LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2和LiNi_(3/8)Co_(1/4)Mn_(3/8)O_2纳米纤维的合成与电化学性能

Synthesis and Electrochemical Properties of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 and LiNi_(3/8)Co_(1/4)Mn_(3/8)O_2 Nanofibers

以溶胶前驱体为纺丝液,通过静电纺丝法合成锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2和LiNi3/8Co1/4Mn3/8O2纳米纤维。采用原子力显微镜(AFM)、X射线衍射(XRD)、充放电实验对纳米纤维的形貌、结构和电化学性能进行研究。结果表明,纳米纤维的直径在150～200nm之间,且具有典型的α-NaFeO2层状结构。LiNi1/3Co1/3Mn1/3O2和LiNi3/8Co1/4Mn3/8O2纳米纤维的首次放电容量均超过170mAh·g-1,50次循环后容量保持率在90%以上。

LiNi1/3Col/3Mnl/302 and LiNi3/sCol/4Mn3/sO2 nanofibers as cathode materials for lithium-ion batteries are successfully prepared from sol precursors by using electrospun method. The morphology, crystal structure and electrochemical behaviors are characterized by atomic force microscopy （AFM）, X-ray diffraction （XRD） and charge-discharge experiments. The results show that the nanofibers possessed typical layer-structure and the average diameter is in the range of 150-200 nm. Both the initial discharge capacities of LiNil/3COl/sMn1/3O2 and LiNi3/sCOl/4Mn3/sO2 nanofibers are over 170 mAh·g-1 and the capacity retention rates are over 90% up to 50 cycles.