1. FeF3-coated LiNi0.8Co0.15Al0.05O2 cathode materials with improved electrochemical properties
- Author
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Xian Tang, Jiyong Deng, Wanmin Liu, Guilin Li, Huang Xianwei, and Mulan Qin
- Subjects
Materials science ,Scanning electron microscope ,Mechanical Engineering ,Inorganic chemistry ,02 engineering and technology ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electrochemistry ,01 natural sciences ,Cathode ,Lithium-ion battery ,0104 chemical sciences ,law.invention ,Differential scanning calorimetry ,Coating ,Chemical engineering ,Mechanics of Materials ,law ,engineering ,General Materials Science ,Thermal stability ,Crystallization ,0210 nano-technology - Abstract
The surface of a LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode material is coated by a 10–20 nm thick FeF 3 layer using a solventing-out crystallization process. Scanning electron microscope (SEM) and X-ray diffraction (XRD) results demonstrate that the morphology and structure of LiNi 0.8 Co 0.15 Al 0.05 O 2 are not affected by FeF 3 layer. Electrochemical properties of bare and FeF 3 -coated LiNi 0.8 Co 0.15 Al 0.05 O 2 are investigated at room and high temperatures. Compared with bare LiNi 0.8 Co 0.15 Al 0.05 O 2 , FeF 3 -coated LiNi 0.8 Co 0.15 Al 0.05 O 2 shows higher discharge capacity and capacity retention at different rates at 25 °C, in addition to better cycle performance at 55 °C. Furthermore, differential scanning calorimetry (DSC) analysis shows that the existence of FeF 3 coating helps to enhance the thermal stability of LiNi 0.8 Co 0.15 Al 0.05 O 2 .
- Published
- 2016
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