Effect of Fluorine-Containing Additive on the Electrochemical Properties of Silicon Anode for Lithium-Ion Batteries

Abstract:

Silicon anode is a promising candidate as an alternative to the conventional graphitic anode in lithium-ion batteries. In this work, silicon anode is modified by NH₄F using a facile method in air. The concentration of NH₄F on the electrochemical performance is systematically checked. The 5wt%NH₄F-modified silicon anode exhibits enhanced cycle and rate performances, the first discharge specific capacity is 3958 mAh·g^-1 with 86.45% as the coulombic efficiency at 0.4A·g^-1. The capacity can maintain at 703.3 mAh·g^-1 after 50 cycles, exhibiting a much better cycle stability than pristine silicon anode (329.9 mAh·g^-1 after 50 cycles). SEM images confirm that NH₄F can alleviate the volume expansion of silicon since LiF can be generated at the surface which is beneficial to the stability of solid-electrolyte interphase (SEI).

• Periodical: Materials Science Forum (Volume 944)
• Pages: 699-704
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.699
• Online since: January 2019
• Authors: Jing Wang*, Xiao Hang Yang, Yue Feng Su, Shi Chen, Feng Wu
• Keywords: Anode Material, Lithium-Ion Batteries, NH₄F, Silicon

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