Tang, S., Wang, J., Li, J., Xiang, W., Wang, T., Xiao, Y., Xu, S., Yu, J. S., Pang, H. (2026). Ternary Heterostructures With Gradient Built‐In Electric Fields Through Stepwise Screening for Highly Reversible Sodium Storage at Low Temperature. Advanced Materials. https://doi.org/10.1002/adma.74590