Enhanced K-ion kinetics in a layered cathode for potassium ion batteries

A layered cathode for K-ion storage was achieved using electrochemical ion-exchange. It delivers a large specific capacity, superior rate performance and excellent cycling performance. Interestingly, it was found from the GITT results that the K ion diffusion coefficients were above 10(-12) cm(2) s(-1), comparable with that of Na-ion in the layered structure.