Yttrium doped spinel LiMn2-yYO4 with single phase was synthesized and characterized. The data of the XRD show that the limit for Y solubility is y less than or equal to 0.02. The beneficial effect of Y is evident by way of improved cyclability. The electrode of LiMn1.98Y0.02O4 shows excellent electrochemical properties with a first discharge capacity of 118 mA.h.g(-1) and retaining 98% of the initial capacity after 100 cycles at the current rate 0.2 C.