Si-induced insertion of Li into SiC to form Li-rich SiC twin crystal |
| |
| Institution: | 1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;2. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;3. School of Engineering, Newcastle University, NE1 7RU, United Kingdom;1. State Key Laboratory of Multiphase Flow in Power Engineering (SKLMFPE), Xi''an Jiaotong University, Xi''an, 710049, Shaanxi, China;2. Xi''an Electronic Engineering Research Institute, Xi''an, 710100, Shaanxi, China;1. Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China;2. Zhuhai Institute of Modern Industrial Innovation, South China University of Technology, Zhuhai, 519175, China;3. School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, China;1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China;2. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China;3. Sino-German College, University of Shanghai for Science and Technology, Shanghai, China;1. State Key Lab of Materials Forming and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore |
| |
| Abstract: | The energy density of Li-ion batteries is closely related to the capacity and average voltage of cathode materials. Unfortunately, current cathode materials either have low capacity or voltage, which limits the development of high-energy-density Li-ion batteries. This has given challenge to many attempts to develop new cathode materials with high capacity and voltage. In this study, we find that Li easily inserts into the (111) plane of SiC in the presence of Si, and a well-organized Li-rich SiC twin crystal is formed. Ultraviolet–visible diffuse reflectance spectra and electrochemical test results suggest that this Li-rich SiC twin crystal possesses the band gap energy of 3.5 eV and charging capacity of 1979 mAh/g at the current density of 200 mA/g, making it a promising candidate for the cathode material in high-capacity Li-ion batteries. X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy results reveal that Si-induced Li insertion contributes to the changes in the surface species and structure of pristine SiC. These findings suggest that the Li-rich SiC twin crystal raises new possibilities for the development of high-capacity cathode materials and merits further investigation to expand its application scope. |
| |
| Keywords: | Si Li insertion SiC Li-rich twin crystal Cathode Li-ion batteries |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
