Abstract
Fe0.5TiOPO4/C composite was used as anode material for LIB and exhibits excellent cycling performance when the electrode is cycled in two different voltage ranges [3.0–1.3V] and [3.0–0.02V] where different insertion mechanisms were involved. A detailed in situ XANES spectroscopy study coupled to the electrochemical analyses, clearly established that the structure of Fe0.5TiOPO4/C electrode materials is preserved when cycled between 3.0 and 1.3V. Furthermore, a formation of new phase at the end of first discharge was evidenced, with a reversible capacity of 100mAhg−1 after 50 cycles at C/5 rate. At highly lithiated states, [3.0–0.02V] voltage range, a reduction-decomposition reaction highlights the Li-insertion/extraction behaviors, and low phase crystallinity is observed during cycling, in addition an excellent rate behavior and a reversible capacity of 250mAhg−1 can still be maintained after 50 cycles at high cycling rate 5C.
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