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However, their development is constrained by the lack of high\u2010capacity and durable anodes capable of accommodating the large\u2010radius K\n                    <jats:sup>+<\/jats:sup>\n                    . Herein, a small\u2010molecule organic compound, 2,2\u2032\u2010bipyridine\u20104,4\u2032\u2010dicarboxylic acid (BDA), is presented as a promising anode for PIBs. The cooperative multielectron redox activity of the carbonyl and imine moieties affords a high reversible capacity, while the conjugated framework and dense molecular packing strengthen the structural stability. Consequently, BDA delivers a specific capacity of 398 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 100\u00a0mA g\n                    <jats:sup>\u22121<\/jats:sup>\n                    and retains 186 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    after 1000 cycles at 1000\u00a0mA g\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Combined in situ\n                    <jats:italic>\/<\/jats:italic>\n                    ex situ characterizations and theoretical calculations reveal that pristine BDA undergoes an irreversible deprotonation\/potassiation during the initial discharge, generating an activated K\n                    <jats:sub>2<\/jats:sub>\n                    BDA phase. The subsequent reversible K\u2010storage is dominated by the carbonyl and imine sites, and involves only minor lattice variation, which accounts for the low volume fluctuation and outstanding cycling stability. In addition, an all\u2010organic PIB assembled with a pre\u2010potassiated BDA anode and a PTCDA cathode delivers a high energy density of 174\u00a0Wh kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    (based on the mass of both electrodes). This study establishes a viable small\u2010molecule organic anode for high\u2010performance PIBs.\n                  <\/jats:p>","DOI":"10.1002\/smll.74912","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T09:15:39Z","timestamp":1785230139000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Four\u2010Electron\u2010Transfer Robust Small\u2010Molecule Organic Anode for Low\u2010Strain Potassium Storage"],"prefix":"10.1002","volume":"22","author":[{"given":"Guangwan","family":"Zhang","sequence":"first","affiliation":[{"name":"The Sanya Science and Education Innovation Park of Wuhan University of Technology  Sanya People's Republic of China"},{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanjiao","family":"Teng","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kang","family":"Han","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuhan","family":"Jin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenli","family":"Shu","sequence":"additional","affiliation":[{"name":"The Sanya Science and Education Innovation Park of Wuhan University of Technology  Sanya People's Republic of China"},{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenhang","family":"Zhong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai","family":"Luo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0169-9928","authenticated-orcid":false,"given":"Lianmeng","family":"Cui","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianwei","family":"Li","sequence":"additional","affiliation":[{"name":"Zhongyu Feima New Material Technology Innovation Center (Zhengzhou) Co., Ltd. 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