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DC Field | Value | Language |
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dc.citation.number | 26 | - |
dc.citation.startPage | 1801591 | - |
dc.citation.title | ADVANCED ENERGY MATERIALS | - |
dc.citation.volume | 8 | - |
dc.contributor.author | Kim, Haegyeom | - |
dc.contributor.author | Seo, Dong-Hwa | - |
dc.contributor.author | Bianchini, Matteo | - |
dc.contributor.author | Clement, Raphaele J. | - |
dc.contributor.author | Kim, Hyunchul | - |
dc.contributor.author | Kim, Jae Chul | - |
dc.contributor.author | Tian, Yaosen | - |
dc.contributor.author | Shi, Tan | - |
dc.contributor.author | Yoon, Won-Sub | - |
dc.contributor.author | Ceder, Gerbrand | - |
dc.date.accessioned | 2023-12-21T20:11:50Z | - |
dc.date.available | 2023-12-21T20:11:50Z | - |
dc.date.created | 2019-12-03 | - |
dc.date.issued | 2018-09 | - |
dc.description.abstract | The exploration of high-energy-density cathode materials is vital to the practical use of K-ion batteries. Layered K-metal oxides have too high a voltage slope due to their large K+-K+ interaction, resulting in low specific capacity and average voltage. In contrast, the 3D arrangement of K+, with polyanions separating them, reduces the strength of the effective K+-K+ repulsion, which in turn increases specific capacity and voltage. Here, stoichiometric KVPO4F for use as a high-energy-density K-ion cathode is developed. The KVPO4F cathode delivers a reversible capacity of approximate to 105 mAh g(-1) with an average voltage of approximate to 4.3 V (vs K/K+), resulting in a gravimetric energy density of approximate to 450 Wh kg(-1). During electrochemical cycling, the KxVPO4F cathode goes through various intermediate phases at x = 0.75, 0.625, and 0.5 upon K extraction and reinsertion, as determined by ex situ X-ray diffraction characterization and ab initio calculations. This work further explains the role of oxygen substitution in KVPO4+xF1-x: the oxygenation of KVPO4F leads to an anion-disordered structure which prevents the formation of K+/vacancy orderings without electrochemical plateaus and hence to a smoother voltage profile. | - |
dc.identifier.bibliographicCitation | ADVANCED ENERGY MATERIALS, v.8, no.26, pp.1801591 | - |
dc.identifier.doi | 10.1002/aenm.201801591 | - |
dc.identifier.issn | 1614-6832 | - |
dc.identifier.scopusid | 2-s2.0-85050357254 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/30518 | - |
dc.identifier.url | https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201801591 | - |
dc.identifier.wosid | 000444537800022 | - |
dc.language | 영어 | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.title | A New Strategy for High-Voltage Cathodes for K-Ion Batteries: Stoichiometric KVPO4F | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter | - |
dc.relation.journalResearchArea | Chemistry; Energy & Fuels; Materials Science; Physics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | cathodes | - |
dc.subject.keywordAuthor | fluorophosphate | - |
dc.subject.keywordAuthor | K-ion batteries | - |
dc.subject.keywordAuthor | polyanion | - |
dc.subject.keywordPlus | SOLID-STATE NMR | - |
dc.subject.keywordPlus | ELECTROCHEMICAL PROPERTIES | - |
dc.subject.keywordPlus | POTASSIUM INTERCALATION | - |
dc.subject.keywordPlus | HYPERFINE SHIFTS | - |
dc.subject.keywordPlus | AB-INITIO | - |
dc.subject.keywordPlus | LIVPO4F | - |
dc.subject.keywordPlus | FLUOROPHOSPHATE | - |
dc.subject.keywordPlus | ENVIRONMENTS | - |
dc.subject.keywordPlus | PERFORMANCE | - |
dc.subject.keywordPlus | PHOSPHATES | - |
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