Notably, the capacity of CP1 outperforms 2 after 45 cycles, and a new trend 1 ˂ 2 ˂ CP1 ˂ CP2 occurs during cycles 45-240. These results suggest that conjugated polymers deliver the best cycling stability, resulting from high electrochemical activity and effective suppression of dissolution. We attribute the highest capacity observed for CP2 to the introduction of benzothiadiazole unit as an additional redox center, which has already been demonstrated in our previous work. Moreover, their Coulombic efficiencies are close to 100% in all cases, verifying the high reversible redox stability of the carbonylpyridinium units. Overall, the varying dissolution behavior of the four materials agrees well with their different cycling performance, thus leading us to believe that unfavorable dissolution (and not chemical decomposition of the materials) is the dominating factor in capacity fading.