LiNi0.5Mn1.5O4纳米棒的合成及其储锂性能研究

Synthesis and Li-storage Performances of LiNi0.5Mn1.5O4 Nanorods

将化学计量比的LiOH·H2O、Ni（NO3）2·6H2O与超细α-MnO2纳米线前驱体均匀混合,在800℃下煅烧12 h合成LiNi0.5Mn1.5O4纳米棒。通过XRD、TEM和电化学测试对样品的晶体结构、表面形貌及电化学性能进行了表征。结果表明:超细α-MnO2纳米线平均直径为10 nm,多根α-MnO2纳米线聚集成簇。LiNi0.5Mn1.5O4纳米棒直径为50 nm,与α-MnO2纳米团簇的直径相仿。电化学测试结果表明:LiNi0.5Mn1.5O4纳米棒的初始放电比能量为475 Wh/kg,循环500圈后容量保持率为99%。

The Li Ni0.5Mn1.5O4 nanorods were synthesized by sintering the stoichiometric mixture of ultrafine α-MnO2 nanowires precursor,Li OH · H2O and Ni（NO3）2·6H2O at 800 ℃ for 12 h in air. The crystal structure,surface morphology and electrochemical performance of the product were investigated by XRD, TEM techniques and electrochemical testing. The results reveal that the ultrafine α-MnO2 nanowires have an average diameter of 10 nm,which can be aggregated together into a cluster,while the LiNi0.5Mn1.5O4 nanorod has a diameter about 50 nm,similar to that of α-MnO2 nanowire clusters. The electrochemical performance test exhibits that LiNi0.5Mn1.5O4 nanorod has an initial discharge specific energy of 475 Wh/kg and capacity retention of 99% after 500 cycles.