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Lithium Ion Battery Graphite Solid Electrolyte Interphase Revealed by Microscopy and Spectroscopy
Authors
Andersson A. M.
Andersson A. M.
+43 more
Arijit Bose
Armand M.
Aurbach D.
Aurbach D.
Aurbach D.
Aurbach D.
Bodenes L.
Borodin O.
Brazier A.
Brett L. Lucht
Campion C. L.
Connelly N. G.
Daniel P. Abraham
Dinesh Chalasani
Dolle M.
Edström K.
Herstedt M.
Kang S. H.
Kim S.-P.
Leung K.
Li W.
Mengyun Nie
Naji A.
Peled E.
Shi S.
Tasaki K.
Tasaki K.
Vatamanu J.
Verma P.
Wang F.
Wang Y.
Wang Y.
Xiao A.
Xu K.
Xu K.
Xu K.
Xu K.
Yamada Y.
Yanjing Chen
Zhuang G. R.
Zhuang G. V.
Zhuang G. V.
Zhuang G. V.
Publication date
24 January 2013
Publisher
'American Chemical Society (ACS)'
Doi
Cite
Abstract
The surface reactions of electrolytes with the graphitic anode of lithium ion batteries have been investigated. The investigation utilizes two novel techniques, which are enabled by the use of binder-free graphite anodes. The first method, transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy, allows straightforward analysis of the graphite solid electrolyte interphase (SEI). The second method utilizes multi-nuclear magnetic resonance (NMR) spectroscopy of D2O extracts from the cycled anodes. The TEM and NMR data are complemented by XPS and FTIR data, which are routinely used for SEI studies. Cells were cycled with LiPF6 and ethylene carbonate (EC), ethyl methyl carbonate (EMC), and EC/EMC blends. This unique combination of techniques establishes that for EC/LiPF6 electrolytes, the graphite SEI is ∼50 nm thick after the first full lithiation cycle, and predominantly contains lithium ethylene dicarbonate (LEDC) and LiF. In cells containing EMC/LiPF6 electrolytes, the graphite SEI is nonuniform, ∼10-20 nm thick, and contains lithium ethyl carbonate (LEC), lithium methyl carbonate (LMC), and LiF. In cells containing EC/EMC/LiPF6 electrolytes, the graphite SEI is ∼50 nm thick, and predominantly contains LEDC, LMC, and LiF. © 2013 American Chemical Society
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info:doi/10.1021%2Fjp3118055
Last time updated on 03/11/2020
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