LiNi0.5Mn1.5O4 was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi0.5Mn1.5O4 synthesized w...LiNi0.5Mn1.5O4 was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi0.5Mn1.5O4 synthesized wi- th Ni(NO3)·26H2O as precursor had good charge-discharge performances. At the potential range of 3.0￣5.0 V, the reversible capacity of the above LiNi0.5Mn1.5O4 could reach to 145 mAh·g-1 and remained 143 mAh·g-1 after 10 cycles, while at 3.0￣4.9 V, there was still 133 mAh·g-1 reversible capacity, and was 125 mAh·g-1 after 40 cycles. XRD results indicated that the synthesized compound was with spinel structure. The precursors and dispersion method had remarkable effect on the structures of the resulting compounds. Pure spinel phase could be obtain- ed with mechanical ball-milled method and Ni(NO3)·26H2O as precursor, and trace amount of NiO phase could be detected in LiNi0.5Mn1.5O4 with simple mixture method and using Ni(CH3COO)2·6H2O, NiO and Ni2O3 as precurs- ors.展开更多
文摘LiNi0.5Mn1.5O4 was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi0.5Mn1.5O4 synthesized wi- th Ni(NO3)·26H2O as precursor had good charge-discharge performances. At the potential range of 3.0￣5.0 V, the reversible capacity of the above LiNi0.5Mn1.5O4 could reach to 145 mAh·g-1 and remained 143 mAh·g-1 after 10 cycles, while at 3.0￣4.9 V, there was still 133 mAh·g-1 reversible capacity, and was 125 mAh·g-1 after 40 cycles. XRD results indicated that the synthesized compound was with spinel structure. The precursors and dispersion method had remarkable effect on the structures of the resulting compounds. Pure spinel phase could be obtain- ed with mechanical ball-milled method and Ni(NO3)·26H2O as precursor, and trace amount of NiO phase could be detected in LiNi0.5Mn1.5O4 with simple mixture method and using Ni(CH3COO)2·6H2O, NiO and Ni2O3 as precurs- ors.
