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
文摘研究应用于锂二次电池阴极的新型高能量密度存贮材料 L i( Alx Co1- x) O2 的充放电特性 ,并与相同条件下制备的传统材料 L i Co O2 进行对比 .结果表明 ,70 0℃烧结的Li( Al0 .3 Co0 .7) O2 有较好的充放电平台 ,电化学容量大于同样条件下制备的 Li Co O2 .
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.
