At a low current density of 0.2 A g -1 , electrodes based on 1, 2, CP1, and CP2 exhibited stable discharge capacities of 350, 520, 360, and 520 mAh g -1 , respectively. The discharge capacities monotonically decrease with increasing current densities but more drastically in the case of two small molecules 1 and 2. The detailed data are summarized in Table . This observation could be attributed to kinetic factors, such as lithium-ion diffusion and electron-transfer rates that limit the amount of charge extracted from the electrode at higher currents. Impressively, the two conjugated polymers again display superior rate performances than the small molecules. Relative to their specific capacity at 0.2 A g -1 , their capacity retentions at 1 and 5 A g -1 are 46 % and 22 % for 1, 50 % and 22 % for 2, 64 % and 40 % for CP1, 70 % and 44 % for CP2, respectively. Although CP1 displays lower capacity than 2 at low current densities (˂ 1 A g -1 ), it catches up with increasing current, which is consistent with the observed cycling performance. The excellent rate performance of the conjugated polymers is not only the result from their absolute insolubility, but also their enhanced electronic conductivity. In addition, their amorphous morphology in the microscale range probably allows the full utilization of the redoxactive sites and also minimizes diffusion length for the transport of ions/electrons, thus delivering a higher actual capacity and enhanced rate performance. Importantly, when the current density is shifted back from 5 A g -1 to 0.2 A g -1 , nearly quantitative recovery of the initial capacities is observed in all the cases, demonstrating the superior stability. Overall, the stepwise improvement of the rate performance and cycling stability on going from 1 via 2 to CP1 and finally CP2, is consistent with their inherent electrical conductivity, solubility, and morphology. Impressively, CP2 delivers not only the highest capacity but also the best cycling stability (Figure ), suggesting high electrochemical activity and effective suppression of dissolution.