Ultrathin Nanotube/Nanowire Electrodes by Spin鈥揝pray Layer-by-Layer Assembly: A Concept for Transparent Energy Storage

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• 作者：Forrest S. Gittleson ; Daniel Hwang ; Won-Hee Ryu ; Sara M. Hashmi ; Jonathan Hwang ; Tenghooi Goh ; Andr茅 D. Taylor
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：October 27, 2015
• 年：2015
• 卷：9
• 期：10
• 页码：10005-10017
• 全文大小：960K
• ISSN：1936-086X

文摘

Fully integrated transparent devices require versatile architectures for energy storage, yet typical battery electrodes are thick (20鈥?00 渭m) and composed of optically absorbent materials. Reducing the length scale of active materials, assembling them with a controllable method and minimizing electrode thickness should bring transparent batteries closer to reality. In this work, the rapid and controllable spin鈥搒pray layer-by-layer (SSLbL) method is used to generate high quality networks of 1D nanomaterials: single-walled carbon nanotubes (SWNT) and vanadium pentoxide (V₂O₅) nanowires for anode and cathode electrodes, respectively. These ultrathin films, deposited with 鈭? nm/bilayer precision are transparent when deposited on a transparent substrate (>87% transmittance) and electrochemically active in Li-ion cells. SSLbL-assembled ultrathin SWNT anodes and V₂O₅ cathodes exhibit reversible lithiation capacities of 23 and 7 渭Ah/cm², respectively at a current density of 5 渭A/cm². When these electrodes are combined in a full cell, they retain 鈭? 渭Ah/cm² capacity over 100 cycles, equivalent to the prelithiation capacity of the limiting V₂O₅ cathode. The SSLbL technique employed here to generate functional thin films is uniquely suited to the generation of transparent electrodes and offers a compelling path to realize the potential of fully integrated transparent devices.