BLOCK COPOLYMER-DIRECTED THREE-DIMENSIONAL CARBON-BASED MATERIALS FOR SODIUM-ION ELECTROCHEMICAL ENERGY STORAGE DEVICES
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Three-dimensionally (3D) nanoarchitectured carbons offer great promise for next-generation electrochemical energy storage by providing large surface area and interconnected pathways for efficient ion and electron transport. Block copolymer self assembly-directed carbons offer a solution-processible, scalable route to generating such materials. However, linear block copolymer (BCP) self-assembly-directed porous carbons remain limited by pore size, and bottlebrush block copolymers that can generate larger domains and pore sizes are limited in morphological control. In this study, linear ultra-large molar mass (ULMM) BCPs were employed to generate tunable porous carbons, including a co-continuous phase favorable for 3D device assembly. The resulting carbon was used to fabricate sodium-ion cells, in which an in-situ solid electrolyte interphase (SEI) was formed upon electrochemical discharge to serve as the separator. This strategy enables a scalable, all-organic, and electrochemical modular approach to high-surface-area interface energy storage platforms.