Cycling behavior of oxysulfide spinel LiCr_0.19Mn_1.81O_3.98S_0.02 cathode material which shows no capacity loss in the 3-V region

摘要

A new oxysulfide spinel LiCr_0.19Mn_0.81O_3.98S_0.02 with well-developed octahedral stucture is synthesized by a sol-gel method using glycolic acid as a chelating agent. The LiCr_0.19Mn_1.81O_3.98O_0.02 electrode shows no capacity loss in the 3- and 4-V region. This behavior is investigated by X-ray diffraction (XRD). The substitution of S for O in LiMn_2O_4 stabilizes the structural integrity of the spinel host, which in turn increases the electrochemical cycleability.