Beyond the limited lithium storage capability of the (PO4)(3-)-based compound, LiFePO4 (170 mAh/g), which is currently recognized as the most promising lithium battery cathode for large-scale application, a compound with the lightest small triangle oxyanion unit (BO3)(3-), namely LiFeBO3, exhibits a much larger reversible capacity of ca. 200 mAh/g with surprisingly small volume change of ca. 2%.