Cobalt and lithium doubly doped spinel LiMn2O4 have been synthesized by a solid state reaction. The effect of Co and Li doped spinel LiMn2O4 was investigated. The undoped and doped spinels were characterised by means of X-ray diffraction (XRD), inductively coupled plasma/atomic emission spectrometer (ICP/AES) and electrochemical test. The results showed that the doped spinel exhibited superior cycling performance than undoped spinel. The capacity retention of graphite/doped spinel full cell was more than 86% after 1000 cycles (2C rate) at room temperature, which maintained 85% after 100 cycles (1C rate) at 55 degrees C. The differential capacity profiles on doped spinel cathode are more fixed than undoped spinel cathode. Compared with undoped spinel, Mn dissolution into electrolyte at 55 degrees C was reduced by 41%, the lattice parameter difference Delta a was reduced by 82% on doped spinel cathode after cycling. The greatly suppressed structural change and manganese dissolution are responsible for the improved cycling performance on cobalt and lithium doubly doped spinel. (C) 2008 Elsevier B.V. All rights reserved.