A Vanadium-Based Cathode for Lithium-Ion Batteries

A vanadium‐based oxide system has been developed as a cathode for use in a lithium‐ion battery. The lithiated material was made in two steps, i.e., 1, making a Li‐V‐O and, 2, introducing lithium into the intercalation host by reducing the V(V) with ions in the form of lithium sulfide. The stoichiometry of the final product corresponds approximately to . This material has shown excellent resistance to dissolution in ethylene carbonate/dimethyl carbonate electrolyte. The capacity of the material cycling at a C/3 rate over the voltage range of 3.8–2.0 V is ∼220 mAh/g. has demonstrated some stability in an ambient environment. This new cathode is capable of storing large amounts of energy, 630 mWh/g. has exhibited long cycle life, greater than 100 deep discharge cycles vs. lithium metal. © 2000 The Electrochemical Society. All rights reserved.