Ž.Transition metal vanadates, Me VO P 2H O, where Me s Co, Ni, and Mn and 1.0 -x -2.0, were found to reversibly insertlithium. The efficiency of reversible insertion depended on both the transition metal present and the stoichiometric ratio of Me:V in the vanadate structure. The Ni and Co vanadates gave the highest specific capacities using lithium metal coin cells, with initial specific Ž. capacities above 0.7 A hrg 1.0 W hrg when x is near 1.0. The operating voltage of these materials was in the range of 1.0 to 2.0 V. Lithium ion coin cells using LiCoO coupled with the vanadates, were also examined. These were found to deliver about 200 mA hrg, 2 with average voltages of 2.5 to 2.0 V for values of x from 1.1 to 1.2. q 1999 Elsevier Science S.A. All rights reserved.

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A pmtotype l i t h i u m sul-dioxide battery,