INVESTIGATION OF AN ELECTROLYTE FOR LITHIUM SECONDARY BATTERIES WITH LITHIUM-CONTAINING MANGANESE-DIOXIDE AS THE POSITIVE MATERIAL

We have already developed lithium-containing manganese dioxide (CDMO, composite dimensional manganese oxide) with excellent rechargeability and high discharge capacity for use as a positive electrode material i n lithium secondary batteries. We also have improved the cycle perform ance of lithium-aluminum alloy for use as a negative electrode materia l by adding manganese to aluminum. The effect of an electrolyte on bat tery performance such as cycle life, discharge characteristics at low temperature and storage characteristics, were investigated for CDMO/Li -Al flat cells. LiCF3SO3 showed excellent discharge characteristics bo th at room temperature and -20-degrees-C. In addition, the charge/disc harge cycle at room temperature was best when using LiCF3SO3-ethylene carbonate (EC)/1,2-butylene carbonate (BC)/1,2-dimethoxyethane (DME), as electrolyte.