This product is developed for advanced anode material research in sodium-ion batteries. The carbon molecular sieve from Iwatani features a predominantly microporous structure with pore sizes around 0.3–0.5 nm and no mesopores, enabling effective sodium ion transport and storage. Designed as a sodium negative electrode material, it demonstrates high initial efficiency and good cycling stability, making it suitable for long-cycle-life battery studies. The material also exhibits carbon dioxide adsorption properties, which may support dual-function electrode designs or gas capture applications. Offered in various gram sizes for laboratory-scale evaluation, this carbon molecular sieve provides a reliable platform for investigating hard carbon-like anodes in next-generation energy storage systems.