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ACS Nano. 2013 Apr 23;7(4):3627-34. doi: 10.1021/nn400601y. Epub 2013 Mar 20.

Tin-coated viral nanoforests as sodium-ion battery anodes.

Author information

1
Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States.

Abstract

Designed as a high-capacity alloy host for Na-ion chemistry, a forest of Sn nanorods with a unique core-shell 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·h (g Sn)(-1) along with 405 mA·h (g Sn)(-1) 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.

PMID:
23484633
DOI:
10.1021/nn400601y
[Indexed for MEDLINE]

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