[1] IBM Res Almaden, 650 Harry Rd, San Jose, CA 95120 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2016年 / 7卷 / 12期
关键词
NONAQUEOUS LI-O-2; SODIUM SUPEROXIDE;
D O I
10.1021/acs.jpclett.6b00856
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Aprotic metal-oxygen batteries, such as Li-O-2 and Na-O-2 batteries, are of topical research interest as high specific energy alternatives to state-of-the-art Li-ion batteries. In particular, Na-O-2 batteries with NaO2 as the discharge product offer higher practical specific energy with better rechargeability and round-trip energy efficiency when compared to Li-O-2 batteries. In this work, we show that the electrochemical deposition and dissolution of NaO2 in Na-O-2 batteries is unperturbed by trace water impurities in Na-O-2 battery electrolytes, which is desirable for practical battery applications. We find no evidence for the formation of other discharge products such as Na2O2 center dot H2O. Furthermore, the electrochemical efficiency during charge remains near ideal in the presence of trace water in electrolytes. Although sodium anodes react with trace water leading to the formation of a high-impedance solid electrolyte interphase, the increase in discharge overpotential is only similar to 100 mV when compared to cells employing nominally anhydrous electrolytes.
引用
收藏
页码:2164 / 2169
页数:6
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