Energy storage at 77 K in multilayer ceramic capacitors
- CeramPhysics, Inc., Westerville, OH (United States)
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.
- OSTI ID:
- 442738
- Report Number(s):
- CONF-960805-; TRN: IM9712%%163
- 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
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