Abstract: To extend the charge/discharge voltage range of cathode material Li_xMn₂O₄ for Li-ion battery and
elevate it’s capacity on the basis of good cyclability, the synthesis and electrochemical performance of S-Co co-doped LiMn₂O₄ were researched.
All the samples synthesized by the sol-gel method possess the structure of the pure cubic spinel phase and the crystallization is superior. The electrochemical performance of
LiCo_0.1Mn_1.9O_4-xS__x is satisfying too. In voltage range of 2.4--4.3V, the initial capacity amounts to 170 mAh/g and it increases
to some extent instead of decreasing after 30 cycles.

Key words: Li-ion battery, cathode materials, LiMn₂O₄, S-Co co-dopant