title: Dual-Size Silicon Nanocrystal-Embedded SiO(x) Nanocomposite as a High-Capacity Lithium Storage Material.
abstract: SiOx-based materials attracted a great deal of attention as high-capacity Li(+) storage materials for lithium-ion batteries due to their high reversible capacity and good cycle performance. However, these materials still suffer from low initial Coulombic efficiency as well as high production cost, which are associated with the complicated synthesis process. Here, we propose a dual-size Si nanocrystal-embedded SiOx nanocomposite as a high-capacity Li(+) storage material prepared via cost-effective sol-gel reaction of triethoxysilane with commercially available Si nanoparticles. In the proposed nanocomposite, dual-size Si nanocrystals are incorporated into the amorphous SiOx matrix, providing a high capacity (1914 mAh g(-1)) with a notably improved initial efficiency (73.6%) and stable cycle performance over 100 cycles. The highly robust electrochemical and mechanical properties of the dual-size Si nanocrystal-embedded SiOx nanocomposite presented here are mainly attributed to its peculiar nanoarchitecture. This study represents one of the most promising routes for advancing SiOx-based Li(+) storage materials for practical use.
authors.affiliation: †Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea.
authors.forename: Eunjun
authors.initials: E
authors.lastname: Park
authors.affiliation: †Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea.
authors.forename: Hyundong
authors.initials: H
authors.lastname: Yoo
authors.affiliation: ‡Advanced Batteries Research Center, Korea Electronic Technology Institute, 68 Yatap-dong, Bundang-gu, Seongnam 463-816, Republic of Korea.
authors.forename: Jaewoo
authors.initials: J
authors.lastname: Lee
authors.affiliation: ‡Advanced Batteries Research Center, Korea Electronic Technology Institute, 68 Yatap-dong, Bundang-gu, Seongnam 463-816, Republic of Korea.
authors.forename: Min-Sik
authors.initials: MS
authors.lastname: Park
authors.affiliation: ‡Advanced Batteries Research Center, Korea Electronic Technology Institute, 68 Yatap-dong, Bundang-gu, Seongnam 463-816, Republic of Korea.
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Kim
authors.affiliation: †Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea.
authors.forename: Hansu
authors.initials: H
authors.lastname: Kim
keywords: Si embedded SiOx nanocomposites; Si/SiOx; anodes; lithium-ion battery