Understanding the Nature of Low‐Potential Li Uptake into High Volumetric Capacity Molybdenum Oxides

A simple method to prepare provides a material that displays very good properties as negative electrodes in lithium‐ion batteries. Low‐potential insertion below is associated with dramatic transformation of the initial structure, leading to an amorphous material which exhibits excellent cyclability with a high reversible specific capacity of in the voltage window of . For the first time, two complementary tools, nuclear magnetic resonance and X‐ray absorption spectroscopy, demonstrate that on insertion at low potential, a complex amorphous composite is formed consisting of a in intimate contact with lithium oxide. ©1998 The Electrochemical Society