Synthesis and Electrochemical Performance of LixMn2-yCoyO4-dCld Cathode Material
U.S. Army Communications-Electronics Research, Development and Engineering Center Aberdeen Proving Grounds United States
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Lithium manganese oxide spinel is a potential candidate for Li-ion battery cathodes because of its low toxicity, comparable capacity, and low cost. However, this spinel suffers from capacity fading due to fracturing of the cell structure. Historically, cycle life enhancements of spinels have been achieved through transition metal doping on the B site of the lattice. In this effort, dopants of interest include compounds containing Group VIII Row 4 Fe, Co, and Ni elements, cobalt in particular. In addition to fabrication method variants of this material, the electrochemical performance and cycle life data of the Co B site and Cl O site manganese-based AB2O4 spinel is presented in this paper. Lithium electrochemical cells with Co B and Cl O site doping of a Mn-based AB2O4 spinel cathode have demonstrated the following 1 full reversibility between 4.5 V and 2.0 V, 2 low chargedischarge overpotential between 4.5 V and 3.5 V, 3 high specific capacity of 240 mAhg of active material, and 4 high rate charge and discharge.