B-Doped Si@C Nanorod Anodes for High-Performance Lithium-Ion Batteries

Abstract

B doping plays an important role in improving the conductivity and electrochemical properties of Si anodes for Li-ion batteries. Herein, we developed a facile and massive production strategy to fabricate C-coated B-doped Si (B-Si@C) nanorod anodes using casting intermediate alloys of Al-Si and Al-B and dealloying followed by C coating. The B-Si@C nanorod anodes demonstrate a high specific capacity of 560 mAg-1, with a high initial coulombic efficiency of 90.6% and substantial cycling stability. Notably, the melting cast approach is facile, simple, and applicable to doping treatments, opening new possibilities for the development of low-cost, environmentally benign, and high-performance Li-ion batteries.

Advances in silicon–carbon composites anodes derived from agro wastes for applications in lithium-ion battery: A review

“…Silicon/carbon composite is being considered extensively because of its excellent operability while carbon offers high electrical conductivity and cycle stability. Hence, the anode with a high specific capacity will have improved electrical conductivity if carbon is added to silicon [ 13 , 14 ]. Furthermore, the outer shell of carbon can operate as a buffer between the silicon and electrolyte, preventing direct contact, generating a stable solid electrolyte interphase coating and lessening volume variation during charging and discharging.…”

Recent Advances in the Structural Design of Silicon/Carbon Anodes for Lithium Ion Batteries: A Review

“…Carbon materials show high cycling stability and high electrical conductivity. Therefore, compounding silicon with carbon will provide high specific capacity, and obtain significantly improved electrical conductivity of anode [26][27][28]. Additionally, as a buffer for the silicon anode, the outer carbon shell can prevent direct contact between electrolyte and silicon [29], forming a stable SEI film and reducing the volume changes during charging and discharging.…”