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Carbon compositing could stabilize the Cu<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>S structure and repress capacity fading during the electrochemical cycling, but the corresponding Li<jats:sup>+<\/jats:sup> storage mechanism and stabilization effect should be further clarified. In this study, nanoscale Cu<jats:sub>2<\/jats:sub>S was synthesized by CuS co\u2010precipitation and thermal reduction with polyelectrolytes. High\u2010temperature synchrotron radiation diffraction was used to monitor the thermal reduction process. During the first cycle, the conversion mechanism upon lithium storage in the Cu<jats:sub>2<\/jats:sub>S\/carbon was elucidated by <jats:italic>operando<\/jats:italic> synchrotron radiation diffraction and in\u2005situ X\u2010ray absorption spectroscopy. The N\u2010doped carbon\u2010composited Cu<jats:sub>2<\/jats:sub>S (Cu<jats:sub>2<\/jats:sub>S\/C) exhibits an initial discharge capacity of 425\u2005mAh\u2009g<jats:sup>\u22121<\/jats:sup> at 0.1\u2005A\u2009g<jats:sup>\u22121<\/jats:sup>, with a higher, long\u2010term capacity of 523\u2005mAh\u2009g<jats:sup>\u22121<\/jats:sup> at 0.1\u2005A\u2009g<jats:sup>\u22121<\/jats:sup> after 200 cycles; in contrast, the bare CuS electrode exhibits 123\u2005mAh\u2009g<jats:sup>\u22121<\/jats:sup> after 200 cycles. Multiple\u2010scan cyclic voltammetry proves that extra Li<jats:sup>+<\/jats:sup> storage can mainly be ascribed to the contribution of the capacitive storage.<\/jats:p>","DOI":"10.1002\/chem.202101818","type":"journal-article","created":{"date-parts":[[2021,7,28]],"date-time":"2021-07-28T05:52:35Z","timestamp":1627451555000},"page":"13774-13782","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Study of the Lithium Storage Mechanism of N\u2010Doped Carbon\u2010Modified Cu<sub>2<\/sub>S Electrodes for Lithium\u2010Ion Batteries"],"prefix":"10.1002","volume":"27","author":[{"given":"Guiying","family":"Tian","sequence":"first","affiliation":[{"name":"College of Chemical Engineering and Materials Science Tianjin University of Science and Technology  13th-Avenue 29, TEDA 300457 Tianjin P. R. 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