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Kim, Youngsik
YK Research
Research Interests
  • Ionic conducting ceramic electrolyte membranes, energy conversion and storage materials and devices


Anomalous ionic conductivity increase in Li2S+GeS2+GeO2 glasses

DC Field Value Language Kim, Youngsik ko Saienga, Jason ko Martin, Steve W. ko 2014-10-06T08:19:52Z - 2014-10-06 ko 2006-08 -
dc.identifier.citation JOURNAL OF PHYSICAL CHEMISTRY B, v.110, no.33, pp.16318 - 16325 ko
dc.identifier.issn 1520-6106 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract Numerous studies of the ionic conductivities in oxide-doped chalcogenaide glasses have shown the anomalous result that the ionic conductivity actually increases significantly (by more than a factor of 10 in some cases) by the initial addition of an oxide phase to a pure sulfide glass. After this initial sharp increase, the conductivity then monotonically decreases with further oxide addition. While this behavior is important to the application of these glasses for Li batteries, no definitive understanding of this behavior has been elucidated. To examine this effect further and more completely, the ionic conductivities of 0.5Li2S + 0.5[(1 - x)GeS2 + xGeO 2] glasses have been measured on disc-type bulk glasses. The ionic conductivity of the 0.5Li2S + 0.5GeS2 (x = 0) glass was observed to increase from 4.3 × 10-5 (Ω cm)-1 to 1.5 × 10-4 (Ω cm)-1 while the activation energy decreased to 0.358 eV from 0.385 eV by the addition of 5 mol % of GeO2. Further addition of GeO2 monotonically decreased the conductivity and increased the activation energy. On the basis of our previous studies of the structure of this glass system, the Anderson and Stuart model was applied to explain the decrease in the activation energy and increase in the conductivity. It is suggested that the "doorway" radius between adjacent cation sites increases slightly (from ∼0.29(±0.05) A to ∼0.40(±0.05) A) with the addition of oxygen to the glass and is proposed to be the major cause in decreasing the activation energy and thereby increasing the conductivity. Further addition of oxides appears to contract the glass structure (and the doorway radius) leading to an increase in the conductivity activation energy and a decrease in the conductivity. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Chalcogenaide glasses ko
dc.subject Li batteries ko
dc.subject Oxide phase ko
dc.subject Sulfide glass ko
dc.title Anomalous ionic conductivity increase in Li2S+GeS2+GeO2 glasses ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-33748631846 ko
dc.identifier.wosid 000239818000027 ko
dc.type.rims ART ko
dc.description.wostc 35 *
dc.description.scopustc 36 * 2015-05-06 * 2014-10-06 *
dc.identifier.doi 10.1021/jp060670c ko
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