高校化学工程学报2017，Vol.31Issue(3)：693-700,8.DOI:10.3969/j.issn.1003-9015.2017.03.026
FeF3表面包覆Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的制备和电化学性能
Preparation and Electrochemical Characterization of FeF3-Coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 Cathode Materials
摘要
Abstract
FeF3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode materials were synthesized via a wet chemical process followed by solid state reaction. The physical properties of the prepared samples were analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results indicate that the surface of cathode particles was covered by FeF3 film (about 5~20 nm thick). The FeF3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode delivers higher coulombic efficiency, better rate capability and longer cycle life when compared with raw cathode. A high capacity retention of 94.2% (190.6 mAh·g-1) after 100 cycles at 0.5C rate is obtained by the FeF3-coated Li [Li0.2Mn0.54Ni0.13Co0.13] O2 cathode. In addition, the electrochemical impedance spectra reveal that the enhanced electrochemical properties of the surface-modified samples are due to the presence of FeF3 coating layer, which can suppress side reaction between the Li[Li0.2Mn0.54Ni0.13Co0.13]O2 particles and electrolytes, and further stabilize Li[Li0.2Mn0.54Ni0.13Co0.13]O2 structure.关键词
富锂锰基正极材料/三氟化铁/表面包覆/电化学性能Key words
Li-excess Mn-based cathode materials/iron trifluoride/surface coating/electrochemical property分类
信息技术与安全科学引用本文复制引用
李成冬,徐进,李举,夏基胜,刘玮..FeF3表面包覆Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的制备和电化学性能[J].高校化学工程学报,2017,31(3):693-700,8.基金项目
国家自然科学基金资助项目(51405419) （51405419）
江苏沿海新能源汽车研究院重点资助项目(YJY201603). （YJY201603）
