“…Herein, the cycling behavior of the K-Co-Mn-F electrodes showed an increasing trend during the first few hundreds of cycles and then becameb asically stable, which is largely due to the activation process of the electrode materials.T he K-Co-Mn-F candidates are typical battery-type materials with comparatively larger particle size (0.1-2 mm), and therefore the large portions of electroactive sites cannot be effectively used initially,w hich need to be acti-vated before reaching am ore stable state, and similarp henomenah ave been also reported in the literature. [31][32][33] More significantly,t he profound performance of the perovskite K-Co-Mn-F (Co/Mn = 6:1) candidate (113-100 Cg À1 or 226-192Fg À1 at 1-16 Ag À1 ,1 18 %r etention for 5000cycles at 8Ag À1 )o utdoes many state-of-art perovskite oxide electrode materials for supercapacitors (Table S1), for example, SrMn 0.2 Ru 0.8 O 3 , [6] BiFeO 3 , [7] TiO 2 /BiFeO 3 , [8] LaNiO 3 , [9] LaMO 3 (M = Ni, Mn, Fe, Cr), [10] LaNiO 3 /NiO, [11] La 0.85 Sr 0.15 MnO 3-d , [13] (La 0.75 Sr 0.25 ) 0.95 MnO 3-d , [14] etc., largely demonstrating the advantages of the new-type bimetallic CoÀMn perovskite fluorides for supercapacitors.…”