LITHIUM MANGANESE-BASED OXIDE AND POSITIVE ELECTRODE ACTIVE SUBSTANCE COMPRISING SAME

摘要

The present invention provides a lithium manganese-based oxide having Mn as an essential transition metal and a layered crystalline structure, wherein Mn is higher in content than another transition metal (or other transition metals), the lithium manganese-based oxide has a flat level section characteristic in which oxygen is released together with lithium deintercalation during the initial charging process in a high voltage range of 4.4V or higher, and a pillar element is substituted or doped in a transition metal layer and/or oxide layer including Mn.