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However, polyetherimide (PEI), one of the most promising candidate materials, suffers from significant deterioration in energy storage density due to high conductive loss under high temperatures. In this study, we designed a polymer alloy comprising PEI and semi\u2010aromatic benzimidazole polyimide (SPBII), where intermolecular hydrogen bonding acts as a compatibilizer to stabilize a nanoscale microphase\u2010separated structure. The SPBII polymer chains confined within nanoregions exhibit a nanoconfinement effect, substantially enhancing the thermal and mechanical properties of the polymer alloy, with\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>g<\/jats:sub>\n                    and Young's modulus of 50% SPBII reaching\u00a0287.5\u00b0C and 5.32 GPa. Furthermore, the high positive electrostatic potential of SPBII introduces charge traps at the PEI\/SPBII interface, effectively suppressing high\u2010temperature conduction loss. As a result, the 50% SPBII polymer alloy demonstrates remarkable improvements in breakdown strength and energy storage density. For instance, at 200\u00b0C, it achieves an energy density of 4.53 J cm\n                    <jats:sup>\u22123<\/jats:sup>\n                    with an efficiency of 90%, outperforming that of\u00a0pure PEI (1.71 J cm\n                    <jats:sup>\u22123<\/jats:sup>\n                    ). This breakthrough provides a promising solution for achieving superior capacitive performance of dielectrics under high\u2010temperature conditions, significantly advancing the applications of polyimide\u2010based dielectric materials.\n                  <\/jats:p>","DOI":"10.1002\/smll.202512357","type":"journal-article","created":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T11:44:56Z","timestamp":1767872696000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Microphase Separation Promoting High\u2010Temperature Energy Storage Properties of Polymer Alloys"],"prefix":"10.1002","volume":"22","author":[{"given":"Xiaona","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory of Powder Metallurgy Central South University  Changsha Hunan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ru","family":"Guo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Powder Metallurgy Central South University  Changsha Hunan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haiyan","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Energy and Power Engineering Changsha University of Science and Technology  Changsha Hunan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongna","family":"Yan","sequence":"additional","affiliation":[{"name":"College of Energy and Power Engineering Changsha University of Science and Technology  Changsha Hunan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuefan","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Powder Metallurgy Central South University  Changsha Hunan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fan","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Powder Metallurgy Central South University  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