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Nanini-Maury, Elise; Światowska, Jolanta; Chagnes, Alexandre; Zanna, Sandrine; Tran-Van, Pierre; Marcus, Philippe; Cassir, Michel
Electrochimica acta, 01/2014, Letnik: 115Journal Article
The electrochemical behavior of new high potential electrolyte containing sebaconitrile in LiPF6/EC:DMC or LiBF4 was studied on glassy carbon and LiCoO2, LiCoPO4 as positive electrode materials. The increase of sebaconitrile concentration in EC:DMC electrolyte provides better electrolyte stability at higher potentials on glassy carbon as observed by cyclic voltammetry. Promising electrochemical results showing good reversibility and insertion/deinsertion efficiency have been also obtained on LiCoPO4 electrode cycled up to 5.3V vs Li+/Li as upper potential limit. However, the cycling of LiCoPO4 at higher potential (6V vs Li+/Li) shows lower reversibility and efficiency of insertion/deinsertion process due to the oxidative decomposition of the electrolyte at high potentials. The surface analysis performed by X-ray photoelectron spectroscopy confirms the formation of a surface layer induced by electrolyte degradation on both types of positive electrodes, which hinder the Li diffusion. The layer composition and morphology vary as a function of electrolyte composition and type of electrode.
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