Electrochemical intercalation of lithium in ternary metal molybdates MMoO_4 (M = Cu, Zn)

摘要

Ternary oxides with general formula MMoO_4 (where M is a 3d-transitional metal) were characterized as cathode materials for lithium rechargeable batteries by galvanostatic charge-discharge technique and cyclic voltammetry. The significant capacity fading after the first cycle of lithium insertion/removal takes place for different copper molybdates (standard α-CuMoO_4 and high-pressure modification CuMoO_4-III) corresponding to the irreversible copper reduction and formation of Li_2MoO_4 during the first discharge. X-ray powder diffraction data reveal the decomposition of pristine ZnMoO_4 by electrochemical reaction, lithium zink oxide with the NaCl-type structure and Li_2MoO_3 seem to be formed.