Electrochemical performance of Sr 0.85Ce 0.15CoO 3- and carbon co-coated LiFePO 4

Abstract

Carbon coated LiFePO 4 was modified with Sr 0.85Ce 0.15CoO 3- via a suspension mixing process followed by heat treatment. An integrate network formed by Sr 0.85Ce 0.15CoO 3- and carbon was found on the surface of LiFePO 4 particles by high resolution transmission electron microscopy. The co-coating layers alleviated the charge-transfer impedance and facilitated the lithium-ion diffusion. Consequently, the discharge capacity was significantly improved especially at high rates. The sample coated with 3 wt Sr 0.85Ce 0.15CoO 3- showed a high capacity of 94 mAh g -1 compared with that of uncoated sample (65 mAh g -1) at 5C. © 2011 The Electrochemical Society.