The high voltage layered Li[Li0.2Mn0.56Ni 0.16Co0.08]O2 cathode material, which is a solid solution between Li2MnO3 and LiMn 0.4Ni0.4Co0.2O2, has been synthesized by co-precipitation method followed by high temperature annealing at 900 °C. XRD and SEM characterizations proved that the as prepared powder is constituted of small and homogenous particles (100-300 nm), which are seen to enhance the material rate capability. After the initial decay, no obvious capacity fading was observed when cycling the material at different rates. Steady-state reversible capacities of 220 mAh g-1 at 0.2C, 190 mAh g-1 at 1C, 155 mAh g-1 at 5C and 110 mAh g-1 at 20C were achieved in long-term cycle tests within the voltage cutoff limits of 2.5 and 4.8 V at 20 °C. © 2011 Elsevier B.V. All rights reserved.
Synthesis and electrochemical performance of the high voltage cathode material Li[Li0.2Mn0.56Ni0.16Co 0.08]O2 with improved rate capability
Li J.;
2011-01-01
Abstract
The high voltage layered Li[Li0.2Mn0.56Ni 0.16Co0.08]O2 cathode material, which is a solid solution between Li2MnO3 and LiMn 0.4Ni0.4Co0.2O2, has been synthesized by co-precipitation method followed by high temperature annealing at 900 °C. XRD and SEM characterizations proved that the as prepared powder is constituted of small and homogenous particles (100-300 nm), which are seen to enhance the material rate capability. After the initial decay, no obvious capacity fading was observed when cycling the material at different rates. Steady-state reversible capacities of 220 mAh g-1 at 0.2C, 190 mAh g-1 at 1C, 155 mAh g-1 at 5C and 110 mAh g-1 at 20C were achieved in long-term cycle tests within the voltage cutoff limits of 2.5 and 4.8 V at 20 °C. © 2011 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
