Abstract
The effect of partial substitution of magnesium on the electrochemical property of LiMn2O4 has been investigated. As a result of magnesium doping, the specific surface area decreased. In addition the lattice constant decreased along with the polarization at a high discharge rate and an excellent cycle performance was realized in exchange for somewhat of reduction of the capacity. The voltage jump of 4.1V for the discharge curve of LiMn2O4 became indistinct with the magnesium doping. The reaction of LiMn1.8SMg0.2O4 during lithium insertion and desertion was a homogeneous phase reaction. Electrochemical measurements revealed that LiMn1-xMgxO4 is a cathode active material appropriate for use at high rates. The optimum x value in LiMn1-x MgxO4 was found to be in the range of about 0.1 to 0.2.
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