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Title: Energy storage at 77 K in multilayer ceramic capacitors

Abstract

A ceramic material having a large dielectric constant at 77 K, {var_epsilon} = 8,000--12,000, has been developed for capacitive energy storage at this temperature. A large matrix of multilayer ceramic capacitors were fabricated using conventional tape-casting methods to optimize the dielectric breakdown strength at 77 K, and measured energy storage values on these capacitors range up to 6 J/cm{sup 3} at 77 K. An unfused bank of these capacitors was voltage-cycled 10{sup 5} times at 77 K without failure, and the heating effects during cycling were immeasurably small (i.e., nitrogen boiloff was monitored). An electrocaloric effect on discharge ({Delta}T {approximately} 1K) contributes to the thermal stability. Measurements of the frequency dependence of the dielectric properties of the ceramic at 77 K indicate a fundamental limit of about 8 {micro}s for the switching repetition rate. Improved capacitor-manufacturing methods are discussed which can increase the energy density to the 20--30 J/cm{sup 3} range.

Authors:
;  [1]
  1. CeramPhysics, Inc., Westerville, OH (United States)
Publication Date:
OSTI Identifier:
442738
Report Number(s):
CONF-960805-
TRN: IM9712%%163
Resource Type:
Conference
Resource Relation:
Conference: 31. intersociety energy conversion engineering conference, Washington, DC (United States), 9-14 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 31. intersociety energy conversion engineering conference. Volume 2: Conversion technologies, electro-chemical technologies, stirling engines, thermal management; Chetty, P.R.K.; Jackson, W.D.; Dicks, E.B. [eds.]; PB: 867 p.
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; CAPACITORS; CAPACITIVE ENERGY STORAGE EQUIPMENT; ENERGY STORAGE; TEMPERATURE RANGE 0065-0273 K; MANUFACTURING; PERFORMANCE; CERAMICS

Citation Formats

Lawless, W N, and Clark, Jr, C F. Energy storage at 77 K in multilayer ceramic capacitors. United States: N. p., 1996. Web.
Lawless, W N, & Clark, Jr, C F. Energy storage at 77 K in multilayer ceramic capacitors. United States.
Lawless, W N, and Clark, Jr, C F. Tue . "Energy storage at 77 K in multilayer ceramic capacitors". United States.
@article{osti_442738,
title = {Energy storage at 77 K in multilayer ceramic capacitors},
author = {Lawless, W N and Clark, Jr, C F},
abstractNote = {A ceramic material having a large dielectric constant at 77 K, {var_epsilon} = 8,000--12,000, has been developed for capacitive energy storage at this temperature. A large matrix of multilayer ceramic capacitors were fabricated using conventional tape-casting methods to optimize the dielectric breakdown strength at 77 K, and measured energy storage values on these capacitors range up to 6 J/cm{sup 3} at 77 K. An unfused bank of these capacitors was voltage-cycled 10{sup 5} times at 77 K without failure, and the heating effects during cycling were immeasurably small (i.e., nitrogen boiloff was monitored). An electrocaloric effect on discharge ({Delta}T {approximately} 1K) contributes to the thermal stability. Measurements of the frequency dependence of the dielectric properties of the ceramic at 77 K indicate a fundamental limit of about 8 {micro}s for the switching repetition rate. Improved capacitor-manufacturing methods are discussed which can increase the energy density to the 20--30 J/cm{sup 3} range.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}

Conference:
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