Abstract
Abstract We reported here on the synthesis, the crystal structure and the study of the structural changes during the electrochemical cycling of layered LiNi 0.1 Mn 0.1 Co 0.8 O 2 positive electrode material. Rietveld refinement analysis shows that this material exhibits almost an ideal α-NaFeO 2 structure with practically no lithium–nickel disorder. The SQUID measurements confirm this structural result and evidenced that this material consists of Ni 2+ , Mn 4+ and Co 3+ ions. Unlike LiNiO 2 and LiCoO 2 conventional electrode materials, there was no structural modification upon lithium removal in the whole 0.42 ≤ x ≤1.0 studied composition range. The peaks revealed in the incremental capacity curve were attributed to the successive oxidation of Ni 2+ and Co 3+ while Mn 4+ remains electrochemically inactive.
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