Heterostructure CuSe/MnSe2 with Se vacancies for rapid ion kinetics for low-temperature sodium-ion batteries

Herein, a CuSe/MnSe₂ heterostructure with Se vacancies is fabricated as an ultrafast anode for low-temperature sodium-ion batteries. It achieves 380.3 mAh g^-1 after 1500 cycles (3.0 A g^-1) and 403.6 mAh g^-1 at -30 °C (0.5 A g^-1), highlighting exceptional cyclability and low-temperature adaptability.