Investigation of an electrolyte for lithium secondary batteries with lithium-containing manganese dioxide as the positive material

Abstract

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 in lithium secondary batteries. We also have improved the cycle performance of lithium-aluminum alloy for use as a negative electrode material by adding manganese to aluminum. The effect of an electrolyte on battery performance such as cycle life, discharge characteristics at low temperature and storage characteristics, were investigated for CDMO/Li-Al flat cells. LiCF 3SO 3 showed excellent discharge characteristics both at room temperature and −20 °C. In addition, the charge/discharge cycle at room temperature was best when using LiCF 3SO 3-ethylene carbonate (EC)/1,2-butylene carbonate (BC)/1,2-dimethoxyethane (DME), as electrolyte.