一维纳米LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2纤维的合成及性能研究  

Synthesis and performance study of one-dimensional LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 nanofiber

作　　者：尹壮 周红伟[1] 丁夏楠[1] 晏刚[1] 辛秦[1] 王新东[1] 

机构地区：[1]北京科技大学冶金与生态工程学院冶金物理化学系,北京100083

出　　处：《有色金属科学与工程》2015年第2期32-36,共5页Nonferrous Metals Science and Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB934002);国家高技术研究发展计划(863计划)项目(2012AA053401)

摘　　要：通过静电纺丝法制备出一维纳米Li Ni1/3Co1/3Mn1/3O2纤维,根据扫描电子显微镜（SEM）、X射线衍射（XRD）、充放电实验,循环伏安法和交流阻抗法对纳米纤维的形貌、晶体结构和电化学性能进行研究.结果表明,纳米纤维的直径在150~300 nm之间,且具有典型的α-Na Fe O2层状结构;所制备的Li Ni1/3Co1/3Mn1/3O2纳米纤维在0.5 C（85 m A/g）的倍率下循环30次容量保持率达到了94.1%;在倍率分别为0.1 C、0.2 C、0.5 C、1.0 C、2.0 C和0.2 C的充放电测试中,其比容量分别达到了157 m Ah/g、144 m Ah/g、134 m Ah/g、125 m Ah/g、115 m Ah/g和141 m Ah/g;在CV和EIS测试中,材料表现出优异的可逆性和循环稳定性.由于具有特殊的一维形貌,Li Ni1/3Co1/3Mn1/3O2纳米纤维表现出优异的电化学性能.The one-dimensional Li Ni1/3Co1/3Mn1/3O2 nanofiber is synthesized by electrospinning and characterized by means of scanning electron microscope（SEM）, X-ray diffraction（XRD）, charge and discharge tests, CV and EIS to reveal the surface morphology, crystal structure and electrochemical properties. The results show that the diameter of nanofiber is found to be in the range of 150 ~300 nm, and the typical α-Na Fe O2 structure is certified. The capacity retention ratio of the prepared Li Ni1/3Co1/3Mn1/3O2 nanofiber reaches 94.1 % at the rate of0.5 C（85 m A/g）after 30 cycles. In the rate performance tests, the cathode materials show discharge capacities of157 m Ah/g、144 m Ah/g、134 m Ah/g、125 m Ah/g、115 m Ah/g and 141 m Ah/g at the rates of 0.1 C、0.2 C、0.5 C、1.0 C、2.0 C and 0.2 C, respectively. The prepared material shows outstanding reversibility and cycle stability.The Li Ni1/3Co1/3Mn1/3O2 nanofiber benefitting from its special one-dimensional morphology exhibits excellent electrochemical performance.

关 键 词：锂离子电池 正极材料 LI Ni1/3Co1/3Mn1/3O2 静电纺丝 纳米纤维 

分 类 号：TF111.52[冶金工程—冶金物理化学] TM911[电气工程—电力电子与电力传动]