Synthesis and electrochemical characteristics of oxysulfide spinel material for lithium secondary batteries

Oxysulfide spinel LiMn2O3.98S0.02 powders with monodispersed, and highly ho mogeneous particles were synthesized by a sol-gel method using an aqueous s olution of metal acetates and sulfide containing glycolic acid as a chelati ng agent. The oxysulfide spinel, LiMn2O3.98S0.02 electrode initially delive rs 80 mAh g(-1), steadily increases during cycling, and reaches 99 mAh g(-1 ) at the 20th cycle. The substitution of a small amount S for O in LiMn2O4 spinel helps to maintain structural integrity during cycling, which then ov ercomes the Jahn-Teller distortion in the spinel Mn phase in the 3 V region . (C) 1999 Elsevier Science S.A. All rights reserved.