A Conjugated System of PEDOT:PSS Induced Self-doped PANI for Flexible Zinc-Ion Batteries with Enhanced Capacity and Cyclability.

Owing to its electronic conductivity and electrochemical reactivity, polyaniline (PANI) can serve as cathode for rechargeable zinc-ion batteries (ZIBs). However, it suffers from fast deactivation and thus performance deterioration due to spontaneous de-protonation during charge/discharge. Here, we report an effective strategy to improve the electrochemical reactivity and stability of PANI based cathode by constructing a π-electron conjugated system between PANI and PEDOT:PSS on CNTs. The impressive performance of post-treated CNTs-PANI-PEDOT:PSS (t-CNTs-PA-PE) cathode is largely attributed to the -SO3-H+ groups in PSS, which acts as internal proton reservoir and provides enough H+ for PANI's protonation, thus promoting its electrochemical activity and reversibility. Besides, the strong interactions between PANI and PEDOT:PSS assist the stretching of π-π conjugation chains, bringing about enhanced electronic conductivity. Consequently, t-CNTs-PA-PE cathode achieves a high capacity of 238 mAh g-1, together with good rate capability and long-term stability (over 1500 cycles with 100% columbic efficiency). Through exerting the free-standing t-CNTs-PA-PE, a flexible ZIB was further constructed with both outstanding electrochemical properties and superior high safety. This work demonstrates the availability of conducting polymer cathode for high-performance ZIBs, fulfilling the need of flexible electronics.

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