Accelerated Sulfur Redox Kinetics on Transition Metal Sulfide Electrocatalysts by Modulating Electronic‐State of Active Sites

Abstract Lithium‐sulfur (Li‐S) batteries are considered a competitive next‐generation electrochemical energy storage device, while the shuttle effect of soluble lithium polysulfides (LiPSs) resulting from the sluggish redox kinetics severely impedes their practical applications. Herein, a novel cation doping strategy is demonstrated for substantially accelerating the sulfur redox kinetics on the transition metal sulfide (TMS) electrocatalysts by partially substituting cobalt atoms with in situ dissolved Ni dopants (Ni x Co 3‐x S 4 , 0