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However, issues related to reversibility, energy efficiency and kinetics prevent their practical application. Here we report on the synthesis, structural and electrochemical properties of ternary metal fluorides (M<jats:sup>1<\/jats:sup><jats:sub><jats:italic>y<\/jats:italic><\/jats:sub>M<jats:sup>2<\/jats:sup><jats:sub>1-<jats:italic>y<\/jats:italic><\/jats:sub>F<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>: M<jats:sup>1<\/jats:sup>, M<jats:sup>2<\/jats:sup>=Fe, Cu), which may overcome these issues. By substituting Cu into the Fe lattice, forming the solid\u2013solution Cu<jats:sub><jats:italic>y<\/jats:italic><\/jats:sub>Fe<jats:sub>1-<jats:italic>y<\/jats:italic><\/jats:sub>F<jats:sub>2<\/jats:sub>, reversible Cu and Fe redox reactions are achieved with surprisingly small hysteresis (&lt;150\u2009mV). This finding indicates that cation substitution may provide a new avenue for tailoring key electrochemical properties of conversion electrodes. Although the reversible capacity of Cu conversion fades rapidly, likely due to Cu<jats:sup>+<\/jats:sup> dissolution, the low hysteresis and high energy suggest that a Cu-based fluoride cathode remains an intriguing candidate for rechargeable lithium batteries.<\/jats:p>","DOI":"10.1038\/ncomms7668","type":"journal-article","created":{"date-parts":[[2015,3,26]],"date-time":"2015-03-26T10:52:22Z","timestamp":1427367142000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":182,"title":["Ternary metal fluorides as high-energy cathodes with low cycling hysteresis"],"prefix":"10.1038","volume":"6","author":[{"given":"Feng","family":"Wang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sung-Wook","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong-Hwa","family":"Seo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kisuk","family":"Kang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liping","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1921-6683","authenticated-orcid":false,"given":"Dong","family":"Su","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John J.","family":"Vajo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason","family":"Graetz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2015,3,26]]},"reference":[{"key":"BFncomms7668_CR1","doi-asserted-by":"publisher","first-page":"359","DOI":"10.1038\/35104644","volume":"414","author":"J-M Tarascon","year":"2001","unstructured":"Tarascon, J.-M. & Armand, M. 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