Abstract: 5 V spinel LiNi_0.5Mn_1.5O₄ is one of the most potential cathode materials for lithium-ion batteries because of its advantages of high energy density，low cost，and no pollution to the environment etc.Different carbon sources，such as sucrose，glucose，and citric acid，were adopted respectively as first，and then  LiCr_0.2Ni_0.4Mn_1.4O₄ was prepared by solid mixture，doping chromium，ball milling，and high temperature calcination.Structure，morphology，particle size，particle size distribution，and electrical performance of the samples were analyzed by XRD，EM，particle size measurement and constant current charge-discharge cycling test.Results showed that submicron spinel LiCr_0.2Ni_0.4Mn_1.4O₄ with thinner particle size，narrower size distribution，and better electrical performance was obtained when glucose was added.Specific capacity of LiCr_0.2Ni_0.4Mn_1.4O₄  cathode material was 149 mA·h/g charged at 3.4～5.2 V and 1 C and retained 98 % of the initial capacity after 100 cycles.

Key words: lithium-ion batteries, cathode material, LiCr_0.2Ni_0.4Mn_1.4O₄, high-voltage