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Proceedings Paper

Using tobacco mosaic virus template for the fabrication of three-dimensional hierarchical microbattery electrodes with high energy and high power density
Author(s): Ekaterina Pomerantseva; Konstantinos Gerasopoulos; Markus Gnerlich; Philipp Odenwald; James Culver; Reza Ghodssi
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Paper Abstract

We present a novel approach for the fabrication of lithium-ion microbattery electrodes which deliver high energy and high power density. The key enabling technology is the use of self-assembled Tobacco mosaic virus (TMV) nanoforests as a template for active battery materials. The self-assembling TMV is a genetically modified biological nanorod with increased metal binding properties for enhanced manufacturability. High energy density is achieved due to the active surface area increase within a given footprint by combining TMV with three-dimensional (3D) microfabricated structures. The TMV nanostructure enables high power density through larger electrode/electrolyte contact area and faster charge transport. The electrodes consist of an array of electroplated gold micropillars. The pillars are coated with the self-assembled nanoscale TMV template and subsequently metalized in-place. Active battery material (V2O5) is conformally deposited using atomic layer deposition (ALD) on the hierarchical micro/nano network. Electrochemical testing of these electrodes indicates a 3-5 fold increase in energy density, compared to the TMV-templated electrodes without micropillars, without increasing footprint area or reducing rate performance. Further increase in energy density can be achieved by increasing surface area of 3D microelements as demonstrated by fabrication and electrochemical testing of the electrodes with hollow gold micropillars. Scaling up energy density by increasing active material thickness beyond 100 nm revealed some loss in surface area which highlighted the importance of nanoscale engineering for achieving maximum energy and power density in energy storage systems.

Paper Details

Date Published: 19 September 2013
PDF: 8 pages
Proc. SPIE 8820, Nanoepitaxy: Materials and Devices V, 88200T (19 September 2013); doi: 10.1117/12.2024076
Show Author Affiliations
Ekaterina Pomerantseva, Univ. of Maryland, College Park (United States)
Konstantinos Gerasopoulos, Univ. of Maryland, College Park (United States)
Markus Gnerlich, Univ. of Maryland, College Park (United States)
Philipp Odenwald, Univ. of Maryland, College Park (United States)
James Culver, Univ. of Maryland, College Park (United States)
Reza Ghodssi, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 8820:
Nanoepitaxy: Materials and Devices V
Nobuhiko P. Kobayashi; A. Alec Talin; Albert V. Davydov; M. Saif Islam, Editor(s)

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