物理化学学报2017，Vol.33Issue(8)：1605-1613,9.DOI:10.3866/PKU.WHXB201704145
LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料:增强的库伦效率和循环性能
LiFePO4-Coated Li1.2Mn0.54Ni0.13Co0.13O2 as Cathode Materials with High Coulombic Efficiency and Improved Cyclability for Li-Ion Batteries
摘要
Abstract
In this work,we present a new design for a surface protective layer formed by a facile aqueous solution process in which a nano-amhitectured layer of LiFePO4 is grown on a Li-rich cathode material,Li1.2Mn0.54Ni0.13Co0.13O2.The coated samples are then calcined at 400 or 500 ℃ for 5 h.The sample after calcination at 400 ℃ demonstrates a high initial columbic efficiency of 91.9％,a large reversible capacity of 295.0 mAh·g-1 at 0.1C (1C =300 mA·g-1),and excellent cyclability with a capacity of 206.7 mAh·g-1after 100 cycles at 1C.Meanwhile,voltage fading of the coated sample is effectively suppressed by protection offered by a LiFePO4 coating layer.These superior electrochemical performances are attributed to the coating layer,which not only protects the Li-dch cathode material from side reaction with the electrolyte and maintains the stability of the interface structure,but also provides excess reversible capacity.关键词
锂离子电池/富锂正极材料/磷酸铁锂包覆/高库仑效率/循环性能Key words
Lithium-ion battery/Lithium-rich cathode materials/LiFePO4 coating/High Columbic efficiency/Cyclability分类
化学化工引用本文复制引用
何磊,徐俊敏,王永建,张昌锦..LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料:增强的库伦效率和循环性能[J].物理化学学报,2017,33(8):1605-1613,9.基金项目
The project was supported by the Scientific Research Grant of Hefei Science Center of Chinese Academy of Sciences (2015SRG-HSC025) and National Natural Science Foundation of China (U1532267,11504379).中国科学院合肥科学中心科学研究项目(2015SRG-HSC025)和国家自然科学基金(U1532267,U11504379)资助 （2015SRG-HSC025）
