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To improve the cycle performance of spinel LiMn,O4as the cathode of 4 V class lithium secondary batteries, the quaternary spinel phases LiM5Mn,,04 (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 were carried out using the LilLiM,Mn29O4 cells. These cathodes were more tolerant to repeated lithium extraction and insertion than a standard LiIVIn,04 spinel electrode in spite of a small reduction in the initial capacity. Considering both cycle life and capacity density, LiCo,,0Mn,,,804 showed good cycle performance with an energy density of 370 Wh kg' at the 300th cycle. The improvement in cycling performance is attributed to the stabilization in the spinel structure by the doped metal cations.

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