Abstract: The high-density spherical precursor MnCO₃ was prepared by controlling the reaction conditions.
Furthermore, the spinel LiMn₂O₄ was obtained from the precursor, which was obtained by pre-heat treatment. The product spinel LiMn₂O₄ has high density of more than 1.8g·cm^-3 and high electrochemical
activity with initial discharge capacity of 125mAh·g^-1. The body-doped spinel LiMnO can be obtained by preparing doped precursor MnCO₃ and the
surface-doped spinel LiMnO can be obtained by coating Mn₂O₃. Both of the methods can improve the cycling performance and high temperature
performance obviously with initial discharge capacity little lowering. Compared with body-doping, surface-doping can restrain the
capacity fading more effectively. It still preserves 109mAh/g after 100 cycles at room temperature, the capacity retention is 92.4%. At high
temperature of 55℃, it has 95mAh/g after 50 cycles and capacity retention of 82.6%.

Key words: spinel LiMn₂O₄, body-doping, surface-doping