Abstract
Degradation mechanism of LiMn2O4 cathode at high cut-off voltage of 4.8 V has been investigated. Electrochemical tests of the cathode show that the rapid capacity loss due to the oxidation of electrolyte and the generation of oxygen species under high voltage operation leads to the increase of electrode resistance. In addition, a thick layer is found on the cathode surface from scanning electron microscope. The thickness of the layer increases with the increment of charge potentials.
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