Scalable Synthesis of High-performance Anode Material SiOx/C for Lithium-ion Batteries by Employing the Rochow Reaction Process

TY - JOUR

T1 - Scalable Synthesis of High-performance Anode Material SiOx/C for Lithium-ion Batteries by Employing the Rochow Reaction Process

AU - Gao, Xingyue

AU - Gao, Yuan

AU - Li, Qiongguang

AU - Wang, Yanhong

AU - Zhao, Dawei

AU - Xu, Guangwen

AU - Zhong, Ziyi

AU - Su, Fabing

PY - 2022/1/7

Y1 - 2022/1/7

N2 - The commercial application of silicon oxide (SiOx)-based anode materials in lithium-ion batteries (LIBs) is hindered by their poor electrochemical performance and difficulty in large-scale production. Here, we report a scalable synthesis of a carbon-coated SiOx composite (SiOx/C) as an excellent and stable anode material for LIBs. By employing the industrial Rochow reaction process, metallurgic grade Si microparticles first reacted with gaseous CH3OH over a Cu-based catalyst to generate alkoxysilanes (important organosilane monomers) and SiOx particles covered with organic compounds. After separation and washing, the obtained SiOx solid particles were carbonized to generate the SiOx/C composite. The prepared SiOx/C composite used as the anode material in LIBs could deliver a high reversible capacity of 581 mAh g-1 at a higher current density of 100 mA g-1 after 100 cycles and 510 mAh g-1 after 250 cycles even at a higher current density of 500 mA g-1. It is anticipated that by employing an industrial process for alkoxysilane synthesis with controlled reaction conditions, the large-scale preparation of a SiOx/C anode material becomes highly feasible.

AB - The commercial application of silicon oxide (SiOx)-based anode materials in lithium-ion batteries (LIBs) is hindered by their poor electrochemical performance and difficulty in large-scale production. Here, we report a scalable synthesis of a carbon-coated SiOx composite (SiOx/C) as an excellent and stable anode material for LIBs. By employing the industrial Rochow reaction process, metallurgic grade Si microparticles first reacted with gaseous CH3OH over a Cu-based catalyst to generate alkoxysilanes (important organosilane monomers) and SiOx particles covered with organic compounds. After separation and washing, the obtained SiOx solid particles were carbonized to generate the SiOx/C composite. The prepared SiOx/C composite used as the anode material in LIBs could deliver a high reversible capacity of 581 mAh g-1 at a higher current density of 100 mA g-1 after 100 cycles and 510 mAh g-1 after 250 cycles even at a higher current density of 500 mA g-1. It is anticipated that by employing an industrial process for alkoxysilane synthesis with controlled reaction conditions, the large-scale preparation of a SiOx/C anode material becomes highly feasible.

KW - SiOx/C composite

KW - scalable synthesis

KW - Rochow reaction

KW - anode

KW - lithium-ion batteries

U2 - 10.1016/j.jallcom.2022.163668

DO - 10.1016/j.jallcom.2022.163668

M3 - 文章

SN - 0925-8388

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -