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Jun Yang, Yuan-hua Lin, Bing-shu Guo, Ming-shan Wang, Jun-chen Chen, Zhi-yuan Ma, Yun Huang, and Xing Li, Enhanced electrochemical performance of Si/C electrode through surface modification using SrF2 particle, Int. J. Miner. Metall. Mater., 28(2021), No. 10, pp. 1621-1628. https://doi.org/10.1007/s12613-021-2270-x
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The silicon-based material exhibits a high theoretical specific capacity and is one of the best anode for the next generation of advanced lithium-ion batteries (LIBs). However, it is difficult for the silicon-based anode to form a stable solid-state interphase (SEI) during Li alloy/de-alloy process due to the large volume change (up to 300%) between silicon and Li4.4Si, which seriously limits the cycle life of the LIBs. Herein, we use strontium fluoride (SrF2) particle to coat the silicon−carbon (Si/C) electrode (SrF2@Si/C) to help forming a stable and high mechanical strength SEI by spontaneously embedding the SrF2 particle into SEI. Meanwhile the formed SEI can inhibit the volume expansion of the silicon−carbon anode during the cycle. The electrochemical test results show that the cycle performance and the ionic conductivity of the SrF2@Si/C anode has been significantly improved. The X-ray photoelectron spectroscopy (XPS) analysis reveals that there are fewer electrolyte decomposition products formed on the surface of the SrF2@Si/C anode. This study provides a facile approach to overcome the problems of Si/C electrode during the electrochemical cycling, which will be beneficial to the industrial application of silicon-based anode materials.
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