title: Supercritical Carbon Dioxide-Assisted Process for Well-Dispersed Silicon/Graphene Composite as a Li ion Battery Anode.
abstract: The silicon (Si)/graphene composite has been touted as one of the most promising anode materials for lithium ion batteries. However, the optimal fabrication method for this composite remains a challenge. Here, we developed a novel method using supercritical carbon dioxide (scCO2) to intercalate Si nanoparticles into graphene nanosheets. Silicon was modified with a thin layer of polyaniline, which assisted the dispersion of graphene sheets by introducing π-π interaction. Using scCO2, well-dispersed Si/graphene composite was successfully obtained in a short time under mild temperature. The composite showed high cycle performance (1,789 mAh/g after 250 cycles) and rate capability (1,690 mAh/g at a current density of 4,000 mA/g). This study provides a new approach for cost-effective and scalable preparation of a Si/graphene composite using scCO2 for a highly stable lithium battery anode material.
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Sang Ha
authors.initials: SH
authors.lastname: Lee
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Sengyoen
authors.initials: S
authors.lastname: Park
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Min
authors.initials: M
authors.lastname: Kim
authors.affiliation: School of Mechanical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Dohyeon
authors.initials: D
authors.lastname: Yoon
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Chalathorn
authors.initials: C
authors.lastname: Chanthad
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Misuk
authors.initials: M
authors.lastname: Cho
authors.affiliation: School of Mechanical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, Yonsei, 120-749 Seoul, Korea.
authors.forename: Jong Hyeok
authors.initials: JH
authors.lastname: Park
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University, 440-746 Suwon, Korea.
authors.forename: Youngkwan
authors.initials: Y
authors.lastname: Lee