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Herein, a 3D branched polyimide binder with superior elasticity and ion conductivity is synthesized through the copolymerization of 3,3',4,4'\u2010biphenyltetracarboxylic dianhydride (BPDA) with tough 4,4'\u2010oxydianiline (ODA), polar isophthalic dihydrazide (IDP), and flexible poly(dimethylsiloxane)etherimide (DMS), while incorporating branched 1,3,5\u2010tris(4\u2010aminophenoxy)benzene (TAPOB) to construct a robust 3D crosslinked network. The 3D network of mPI\u2010T contains abundant aromatic benzene rings, providing high toughness and structural stability. The incorporation of IDP introduces numerous polar amide groups, which enhance the formation of robust interactions with the surfaces of SiO\n                    <jats:sub>x<\/jats:sub>\n                    . Additionally, the flexible Si\u2010O\u2010Si segments in DMS contribute exceptional elasticity, effectively preserving the structural integrity of the electrode while facilitating Li\u207a transport. The SiO\n                    <jats:sub>x<\/jats:sub>\n                    @mPI\u2010T electrode exhibits excellent cycling stability, achieving an unprecedented capacity retention of 88% after 600 cycles at 1C. Moreover, the Si\/C@mPI\u2010T electrode demonstrates remarkable long\u2010term cycling stability with an exceptionally low capacity decay rate of 0.038% per cycle after 1000 cycles. The full cell of the SiO\n                    <jats:sub>x<\/jats:sub>\n                    @mPI\u2010T\/\/NCM811 exhibits a remarkable capacity retention of 83.1% after 200 cycles, highlighting the potential of the 3D highly elastic PI binder with superior elasticity and ion conductivity for high\u2010energy\u2010density LIBs.\n                  <\/jats:p>","DOI":"10.1002\/smll.202507023","type":"journal-article","created":{"date-parts":[[2025,8,7]],"date-time":"2025-08-07T11:14:44Z","timestamp":1754565284000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Structurally Adaptive Branched Polyimide Binder with Synergistic Elastic Buffering and Ionic Transport for Long\u2010Term Stability of Silicon Anodes"],"prefix":"10.1002","volume":"21","author":[{"given":"Yongjun","family":"Kang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fangzhou","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jialun","family":"Yin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daolei","family":"Lin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bingxue","family":"Liu","sequence":"additional","affiliation":[{"name":"China Automotive Battery Research Institute Co., Ltd.  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