Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 148, Issue 8, Pages A869-A877Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1382590
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LiNiVO4 is among the transition metal oxides which are candidates as negative electrode materials in lithium-ion batteries. This study describes the cycling behavior of LiNiVO4 Synthesized by a soft chemistry method, X-ray absorption spectroscopy has been used to characterize the structural and electronic modifications induced in the first cycle of a LiNiVO4/Li battery. The experiments were performed at both vanadium and nickel K edges. During the first discharge, the vanadium atoms shift from their pristine tetrahedral sites to distorted octahedra, and a short Ni-Ni distance occurs. During the recharge, the vanadium comes back to a tetrahedral environment. At the same time, the short Ni-Ni distance is always observed, Changes in the edge indicate that both vanadium and nickel are reduced upon lithiation. Vanadium is reduced reversibly at oxidation state two. Nickel reaches a very low oxidation state close to zero and does not recover the pristine oxidation state two upon charging, (C) 2001 The Electrochemical Society.
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