title: Silicon/Carbon Nanotube/BaTiO₃ Nanocomposite Anode: Evidence for Enhanced Lithium-Ion Mobility Induced by the Local Piezoelectric Potential.
abstract: We report on the synergetic effects of silicon (Si) and BaTiO3 (BTO) for applications as the anode of Li-ion batteries. The large expansion of Si during lithiation was exploited as an energy source via piezoelectric BTO nanoparticles. Si and BTO nanoparticles were dispersed in a matrix consisting of multiwalled carbon nanotubes (CNTs) using a high-energy ball-milling process. The mechanical stress resulting from the expansion of Si was transferred via the CNT matrix to the BTO, which can be poled, so that a piezoelectric potential is generated. We found that this local piezoelectric potential can improve the electrochemical performance of the Si/CNT/BTO nanocomposite anodes. Experimental measurements and simulation results support the increased mobility of Li-ions due to the local piezoelectric potential.
authors.forename: Byoung-Sun
authors.initials: BS
authors.lastname: Lee
authors.affiliation: Nano & Smart Composite Materials Laboratory, Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University , 1 Gwanangno, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Yoon
authors.forename: Changhoon
authors.initials: C
authors.lastname: Jung
authors.forename: Dong Young
authors.initials: DY
authors.lastname: Kim
authors.affiliation: Nano & Smart Composite Materials Laboratory, Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University , 1 Gwanangno, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Seung-Yeol
authors.initials: SY
authors.lastname: Jeon
authors.forename: Ki-Hong
authors.initials: KH
authors.lastname: Kim
authors.forename: Jun-Ho
authors.initials: JH
authors.lastname: Park
authors.forename: Hosang
authors.initials: H
authors.lastname: Park
authors.forename: Kang Hee
authors.initials: KH
authors.lastname: Lee
authors.forename: Yoon-Sok
authors.initials: YS
authors.lastname: Kang
authors.forename: Jin-Hwan
authors.initials: JH
authors.lastname: Park
authors.forename: Heechul
authors.initials: H
authors.lastname: Jung
authors.affiliation: Nano & Smart Composite Materials Laboratory, Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University , 1 Gwanangno, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Woong-Ryeol
authors.initials: WR
authors.lastname: Yu
authors.forename: Seok-Gwang
authors.initials: SG
authors.lastname: Doo
keywords: Li-ion mobility; large volume expansion; local electric potential; piezoelectric particle; silicon anode