POSITIVE ELECTRODE FOR SECONDARY BATTERY COMPRISING LITHIUM MANGANESE-BASED OXIDE OF HIGH CAPACITY AND SPINEL CRYSTAL STRUCTURE, AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

PURPOSE: Lithium manganese oxide positive electrode is provide to have excellent capacity and cycles properties in 3V region because of lithium manganese oxide dispersed in a positive electrode assembly at the shape of primary particles. CONSTITUTION: Lithium manganese oxide positive electrode comprises lithium manganese oxide with spinel crystal structure in chemical formula 1: Li_(1+x)M_yMn_(2-x-y)O_(4-z)Q_z as positive electrode active material. The lithium manganese oxide has the structure in which primary particles are dispersed in a positive electrode assembly in order to obtain high capacity and excellent cycle properties in 3V region. In chemical formula 1, 0<=x<=0.3, 0<=y<=1, 0<=z<=1, M is one or more selected from Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, and Bi, and Q is one or more selected from N, F, S and Cl.