Exploratory Development of an Electrically Rechargeable Lithium Battery.
Final rept. 2 Jul 79-1 Jul 80,
EIC LABS INC NEWTON MA
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The cathodic behavior or V6013 was investigated in rechargeable Li cells of the type, Li2Me-THF,LiAsF6V6013,C. Two forms of V6013 were synthesized and characterized. These were a stoichiometric form, i.e., V02.17, and a slightly non-stoichiometric form, i.e., V02.19. Stoichiometric V6013 was prepared by heating requisite quantities of V205 and V powder for 24 hrs. at 650 C. The slightly non-stoichiometric V6013 was prepared by the thermal decomposition of NH4V03 at 450 C. The discharge characteristics of the stoichiometric oxide at 60 C were similar to that of non-stoichiometric oxide at room temperature. The rechargeability of both the oxides were found to be sensitive to the lower voltage cutoff. The safest limits of cycling were 3.0 and 1.9V. Potentiostatic discharges of the oxides between 1.9 and 1.3V revealed a high capacity irreversible reduction process at about 1.6V. Three types of hermetically sealed cells were constructed and tested. In a high capacity 5Ah prismatic cell utilizing the non-stoichiometric oxide, energy densities of 106 Whrkg and 190 WhrDM3 were achieved.
- Electrochemical Energy Storage