The structure and electrochemical performance of LiFeBO3 as a novel Li-battery cathode material

LiFeBO3 cathode material has been synthesized successfully by solid-state reaction using Li2CO3, H3BO3 and FeC2O4.2H(2)O as starting materials. The crystal structure has been determined by the X-ray diffraction. Electrochemical tests show that an initial discharge capacity of about 125.8 mAh/g can be obtained at the discharge current density of 5 mA/g. When the discharge Current density is increased to 50 mA/g, the specific capacity of 88.6 mAh/g can still be held. In order to further improve the electrochemical properties, the carbon-coated LiFeBO3, C-LiFeBO3, are also prepared. The amount of carbon coated on LiFeBO3 particles was determined to be around 5% by TG analysis. In comparison with the pure LiFeBO3, a higher discharge capacity, 158.3 mAh/g at 5 mA/g and 122.9 mAh/g at 50 mA/g, was obtained for C-LiFeBO3. Based on its low cost and reasonable electrochemical properties obtained in this work, LiFeBO3 may he,in attractive cathode Cor lithium-ion batteries. (c) 2007 Elsevier Ltd. All rights reserved.