Monday, May 19, 2014

Vanderbilt University - A Multifunctional Load-Bearing Solid-State Supercapacitor

"The biggest problem with designing load-bearing supercaps is preventing them from delaminating," said Westover. "Combining nanoporous material with the polymer electrolyte bonds the layers together tighter than superglue."
 
Andrew S. Westover, John W. Tian, Shivaprem Bernath, Landon Oakes, Rob Edwards, Farhan N. Shabab, Shahana Chatterjee, Amrutur V. Anilkumar, and Cary L. Pint
Nano Lett., DOI: 10.1021/nl500531r, Publication Date (Web): May 13, 2014


Abstract: A load-bearing, multifunctional material with the simultaneous capability to store energy and withstand static and dynamic mechanical stresses is demonstrated. This is produced using ion-conducting polymers infiltrated into nanoporous silicon that is etched directly into bulk conductive silicon. This device platform maintains energy densities near 10 W h/kg with Coulombic efficiency of 98% under exposure to over 300 kPa tensile stresses and 80 g vibratory accelerations, along with excellent performance in other shear, compression, and impact tests. This demonstrates performance feasibility as a structurally integrated energy storage material broadly applicable across renewable energy systems, transportation systems, and mobile electronics, among others.

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