Si. Tobishima et al., INFLUENCE OF THE COMPOSITION OF TERNARY MIXED-SOLVENT ELECTROLYTES ONTHE PROPERTIES OF RECHARGEABLE LITHIUM CELLS, Journal of Applied Electrochemistry, 27(8), 1997, pp. 902-907
A cell system consisting of an amorphous (a-)V2O5-P2O5 (95:5 in molar
ratio) cathode, a lithium metal anode and an organic electrolyte by fa
bricating an AA-size prototype cell has been studied. The influence of
the composition of ternary mixed solvent electrolytes comprising ethy
lene carbonate (EC), propylene carbonate (PC) and 2-methyltetrahydrofu
ran (2MeTHF) on the properties of AA-size Li/a-V2O5-P2O5 cells is exam
ined. The goals are to improve the cycle life of the cell while ensuri
ng its safety and controlling its cost. The electrolyte composition is
varied by changing the solvent mixing ratio, and the lithium salt con
centration, and by using different kinds of solute, The cell performan
ce examined includes cathode utilization (cell capacity) during low te
mperature operation, and charge-discharge cycle life. Heating abuse te
sts were also carried out at 130 degrees C on the Li/a-V2O5-P2O5 cells
. The best electrolyte composition was found to be 1.15m LiAsF6-EC/PC/
2MeTHF (15:70:15) from the overall results on cycle life, capacity, sa
fety and cost.