Abstract
The characteristics of the 
cathode of a 
battery have been studied by cyclic voltammetry, x‐ray diffraction, and potentiostatic techniques. It was found that the addition of 
to the 
can prevent overcharge of the 
and decrease the imbalance of the charge/discharge states of the positive and negative electrodes, raise the working voltage of the 
cell, and prevent the formation of 
, thereby improving the rechargeability of the 
electrode. The discharge mechanism is also discussed.