Amorphous carbon, particularly hard carbon (HC), is widely considered as the most promising anode material for sodium-ion batteries (SIBs) due to its high reversible capacity and cost-effectiveness. However, the complex and poorly defined structural properties of HC present challenges in understanding the underlying sodium storage mechanisms. To facilitate the rational design of high-performance HC anodes, a comprehensive understanding of the correlation between microstructure and sodium storage behavior is critical. This Review critically examines the interplay between the structural features...
