Nanoscale LiFePO4 and Li4Ti5O12 for High Rate Li-Ion Batteries

Abstract

The electrochemical performances of nanoscale and materials are described in this paper. The nanomaterials were synthesized by pyrolysis of an aerosol precursor. Both compositions required moderate heat-treatment to become electrochemically active. nanoparticles were coated with a uniform, 2–4 nm thick carbon coating using an organic precursor in the heat-treatment step and showed a high tap density of despite the 50–100 nm particle size and 2.9 wt % carbon content. nanoparticles were between 50 and 200 nm and showed a tap density of . The nanomaterials were tested both in half-cell configurations against Li metal and in full cells. Nano- showed a high discharge rate capability with values of 150 and 138 mAh/g at C/25 and 5C, respectively, after constant C/25 charges. Nano- also showed a high charge capability with values of 148 and 138 mAh/g at C/25 and 5C, respectively, after constant C/25 discharges; the discharge (lithiation) capability was comparatively slower. full cells deliver charge/discharge capacity values of 150 and 122 mAh/g at C/5 and 5C, respectively.