title: Flexible, Freestanding, and Binder-free SnO(x)-ZnO/Carbon Nanofiber Composites for Lithium Ion Battery Anodes.
abstract: Here, we demonstrate the production of electrospun SnO(x)-ZnO polyacrylonitrile (PAN) nanofibers (NFs) that are flexible, freestanding, and binder-free. This NF fabric is flexible and thus can be readily tailored into a coin for further cell fabrication. These properties allow volume expansion of the oxide materials and provide shortened diffusion pathways for Li ions than those achieved using the nanoparticle approach. Amorphous SnO(x)-ZnO particles were uniformly dispersed in the carbon NF (CNF). The SnO(x)-ZnO CNFs with a Sn:Zn ratio of 3:1 exhibited a superior reversible capacity of 963 mA·h·g(-1) after 55 cycles at a current density of 100 mA·g(-1), which is three times higher than the capacity of graphite-based anodes. The amorphous NFs facilitated Li2O decomposition, thereby enhancing the reversible capacity. ZnO prevented the aggregation of Sn, which, in turn, conferred stable and high discharge capacity to the cell. Overall, the SnO(x)-ZnO CNFs were shown to exhibit remarkably high capacity retention and high reversible and rate capacities as Li ion battery anodes.
authors.affiliation: School of Mechanical Engineering, Korea University , Seoul 02841, Republic of Korea.
authors.forename: Bhavana N
authors.initials: BN
authors.lastname: Joshi
authors.affiliation: School of Mechanical Engineering, Korea University , Seoul 02841, Republic of Korea.
authors.forename: Seongpil
authors.initials: S
authors.lastname: An
authors.affiliation: School of Mechanical Engineering, Korea University , Seoul 02841, Republic of Korea.
authors.forename: Hong Seok
authors.initials: HS
authors.lastname: Jo
authors.affiliation: School of Mechanical Engineering, Korea University , Seoul 02841, Republic of Korea.
authors.forename: Kyo Yong
authors.initials: KY
authors.lastname: Song
authors.affiliation: School of Mechanical Engineering, Korea University , Seoul 02841, Republic of Korea.
authors.forename: Hyun Goo
authors.initials: HG
authors.lastname: Park
authors.affiliation: Department of Materials Science & Eng., Korea University , Seoul 02841, Republic of Korea.
authors.forename: Sunwoo
authors.initials: S
authors.lastname: Hwang
authors.affiliation: Petrochemicals Research Chair, Department of Chemistry, King Saud University , Riyadh 11451, Saudi Arabia.
authors.forename: Salem S
authors.initials: SS
authors.lastname: Al-Deyab
authors.affiliation: Department of Materials Science & Eng., Korea University , Seoul 02841, Republic of Korea.
authors.forename: Woo Young
authors.initials: WY
authors.lastname: Yoon
authors.affiliation: School of Mechanical Engineering, Korea University , Seoul 02841, Republic of Korea.
authors.forename: Sam S
authors.initials: SS
authors.lastname: Yoon
keywords: SnOx; ZnO; carbon nanofiber; electrospinning; freestanding; lithium ion battery