LiMn1.95M0.05O4 (M : Al, Co, Fe, Ni, Y) cathode materials prepared by combustion synthesis

Spinel LiMn1.95M0.05O4 (M: Al, Co, Fe, Ni, or Y) is prepared by a combustio n synthesis, which is a simple, rapid and cost-effective process for obtain ing oxide powders. The spinel is obtained by combustion of lithium hydroxid e, manganese nitrate. M-nitrates, and urea at about 280 degreesC for 1 min. Well-defined spinel LiMn1.95M0.05O4 was obtained by further heat-treatment at 800 degreesC for 10 h. The synthesized LiMn1.95M0.05O4 shows lower init ial capacities, viz. 90-132 mAh/g than undoped LiMn2O4. The latter has an i nitial capacity of 146 mAh/g which fades to 100 mAh/g with cycling. On the other hand, LiMn1.95Co0.05O4, LiMn1.95Ni0.05O4, and LiMn1.95Y0.05O4 display better cycleability than LiMn2O4. (C) 2001 Elsevier Science B.V. All right s reserved.