The Spinel Phases LiM y Mn2 − y O 4 (M = Co, Cr, Ni) as the Cathode for Rechargeable Lithium Batteries

摘要: To improve the cycle performance of spinel LiMn{sub 2}O{sub 4} as cathode 4 V class lithium secondary batteries, quaternary phases LiM{sub y}Mn{sub 2{minus}y}O{sub (M = Co, Cr, Ni; y 1/12, 1/9, 1/6, 1/3) were prepared at 750 C in air. X-ray diffraction and electrochemical studies carried out using Li{vert_bar}Li{sub x}M{sub cells. These cathodes more tolerant to repeated extraction insertion than a standard electrode spite small reduction initial capacity. Considering both life capacity density, LiCo{sub 1/6}Mn{sub 11/6}O{sub showed good with an energy density 370 Wh/kg 300th cycle. The improvement cycling is attributed stabilization structure by doped metal cations.