不同原料对Li-Ni-Mn-O 5 V正极材料的结构和性能的影响

LiNi_0.5Mn_1.5O₄ was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi_0.5Mn_1.5O₄ synthesized with Ni(NO₃)₂·6H₂O as precursor had good charge-discharge performances. At the potential range of 3.0～5.0 V, the reversible capacity of the above LiNi_0.5Mn_1.5O₄ 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 obtained with mechanical ball-milled method and Ni(NO₃)₂·6H₂O as precursor, and trace amount of NiO phase could be detected in LiNi_0.5Mn_1.5O₄ with simple mixture method and using Ni(CH₃COO)₂·6H₂O, NiO and Ni₂O₃ as precurs-ors.

Effect of Precursors on Structure and Performance of 5 V Li-Ni-Mn-O Cathode Materials