STUDIES OF SPINEL LICRXMN2-XO4 FOR SECONDARY LITHIUM BATTERY

X-ray and electrochemical studies of spinel-related manganese chromium oxides, LiCrxMn2-xO4 (0 less-than-or-equal-to x less-than-or-equal-to 1) were carried out in a lithium nonaqueous cell. X-ray diffraction s pectra indicated that the substitution of manganese in LiMn2O4 by triv alent transition metals (Cr3+) cause the linear decrease of lattice pa rameter with the x in the LiCrMn2-xO4. Some discharge-capacity loss wa s obtained due to the lattice contraction of LiCrMn2-xO4, but it has a better rechargeability than LiMn2O4. Cyclic voltammetry and electroch emical impedance experiments have shown that the excellent rechargeabi lity of LiCrxMn2-xO4 may be attributed to the good reversibility of th e change in its crystal structure for the insertion and extraction of lithium ions.