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However, successful extraction\/reinsertion of all the lithium ions in triplite host is challenging even at a low current rate, resulting in a low specific capacity. These experimental findings contrast with previous theoretical works that predicted that the triplite structure would be a fast ionic conductor with low activation barriers for lithium\u2010ion hopping. Origin of this discrepancy is elusive to date. Herein, combined first\u2010principles calculations and high\u2010angle annular dark\u2010field scanning transmission electron microscopy analyses reveal that typical triplite structure is composed of nanodomains consisting of corner\u2010shared FeO<jats:sub>4<\/jats:sub>F<jats:sub>2<\/jats:sub> octahedra, whereas their domain boundaries are regions of mixed corner\/edge\u2010shared FeO<jats:sub>4<\/jats:sub>F<jats:sub>2<\/jats:sub> octahedra. More importantly, these locally disordered domain boundaries significantly reduce the overall lithium diffusivity of the materials. Inspired by these findings, this study redesigns triplite structure with sufficiently small sizes to avoid local bottlenecks arising from the domain boundaries, successfully achieving nearly full lithium extraction\/reinsertion with high power and energy density. This work represents the first direct observation of the presence of domain boundaries within a crystalline structure playing a critical role in governing the lithium diffusivity in a battery electrode.<\/jats:p>","DOI":"10.1002\/aenm.201701408","type":"journal-article","created":{"date-parts":[[2017,10,12]],"date-time":"2017-10-12T15:19:20Z","timestamp":1507821560000},"source":"Crossref","is-referenced-by-count":17,"title":["Intrinsic Nanodomains in Triplite LiFeSO<sub>4<\/sub>F and Its Implication in Lithium\u2010Ion Diffusion"],"prefix":"10.1002","volume":"8","author":[{"given":"Dong\u2010Hwa","family":"Seo","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials (RIAM) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyu\u2010Young","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials (RIAM) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"},{"name":"Center for Nanoparticle Research at Institute for Basic Science (IBS) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Haegyeom","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials (RIAM) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sung\u2010Kyun","family":"Jung","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials (RIAM) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"},{"name":"Center for Nanoparticle Research at Institute for Basic Science (IBS) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Min\u2010Sik","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Advanced Materials Engineering for Information and Electronics Kyung Hee University  Yongin Gyeonggi 17104 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8696-1886","authenticated-orcid":false,"given":"Kisuk","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials (RIAM) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"},{"name":"Center for Nanoparticle Research at Institute for Basic Science (IBS) Seoul National University  1 Gwanak\u2010ro Gwanak\u2010gu Seoul 151\u2010742 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,10,12]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/451652a"},{"key":"e_1_2_7_2_1","unstructured":"a)M.Lowe S.Tokuoka T.Trigg G.Gereffi Center on Globalization2010;"},{"key":"e_1_2_7_2_2","unstructured":"b)D. 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