LiMe1/6Ni2/6Mn9/6O4(Me=Cr, Fe, Co, Ni, Cu, Zn) were prepared and tested as 5V cathode materials. When using Ti mesh current collector, these cathode materials did not exhibit a good performance, due to a corrosion of Ti mesh current collector. On the other hand, the LiMe1/6Ni2/6Mn9/6O4 materials showed the excellent rechargeability and relatively high discharge capacity when using Al current collector. The discharge capacity and rechargeability of LiMe1/6Ni2/6Mn9/6O4 strongly depended on the kind of the substituted ions. The best performance was obtained when a part of Mn ions in LiMn2O4 crystal was substituted by Ni ions (LiNi0.5Mn1.5O4). The discharge capacity was more than 130 mA h g-1 and the rechargeability was 100%. The coulombic efficiency was about 97 %. The average discharge potential was 4.75 V vs. Li/Li+.