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Herein, we design a sandwich-structured composite comprising a SiO2@spiropyran@PVDF core-shell interlayer, a crosslinked PVDF outer layer, and a PANI-blended PVDF outer layer. This architecture enables synergistic interfacial polarization amplification, leakage suppression, and photochromic fluorescence for anticounterfeiting. The composite achieves a dielectric constant of 34.2 with low loss, a discharged energy density of 9.07 J cm\u20133 with an efficiency of 73.8%, and a large switchable polarization difference of 4.78 \u03bcC cm\u20132. It also retains the flexibility of pure PVDF and exhibits excellent biocompatibility, as evidenced by a cell viability of 94.5% after 120 h incubation, comparable to the negative control.<\/jats:p>","DOI":"10.1021\/acsami.6c14644","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T19:02:08Z","timestamp":1791572528000},"page":"56622-56633","source":"Crossref","is-referenced-by-count":0,"title":["A High-Biocompatibility, Anticounterfeiting, Flexible Dielectric Energy Storage Film Enabled by Multiple Structure Optimization Strategies"],"prefix":"10.1021","volume":"18","author":[{"given":"Yisha","family":"Ma","sequence":"first","affiliation":[{"name":"Shaanxi University of Science and Technology , , ,","place":["Xi\u2019an, Shaanxi, China, 710021"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6293-906X","authenticated-orcid":true,"given":"Haijun","family":"Wang","sequence":"additional","affiliation":[{"name":"Shaanxi University of Science and Technology , , ,","place":["Xi\u2019an, Shaanxi, China, 710021"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jialiang","family":"Liu","sequence":"additional","affiliation":[{"name":"Shaanxi University of Science and Technology , , ,","place":["Xi\u2019an, Shaanxi, China, 710021"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5712-1095","authenticated-orcid":true,"given":"Tong","family":"Wang","sequence":"additional","affiliation":[{"name":"Shaanxi University of Science and Technology , , ,","place":["Xi\u2019an, Shaanxi, China, 710021"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8003-2739","authenticated-orcid":true,"given":"Jian","family":"Hu","sequence":"additional","affiliation":[{"name":"Qingdao University of Science & Technology , , ,","place":["Qingdao City, China, 266042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoli","family":"Sun","sequence":"additional","affiliation":[{"name":"Beijing University of Chemical Technology , ,","place":["Beijing, China, 102300"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,9]]},"reference":[{"key":"2026102108062749200_cit1","doi-asserted-by":"publisher","first-page":"12169","DOI":"10.1002\/er.5825","article-title":"Enhanced discharged energy density in poly(vinylidene fluoride) composites with a small loading of (K0.5Na0.5)NbO3 particles","volume":"44","author":"Li","year":"2020","journal-title":"Int. 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