Synthesis and characterization of LiMg_yMn_(2-y)O_4 cathode materials by a modified Pechini process for lithium batteries

摘要

Cubic spinels of composition, LiMg_yMn_(2-y)O_4, with y = 0.0,0.05,0.1,0.15, and 0-2, were synthesized by a modified Pechini process using polyethylene glycol and citric acid. The phase formation and/or crystallization of the precursors were studied by thermal analysis. Products were characterized by X-ray diffraction and SEM analysis. Coin cells were fabricated with lithium as the anode and LiMg_yMn_(2-y)O_4 as the cathode in an electrolyte of 1 M LiPF_6 in a 1 : 1 (v/v) mixture of EC and DEC. The charge-discharge studies were performed and the results were compared with materials prepared by a solid state thermal method.