Pitch carbon and LiF co-modified Si-based anode material for lithium ion batteries |
| |
| Affiliation: | 1. Pacific Northwest National Laboratory, 902 Battelle Blvd., Richland, WA, 99352, United States;2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, United States;1. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211816, China;2. Aviation Key Laboratory of Science and Technology on Materials and Application Research for Vibration and Noise Reduction, Beijing Institute of Aeronautical Materials, Beijing 100095, China;3. Department of Materials Physics, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing, Jiangsu 210044, China;1. The Pennsylvania State University, Department of Mechanical and Nuclear Engineering, University Park, PA, 16802, USA;2. Ulsan National Institute of Science and Technology (UNIST), School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan, 689-798, South Korea;3. University of California, Los Angeles (UCLA), Mechanical and Aerospace Engineering Department, Los Angeles, CA, 90095, USA |
| |
| Abstract: | To improve the electrochemical performance of silicon-based anode material, lithium fluoride (LiF) and pitch carbon were introduced to co-modify a silicon/graphite composite (SG), in which the graphite acts as a dispersion matrix. The pitch carbon helps to improve the electronic conductivity and lithium ion transport of the material. LiF is one of the main components of the solid electrolyte interphase (SEI) formed on the silicon surface, helping to tolerate the large volume changes of Si during lithiation/delithiation. The modified SG sample delivered a capacity of over 500 mA h g−1, whereas unmodified SG delivered a capacity of lower than 50 mAh g−1 after 100 cycles at 100 mA g−1. When performed at 4 A g−1, the reversible capacity of the modified SG was 346 mAh g−1, much higher than that of SG (only 37 mA h g−1). The enhanced cycling and rate properties of the modified SG can be attributed to the synergetic contribution of the pitch carbon and LiF which help accommodate the volume change, reduce the side reaction, and form a stable solid electrolyte interface layer. |
| |
| Keywords: | Lithium ion batteries Silicon anode Lithium fluoride Carbon |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
