کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
188087 | 459652 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fabrication of FePO4 layer coated LiNi1/3Co1/3Mn1/3O2: Towards high-performance cathode materials for lithium ion batteries Fabrication of FePO4 layer coated LiNi1/3Co1/3Mn1/3O2: Towards high-performance cathode materials for lithium ion batteries](/preview/png/188087.png)
The surface of layered LiNi1/3Co1/3Mn1/3O2 was coated with nano-layer FePO4 by co-precipitation method and followed by heat treatment. The prepared samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). FePO4 coated samples exhibited both improved rate and cycle capacity compared with the pristine LiNi1/3Co1/3Mn1/3O2. The capacity retention after 100 cycles increased from 62.0% to 87.7%. The sample coated with 2 wt% FePO4 and treated at 400 °C showed the optimum cyclability. The electrochemical impedance spectroscopy (EIS) results indicated that the FePO4 coating layer significantly suppressed the increase of charge-transfer resistance (Rct). The activation energy of the charge transfer processes at the electrode/electrolyte interface was reduced by FePO4 coating. Differential scanning calorimetry analysis showed the FePO4 coating improved the thermal stability of the cathode material.
FePO4 coated LiNi1/3Co1/3Mn1/3O2 showed an improved cycle and rate capacities. The FePO4 coating layer significantly suppressed the increase of charge-transfer resistance (Rct) upon cycling and reduced the activation energy of the charge transfer processes.Figure optionsDownload as PowerPoint slide
Journal: Electrochimica Acta - Volume 83, 30 November 2012, Pages 253–258