Tin-Coated Viral Nanoforests as Sodium-Ion Battery Anodes
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- 作者：Yihang Liu ; Yunhua Xu ; Yujie Zhu ; James N. Culver ; Cynthia A. Lundgren ; Kang Xu ; Chunsheng Wang
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：April 23, 2013
- 年：2013
- 卷：7
- 期：4
- 页码：3627-3634
- 全文大小：558K
- 年卷期：v.7,no.4(April 23, 2013)
- ISSN：1936-086X
文摘
Designed as a high-capacity alloy host for Na-ion chemistry, a forest of Sn nanorods with a unique core鈥搒hell structure was synthesized on viral scaffolds, which were genetically engineered to ensure a nearly vertical alignment upon self-assembly onto a metal substrate. The interdigital spaces thus formed between individual rods effectively accommodated the volume expansion and contraction of the alloy upon sodiation/desodiation, while additional carbon-coating engineered over these nanorods further suppressed Sn aggregation during extended electrochemical cycling. Due to the unique nanohierarchy of multiple functional layers, the resultant 3D nanoforest of C/Sn/Ni/TMV1cys, binder-free composite electrode already and evenly assembled on a stainless steel current collector, exhibited supreme capacity utilization and cycling stability toward Na-ion storage and release. An initial capacity of 722 mA路h (g Sn)鈭? along with 405 mA路h (g Sn)鈭? retained after 150 deep cycles demonstrates the longest-cycling nano-Sn anode material for Na-ion batteries reported in the literature to date and marks a significant performance improvement for neat Sn material as alloy host for Na-ion chemistry.