Highly Stable S ²⁻ ‐Doped‐rGO@Fe _2.57 Mn _0.43 O ₄ @C Hybrid Heterostructures by Sulfur‐ Doping of Graphene‐Coated 3D Fe _2.57 Mn _0.43 O ₄ Nanorods on rGO Nanosheets for High‐

Multicomponent transition metal heterostructures is constructed through a heteroatomic doping method sandwiched by the dual carbon layers. The promising strategy combines iron and manganese ions into a novel Fe_2.57Mn_0.43O₄ heterostructure on the surface of the rGO nanosheets, followed by sulfur-doping and calcination processes to achieve S^2--doped-rGO@Fe_2.57Mn_0.43O₄@C heterostructure. Note that S^2--doped Fe_2.57Mn_0.43O₄ nanorods encapsulated by the carbon coating layers on the rGO nanosheets as the backbone are expected to restrict nanorods from collapsing during the charge-discharge processes. The S^2--doping in heterostructures can build stabilized solid electrolyte interphase on or near the surface of the Fe_2.57Mn_0.43O₄ nanorods. Moreover, Mn heteroatomic doping can optimize the crystalline structure of the Fe_2.57Mn_0.43O₄. The exposed active sites and kinetics of S^2--doped-rGO@Fe_2.57Mn_0.43O₄@C heterostructure are significantly improved. As a result, the as-assembled batteries can achieve a high capacitance of 1410 F g^-1 at 1 A g^-1 with a high capacitance retention of 75% at 16 A g^-1. Furthermore, the batteries are guaranteed a prolonged cycle life of 1000 cycles with 92.3% capacitance retention. The as-assembled NiAl-LDH (Ni-Al layered double hydroxide)//S^2--doped-rGO@Fe_2.57Mn_0.43O₄@C battery leads to excellent electrochemical properties (65.4 Wh kg^-1 at 763.2 W kg^-1, 9925.8 W kg^-1 at a 43.9 Wh kg^-1).