title: High-Performance Si/SiOx Nanosphere Anode Material by Multipurpose Interfacial Engineering with Black TiO(2-x).
abstract: Silicon oxides (SiOx) have attracted recent attention for their great potential as promising anode materials for lithium ion batteries as a result of their high energy density and excellent cycle performance. Despite these advantages, the commercial use of these materials is still impeded by low initial Coulombic efficiency and high production cost associated with a complicated synthesis process. Here, we demonstrate that Si/SiOx nanosphere anode materials show much improved performance enabled by electroconductive black TiO(2-x) coating in terms of reversible capacity, Coulombic efficiency, and thermal reliability. The resulting anode material exhibits a high reversible capacity of 1200 mAh g(-1) with an excellent cycle performance of up to 100 cycles. The introduction of a TiO(2-x) layer induces further reduction of the Si species in the SiOx matrix phase, thereby increasing the reversible capacity and initial Coulombic efficiency. Besides the improved electrochemical performance, the TiO(2-x) coating layer plays a key role in improving the thermal reliability of the Si/SiOx nanosphere anode material at the same time. We believe that this multipurpose interfacial engineering approach provides another route toward high-performance Si-based anode materials on a commercial scale.
authors.affiliation: Department of Energy Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
authors.forename: Juhye
authors.initials: J
authors.lastname: Bae
authors.affiliation: Department of Energy Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
authors.forename: Dae Sik
authors.initials: DS
authors.lastname: Kim
authors.affiliation: Department of Energy Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
authors.forename: Hyundong
authors.initials: H
authors.lastname: Yoo
authors.affiliation: Department of Energy Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
authors.forename: Eunjun
authors.initials: E
authors.lastname: Park
authors.affiliation: Advanced Batteries Research Center, Korea Electronics Technology Institute , Seongnam 463-816, Republic of Korea.
authors.forename: Young-Geun
authors.initials: YG
authors.lastname: Lim
authors.affiliation: Advanced Batteries Research Center, Korea Electronics Technology Institute , Seongnam 463-816, Republic of Korea.
authors.forename: Min-Sik
authors.initials: MS
authors.lastname: Park
authors.affiliation: Advanced Batteries Research Center, Korea Electronics Technology Institute , Seongnam 463-816, Republic of Korea.
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Kim
authors.affiliation: Department of Energy Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
authors.forename: Hansu
authors.initials: H
authors.lastname: Kim
keywords: Li ion battery; Si-based anode materials; Si/SiOx nanosphere; TiO2−x coating; electrochemistry