Correction to: K doping stabilizes three-dimensional K0.2Na1.3Mn0.5O2-d as high-performance cathode for sodium-ion batteries (Rare Metals, (2024), 10.1007/s12598-024-02814-6)

In the original publication, incorrect title characters were published. The problem is the "-d" in the title and the Experimental section in the text, which should be "-delta" (Greek letter). The corrected title is as follows: K doping stabilizes three-dimensional K0.2Na1.3Mn0.5O2-δ as high-performance cathode for sodium-ion batteries "2D Na1.3Mn0.7O2 (NMO) and 3D K0.2Na1.3Mn0.5O2-d (KNMO) were prepared by the solid-state sintering reaction" in Section 2.1 should be"2D Na1.3Mn0.7O2 (NMO) and 3D K0.2Na1.3Mn0.5O2-δ (KNMO) were prepared by the solid-state sintering reaction".