Ultrahigh Loading Electrode in High-Energy-Density Lithium Batteries In their Research Article (DOI: 10.1002/adma.202506266), Soojin Park, Youn Soo Kim, and co-workers design an ionically conductive elastic polymer (ICEP) binder that is introduced for fabricating ultrahigh mass-loading NCM811 cathodes, offering enhanced elasticity, adhesion, and ionic conductivity for improved structural and interfacial stability. The cathode, with 62.5 mg cm−2 (12.7 mAh cm−2), delivers 377.6 Wh kgcell−1/1016.8 Wh Lcell−1 (including packaging) when paired with Li metal anodes, demonstrating excellent electrochemical stability.