Preparation, structure and electrochemical properties of spinel Li1−xMn2−yO4 cathode material for lithium ion batteries

Abstract The spinel LiMn 2 O 4 has been synthesized at low temperature from polymeric precursors through Pechini process. In combination with element content determination and valence evaluation, auto-calibration method has firstly been introduced to calculate the amounts of LiMn 2 O 4 with spinel and Mn 2 O 3 with bixbyite in the species, and then metal-deficient nonstoichiometric model of [Li 1− x □ x ] 8a [Mn(III) P Mn(IV) q □ y ] 16d O 4 has been proposed to describe the structure of the prepared sample. Electrical properties of LiMn 2 O 4 have been depicted by charging and discharging curves and cyclic voltammograms. When calcining temperature is at 500°C, vacancy amounts of Li + ion in the defect model is 0.3, that of Mn is 0.1 and capacity of the material is 127.8 mAh g −1 .