title: Polymer-free Vertical Transfer of Silicon Nanowires and their Application to Energy Storage.
abstract: Silicon nanowires (SiNWs) for use as lithium-ion battery (LIB) anode materials have been studied for their one-dimensional (1D) properties and ability to accommodate large volume changes and avoid rapid capacity fading during cycling. Although the vertical transfer of SiNWs from their original substrate onto a conducting electrode is very important, to date, there has been no report of a direct integration method without polymer binders. Here, we propose for the first time a vertical transfer method for SiNWs grown on a Si substrate directly to the current-collecting electrode without using a polymer adhesive for the use as a binder-free LIB anode. The vertical SiNWs produced using a low-cost wafer-scale metal-assisted chemical etching (MaCE) process have been successfully transferred directly to a copper electrode coated with a thin Ag layer by using a simple hot pressing method. When evaluated as an LIB anode without using conventional polymeric binder and a conducting additive, the transferred vertically aligned SiNWs showed a high specific capacity (≈2150 mAh g(-1) ) and excellent rate performance. It is believed that the anode-manufacturing process is simple and fast, thus enabling a large-scale production that is of low-cost, broadly applicable, and provides new avenues for the rational engineering of Si-based electrode materials with enhanced power density and conductivity.
authors.affiliation: Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials (KIMM), 104, Jang-dong, Yuseong-gu, Daejeon 305-343 (Republic of Korea).
authors.forename: Han-Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Jihye
authors.initials: J
authors.lastname: Lee
authors.forename: Sang Eon
authors.initials: SE
authors.lastname: Lee
authors.forename: Wanjung
authors.initials: W
authors.lastname: Kim
authors.forename: Hwan Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Dae-Geun
authors.initials: DG
authors.lastname: Choi
authors.forename: Jong Hyeok
authors.initials: JH
authors.lastname: Park
mesh_terms: D004553:Electric Conductivity; D011211:Electric Power Supplies / Q000191:economics; D004566:Electrodes; D008094:Lithium / Q000737:chemistry; D053770:Nanowires / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*
chemical_list: D008094:Lithium; D012825:Silicon
keywords: anode; batteries; binder-free; nanostructures; silicon