title: Directly grown Si nanowire arrays on Cu foam with a coral-like surface for lithium-ion batteries.
abstract: In order to mitigate the drastic volumetric expansion (>300%) of silicon (Si) during the lithiation process, we demonstrate the synthesis of novel Si nanowire arrays (n-SNWAs) with a coral-like surface on Cu foam via a one-step CVD method, in which the Cu foam can simultaneously act as a catalyst and current collector. The unique coral-like surface endows n-SNWAs with a high structural integrity, which is beneficial for enhancing their electrochemical performance. In addition, the as-prepared n-SNWAs on Cu foam can be directly applied as the anode for lithium-ion batteries (LIBs), exhibiting a very high reversible discharge capacity (2745 mA h g(-1) at 200 mA g(-1)) and a fast charge and discharge capability (884 mA h g(-1) at 3200 mA g(-1)), which is much higher than the conventional SNWAs (c-SNWAs, only 127 mA h g(-1) at 3200 mA g(-1)). Meanwhile, they deliver an improved cycling stability (2178 mA h g(-1) at 400 mA g(-1) after 50 cycles). More significantly, the as-synthesized n-SNWAs on Cu foam also possess a superior specific areal capacity of 4.1 mA h cm(-2) at 0.6 mA cm(-2). Such excellent electrochemical performance is superior, or at least comparable, to the best report for Si anode materials. Combining the cost-effective and facile preparation method, the present n-SNWAs on Cu foam can serve as a promising anode for LIBs.
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. jianghao@ecust.edu.cn czli@ecust.edu.cn.
authors.forename: Shilong
authors.initials: S
authors.lastname: Jing
authors.forename: Hao
authors.initials: H
authors.lastname: Jiang
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Hu
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Li