 The study investigates the formation mechanism of closed pores in hard carbon anodes for sodium-ion batteries using waste wood as a template, revealing that high-crystallinity cellulose in nature would decomposes to long-range carbon layers as the wall of closed pore and amorphous component can hinder graphitization and induce crispation of long-range carbon layers. The optimized sample exhibits high reversible capacity, rate, and stable cycling performances. This article was authored by Zhentang, Rui Zhong, Haiyong Wang, and others.