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Herein, a productive and up\u2010scalable approach is proposed for in situ growth of nitrogen\u2010doped carbon nanotubes (N\/CNTs) by introducing commercial expanded graphites (EGs) as micro\u2010containers for enhancement of reaction rates and reduction of energy costs. With the solid carbonaceous (polyvinylpyrrolidone, PVP) and catalytic (Fe\u2010based or Co\u2010based) precursors incubated in the micro\u2010containers, the local sufficient self\u2010supply of C\/N sources ensures the in situ growth of high\u2010quality N\/CNTs with a high yield over 14% and a faster formation rate compared to a conventional open configuration. Growth behavior, morphology, and structure of products are conditioned by the dimension and structure of micro\u2010containers, the ratio of source\/catalyst precursors, and pyrolyzation temperature. The N\/CNTs\u2010based hierarchical architectures are demonstrated to have superior Li\u2010ion storage performance as anode materials, say, a capacity of 1129.5 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 0.05 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    and a retention of 99.5% (95.0%) for 0.1 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    (10 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) after 100 (10\u00a0000) cycles. This strategy can be generalized for the preparation of other nanostructures.\n                  <\/jats:p>","DOI":"10.1002\/smll.202513915","type":"journal-article","created":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T12:30:36Z","timestamp":1769171436000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Confinement and Self\u2010Supply of Carbon Sources by Micro\u2010Containers Enable Efficient In Situ Growth of Carbon Nanotubes for Li\u2010Ion Storage"],"prefix":"10.1002","volume":"22","author":[{"given":"Luting","family":"Song","sequence":"first","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sai","family":"Su","sequence":"additional","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongdong","family":"Mao","sequence":"additional","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"},{"name":"Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhengwei","family":"Fan","sequence":"additional","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"},{"name":"Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pian","family":"Zhang","sequence":"additional","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"},{"name":"Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yijia","family":"Qin","sequence":"additional","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"},{"name":"Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peipei","family":"Chen","sequence":"additional","affiliation":[{"name":"Nanofabrication Laboratory National Center for Nanoscience and Technology  Beijing P. R. China"},{"name":"Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences  Beijing P. R. 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