Abstract
Lithiation characteristics of a complex oxide containing V(V) and Cu(II), Cu 5V 2O 10, were investigated. Lithiation was carried out chemically using an n-BuLi/hexane solution. The valence states of copper and vanadium and the structural changes upon lithiation were analyzed using esr, XRD and ir measurements. It was revealed that reduction processes occurred consecutively with an increasing extent of lithiation, x = Li/(5 Cu + 2 V). Up to x = 3, preferential reduction of Cu(II) to Cu(I) occurred in the single phase. At 3 < x, Cu(II) was reduced to Cu(O) and Cu(II) (LiCuVO 4) in the multiphase system. Above about x = 6, LiCuVO 4 was further reduced to metallic copper. The open-circuit potentials of lithiated Cu 5V 2O 10 decreased with x gradually at 0 < x < 3, and has a plateau at x > 3.
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