Detection of Electrochemical Reaction Products from the Sodium-Oxygen Cell with Solid-State 23Na NMR Spectroscopy

被引：81

作者：

Reeve, Zoe E. M. ^{[1
]}

Franko, Christopher J. ^{[1
]}

Harris, Kristopher J. ^{[1
]}

Yadegari, Hossein ^{[2
]}

Sun, Xueliang ^{[2
]}

Goward, Gillian R. ^{[1
]}

机构：

[1] McMaster Univ, Dept Chem & Chem Biol, 1280 Main St West, Hamilton, ON L8S 4M1, Canada

[2] Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2017年 / 139卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

LITHIUM-AIR BATTERY; QUADRUPOLAR NUCLEI; DISCHARGE PRODUCTS; NONAQUEOUS LI-O-2; ALKYL-CARBONATE; MAS NMR; SUPEROXIDE; MECHANISM; ELECTRODE; OXIDES;

D O I：

10.1021/jacs.6b11333

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Na-23 MAS NMR spectra of sodium-oxygen (Na-O-2) cathodes reveals a combination of degradation species: newly observed sodium fluoride (NaF) and the expected sodium carbonate (Na2CO3), as well as the desired reaction product sodium peroxide (Na2O2). The initial reaction product, sodium superoxide (NaO2), is not present in a measurable quantity in the Na-23 NMR spectra of the cycled electrodes. The reactivity of solid NaO2 is probed further, and NaF is found to be formed through a reaction between the electrochemically generated NaO2 and the electrode binder, polyvinylidene fluoride (PVDF). The instability of cell components in the presence of desired electrochemical reaction products is clearly problematic and bears further investigation.

引用

页码：595 / 598

页数：4

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