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Cationic high-entropy doping was adopted to fabricate the O3-Na0.95Mg0.045Ni0.22Fe0.045Cu0.08Co0.08Ti0.08Mn0.45O2 (HE-NNMO) cathode. The HE-NNMO cathode manifests acceptable Na storage capability, rapid electron transmission, apparent pseudocapacitance effect, and preferable structural integrity. HE-NNMO achieved an initial discharge specific capacity of 142.2 mAh g\u22121 at a current density of 50 mA g\u22121 and maintained a capacity retention rate of 93.0% after 100 cycles at a current density of 500 mA g\u22121. Additionally, it achieved an ultrahigh specific energy of 431.8 Wh kg\u22121 (based on the cathode active material) at a current density of 0.05 A g\u22121, and the Coulombic efficiency reached 89%. Notably, in the full cell, HE-NNMO\/\/H`C maintained capacity retention rates of 78.8% and 65.7% after 200 and 1200 cycles at current densities of 200 mA g\u22121 and 1 A g\u22121, respectively, demonstrating its practical applicability. This study provides insights for the high-entropy design of O3-type layered oxides in sodium-ion batteries.<\/jats:p>","DOI":"10.1021\/acsami.6c13570","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T01:01:30Z","timestamp":1791334890000},"page":"56121-56135","source":"Crossref","is-referenced-by-count":0,"title":["Cationic High-Entropy Doping Endows O3-Type Na-Ni-Mn-O-Layered Cathode with High Energy Density and Sustainable Sodium Storage"],"prefix":"10.1021","volume":"18","author":[{"given":"Yinfeng","family":"Huang","sequence":"first","affiliation":[{"name":"South China Normal University , , ,","place":["Shanwei, China, 516600"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhaochi","family":"Zhang","sequence":"additional","affiliation":[{"name":"South China Normal University , , ,","place":["Shanwei, China, 516600"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuanpu","family":"Zhang","sequence":"additional","affiliation":[{"name":"South China Normal University , , ,","place":["Shanwei, China, 516600"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinghao","family":"Cao","sequence":"additional","affiliation":[{"name":"South China Normal University , , ,","place":["Shanwei, China, 516600"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5559-0090","authenticated-orcid":true,"given":"Jun","family":"Zhang","sequence":"additional","affiliation":[{"name":"Lingnan Normal University , , ,","place":["Zhanjiang, China, 524048"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4757-1065","authenticated-orcid":true,"given":"Francis Chi-Chung","family":"Ling","sequence":"additional","affiliation":[{"name":"The University of Hong Kong , , Pokfulam Road , ,","place":["Hong Kong, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiangwei","family":"Meng","sequence":"additional","affiliation":[{"name":"South China Normal University , , ,","place":["Shanwei, China, 516600"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0468-9821","authenticated-orcid":true,"given":"Qiang","family":"Ru","sequence":"additional","affiliation":[{"name":"South China Normal University , , ,","place":["Shanwei, China, 516600"]},{"name":"South China Normal University , , ,","place":["Guangzhou, China, 510006"]},{"name":"South China Normal University , , ,","place":["Guangzhou, China, 510006"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,6]]},"reference":[{"key":"2026102106074139300_cit1","doi-asserted-by":"publisher","first-page":"1020","DOI":"10.1038\/s41578-021-00324-w","article-title":"Fundamentals, status and promise of sodium-based batteries","volume":"6","author":"Usiskin","year":"2021","journal-title":"Nat. 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