Micro-dot array of LiMn2O4 on An substrate was prepared by sol-gel process combined with a micro-injection technology. The size of a dot of LiMn2O4 was 50 mu m, and dot population density on the substrate was 5000 dots cm(-2). Electrochemical properties of micro-dots of LiMn2O4 in a PMMA-gel electrolyte were characterized as cathode for lithium micro-batteries. A micro-dot of LiMn2O4 exhibited a discharge capacity of 1.8 mu C dot(-1), and the capacity fade was only 21% over 200 charge-discharge cycles.