Abstract: The LiMn2O4 and its Cr-doped cathode material LiCr0.1Mn1.9O4 were synthesized by ionothermal method，using bis-（1-hydroxyethyl） ammonium acetate as the reaction mediums at an atmospheric pressure and a low temperature with Cr2（SO4）3，LiOH·H2O，and MnO2 as sources，and followed by heat treatment.The materials were characterized by X-ray diffraction，scanning electron microscopy，and electrochemical test，respectively.The SEM result indicated that the LiMn2O4 and LiCr0.1Mn1.9O4 materials had rod-like structure with the length of about 1.2 μm and the diameter of about 200 nm.The galvanostatic charge-discharge tests demonstrated that a small amount of Cr could effectively improve the electrochemical performance of the materials，and LiCr0.1Mn1.9O4 material had an initial discharge specific capacity of 123.6 mA·h/g at 0.1 C.Furthermore，the discharge capacities of LiCr0.1Mn1.9O4 sample faded slowly before 10 cycles and then remained unchanged in following 50 cycles.

Key words: LiMn2O4, Cr-doping, electrochemical performance, ionothermal systhesis