The synthesis process of LiCo0.3Ni0.7O2 was investigated by FT-IR, mass spectroscopy, elemental analysis SEM, BET, TG/DTA and XRD in this paper. The results re- vealed that lithium and transition metal ions were trapp...The synthesis process of LiCo0.3Ni0.7O2 was investigated by FT-IR, mass spectroscopy, elemental analysis SEM, BET, TG/DTA and XRD in this paper. The results re- vealed that lithium and transition metal ions were trapped homogeneously on an atomic scale throughout the precursor Li2CO3, NiO and CoO are the intermediate products ob- tained after decomposition of the precursor and Li2CO3 un- dergoes direct reactions with NiO and CoO to form LiCo0.3Ni0.7O2. Moreover, the kinetics of formation of LiCo0.3Ni0.7O2 by citrate sol-gel method is faster than the case of the conventional solid-state reaction between lithium car- bonate and corresponding reactants. The single phase of LiCo0.3Ni0.7O2 was synthesized at temperature as low as 550℃. The discharge capacity of LiCo0.3Ni0.7O2 increases from 127 to 185 mAh/g as the calcination temperature in- creasing from 550 to 750℃. After 100 cycles, the discharge capacity of the sample calcined at 750℃ is 155 mAh/g. The electrochemical study shows that the LiCo0.3Ni0.7O2 has high discharge capacity and good cycling behavior for lithium ion batteries.展开更多
基金the EH.D Foundation of China(Grant No.20020610027)
文摘The synthesis process of LiCo0.3Ni0.7O2 was investigated by FT-IR, mass spectroscopy, elemental analysis SEM, BET, TG/DTA and XRD in this paper. The results re- vealed that lithium and transition metal ions were trapped homogeneously on an atomic scale throughout the precursor Li2CO3, NiO and CoO are the intermediate products ob- tained after decomposition of the precursor and Li2CO3 un- dergoes direct reactions with NiO and CoO to form LiCo0.3Ni0.7O2. Moreover, the kinetics of formation of LiCo0.3Ni0.7O2 by citrate sol-gel method is faster than the case of the conventional solid-state reaction between lithium car- bonate and corresponding reactants. The single phase of LiCo0.3Ni0.7O2 was synthesized at temperature as low as 550℃. The discharge capacity of LiCo0.3Ni0.7O2 increases from 127 to 185 mAh/g as the calcination temperature in- creasing from 550 to 750℃. After 100 cycles, the discharge capacity of the sample calcined at 750℃ is 155 mAh/g. The electrochemical study shows that the LiCo0.3Ni0.7O2 has high discharge capacity and good cycling behavior for lithium ion batteries.
