Super Dielectric Material Based Capacitors: Punched Membrane/Gel
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Authors
Petty, C.W.
Phillips, J.
Subjects
Supercapacitor
super dielectric materials
energy and power density
Ragone chart
super dielectric materials
energy and power density
Ragone chart
Advisors
Date of Issue
2018-05-23
Date
May 23, 2018
Publisher
SpringerLink
Language
Abstract
Extensive testing showed, as predicted, that punched membranes, filled with a
gel containing aqueous salt solutions, behave as superdielectric materials
(SDM). Punched membrane superdielectrics employed herein consisted of a
commercial cellulose based membrane material, Celgard 16 µ thick, a material
frequently used as a separator material in supercapacitors, into which
macroscopic holes (ca. 2.5 mm) were punched with a laser cutter, and the
holes subsequently filled with a gel-like material composed of fumed silica,
NaCl and water. The gross dielectric constants measured, generally > 10⁵,
and the energy densities,> 40 J/cmᵌ during slow discharge, were in the range
expected for superdielectric materials. The measured capacitance and energy
density tracked the number of holes punched/area filled with the dielectric gel.
Also, the observed power law decrease in all parameters including energy,
power and capacitance, followed the same trends observed in other classes of
SDM. Control studies included testing dielectrics composed of Celgard into
which no holes were punched, but the SDM gel spread, also produced values
consistent with the SDM model: no measurable capacitance using the standard
protocol. Finally, the values measured suggest these materials rival the
energy density of some common battery types at low discharge rates, and
surpass the best commercial supercapacitors at low discharge rates.
Type
Article
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
8 p.
Citation
Petty, C. W., and J. Phillips. "Super Dielectric Material Based Capacitors: Punched Membrane/Gel." Journal of Electronic Materials (2018): 1-8.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.