LiNi_(0.5)Mn_(1.5)O_4纳米棒的合成及其储锂性能研究

将化学计量比的LiOH·H_2O、Ni(NO_3)_2·6H_2O与超细α-MnO_2纳米线前驱体均匀混合,在800℃下煅烧12 h合成LiNi_(0.5)Mn_(1.5)O_4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-MnO_2纳米线平均直径为10 nm,多根α-MnO_2纳米线聚集成簇。LiNi_(0.5)Mn_(1.5)O_4纳米棒直径为50 nm,与α-MnO_2纳米团簇的直径相仿。电化学测试结果表明:LiNi_(0.5)Mn_(1.5)O_4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%。

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

The LiNi0.5Mn1.5O4 nanorods were synthesized by sintering the stoichiometric mixture of ultrafineα?MnO2 nanowires precursor, LiOH·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 ofα?MnO2 nanowire clusters. The electrochemical performance test exhibits that LiNi0.5 Mn1.5 O4 nanorod has an initial discharge specific energy of 475 Wh/kg and capacity retention of 99% after 500 cycles.