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In particular, Na\n                    <jats:sub>3<\/jats:sub>\n                    V\n                    <jats:sub>2<\/jats:sub>\n                    (PO\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    (NVP) cathodes undergo \u223c8% volumetric fluctuations during biphasic (de)sodiation, progressively deteriorating the weak van der Waals\u2010governed interface between the polyvinylidene fluoride (PVDF) binder and the aluminum substrate, causing electrical isolation and capacity loss. Despite the widespread industrial use of carbon\u2010primed current collectors, a systematic understanding of their reinforcement mechanisms has been lacking. Herein, we elucidate three synergistic anchoring mechanisms through multi\u2010scale characterization. The carbon primer enhances surface roughness to promote mechanical interlocking, provides a compliant interlayer accommodating cyclic volumetric strain without debonding, and establishes electrostatic bridging between carboxylate functional groups and the fluorinated polymer backbone, as independently confirmed by Fourier transform infrared (FTIR) spectroscopy and X\u2010ray photoelectron spectroscopy (XPS). Control experiments verify that the performance bottleneck lies at the junction rather than in bulk electronic conductivity, while cross\u2010sectional wavelength\u2010dispersive spectroscopy mapping reveals that junction integrity governs sodiation uniformity throughout the electrode thickness. The primer\u2010integrated NVP\/\/hard carbon full cells retain 88.7% capacity after 300 cycles, establishing a design framework for reliable cathode\u2013current collector junctions in polyanion\u2010based energy storage systems.\n                  <\/jats:p>","DOI":"10.1002\/smll.75852","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T15:02:56Z","timestamp":1791558176000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Synergistic Electrostatic and Mechanical Anchoring at Cathode\u2013Current Collector Junctions for Durable Sodium\u2010Ion Batteries"],"prefix":"10.1002","author":[{"given":"Sieun","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Battery Convergence Engineering Kangwon National University  Chuncheon Republic of 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