Initiation Of Degradation In Polycrystalline Sodium Beta Alumina Electrolytes

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Initiation Of Degradation In Polycrystalline Sodium Beta Alumina Electrolytes

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Author :
language : en
Publisher:
Release Date : 1980

Initiation Of Degradation In Polycrystalline Sodium Beta Alumina Electrolytes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.

Sodium-beta alumina solid electrolytes degrade during use in sodium sulfur cells. The degradation can take two forms: Mode I degradation involving the rapid propagation of macroscopic cracks driven by cathodic deposition of sodium in them; and Mode II degradation involving a slow degradation due to electron injection from the Na/.beta. alumina contact. The initiation stage of Mode I is the most important one since cracks propagate rapidly once they are formed. The significance of the local microstructure on the Mode I initiation is discussed. It appears that grain boundaries can be favorable sites for Mode I failure initiation.

Factors Contributing To The Breakdown Of Sodium Beta Alumina Solid Electolytes

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Author : Andrew C. Buechele
language : en
Publisher:
Release Date : 1982

Factors Contributing To The Breakdown Of Sodium Beta Alumina Solid Electolytes written by Andrew C. Buechele and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Charge transfer categories.

Factors Contributing To The Breakdown Of Sodium Beta Alumina

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Author :
language : en
Publisher:
Release Date : 1982

Factors Contributing To The Breakdown Of Sodium Beta Alumina written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.

Clarification of the breakdown process occurring during charge transfer in sodium beta alumina solid electrolytes was derived from: (1) studying the effects of molten sodium contact at 350°C on single crystal sodium beta alumina and polycrystalline sodium beta alumina; (2) determination of critical current density by monitoring acoustic emissions accompanying crack growth in sodium/sodium beta alumina/sodium cells subjected to linear current ramping at 1 mA cm−2 sec−1; (3) failure analysis conducted on cycled electrolytes, some from commercial sodium/sulfur cells, which had been subjected to up to 703 Ahr cm−2 of charge transfer. Gray coloration developing in beta aluminas in contact with molten sodium was found to be a consequence of formation, through reduction by sodium, of oxygen vacancies charge compensated by electrons. Electronic conductivity of the electrolyte increases as a result. No second phase formation was detected. Colored electrolytes from sodium/sulfur cells show evidence of a newly recognized degradation mechanism in which fracture occurs when sodium is reduced and deposited internally under pressure as metal in regions where an electronic conductivity gradient exists. Heating colored beta aluminas in air produces reoxidation and bleaching. Kinetics and other properties of the coloration and bleaching processes were determined. Critical current density was found to bear an inverse relation to average electrolyte grain size. Evidence was found in the cycled electrolytes for a slow crack growth mechanism and a progressive mode of degradation advancing from the sulfur electrode interface. Implications of the findings for the construction and operation of sodium/sulfur battery systems are discussed.

Degradation Of Sodium Beta Alumina Electrolyte In Contact With Sulfur Sodium Polysulfide Melt

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Author : Meilin Liu
language : en
Publisher:
Release Date : 1986

Degradation Of Sodium Beta Alumina Electrolyte In Contact With Sulfur Sodium Polysulfide Melt written by Meilin Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1990

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Power resources categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1989

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.

Degradation Phenomena In Solid Electrolytes

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Author : David Charles Hitchcock
language : en
Publisher:
Release Date : 1985

Degradation Phenomena In Solid Electrolytes written by David Charles Hitchcock and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.

Electrolytic Degradation Of Sodium Beta Alumina

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Author : Leslie Arthur Feldman
language : en
Publisher:
Release Date : 1982

Electrolytic Degradation Of Sodium Beta Alumina written by Leslie Arthur Feldman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Charge transfer categories.

Substructure And Properties Of Sodium Beta Alumina Solid Electrolytes Interim Report

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Author : L. C. De Jonghe
language : en
Publisher:
Release Date : 1975

Substructure And Properties Of Sodium Beta Alumina Solid Electrolytes Interim Report written by L. C. De Jonghe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.

Sodium Sulphur Battery

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Author : J. Sudworth
language : en
Publisher: Springer Science & Business Media
Release Date : 1985-11-30

Sodium Sulphur Battery written by J. Sudworth and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985-11-30 with Science categories.

This book should be of interest to general science, physics and physical sciences courses.