کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1287851 1497997 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Identifying lithium–air battery discharge products through 6Li solid-state MAS and 1H–13C solution NMR spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Identifying lithium–air battery discharge products through 6Li solid-state MAS and 1H–13C solution NMR spectroscopy
چکیده انگلیسی

Discharged lithium–O2 battery cathodes are investigated with different catalysts present including Pd, α-MnO2 and CuO, and containing two different electrolyte solvents, 1:1 ethylene carbonate/dimethyl carbonate (EC/DMC) and tetraethylene glycol dimethyl ether (TEGDME). Solid-state 6Li magic angle spinning (MAS) NMR spectroscopy has been used identify lithium products that are formed in the cathodes and differences between products formed with the different catalysts and solvents. There are significant differences in the products formed in Li–O2 cathodes with the two different solvents, EC/DMC and TEGDME. Due to the small chemical shift range of lithium it is difficult to determine exact speciation from 6Li MAS NMR data alone. Fitting of the 6Li NMR peaks with tested Li-oxide powder standards indicates that Li–O2 cathodes discharged in EC/DMC produce primarily Li2CO3 as a lithium product and those discharged in TEGDME produce mainly Li2O2. Solution 2D correlation 1H–13C NMR spectroscopy techniques allow for determination of side-products produced in Li–O2 cathodes.


► 6Li, 13C, and 1H NMR spectroscopy is used to interrogate discharged lithium–O2 battery cathodes.
► 6Li NMR shows Li2O2 is the primary product from batteries with TEGDME solvent.
► Degradation products include lithium formate, lithium acetate, and lithium carbonate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 235, 1 August 2013, Pages 87–94
نویسندگان
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