Liu Ying, Xie Luoyuan, Zhang Wang, Dai Ziwen, Wei Wei, Luo Shaojuan, Chen Xian, Chen Wei, Rao Feng, Wang Lei, Huang Yang
College of Materials Science and Engineering , Shenzhen University , Shenzhen 518055 , China.
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering , Shenzhen University , Shenzhen 518060 , China.
ACS Appl Mater Interfaces. 2019 Aug 28;11(34):30943-30952. doi: 10.1021/acsami.9b09802. Epub 2019 Aug 13.
Owing to its electronic conductivity and electrochemical reactivity, polyaniline (PANI) can serve as the cathode for rechargeable zinc-ion batteries (ZIBs). However, it suffers from fast deactivation and thus performance deterioration because of spontaneous deprotonation during charge/discharge. Here, we report an effective strategy to improve the electrochemical reactivity and stability of the PANI-based cathode by constructing a π-electron conjugated system between PANI and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) on carbon nanotubes (CNTs). The impressive performance of the post-treated CNTs-PANI-PEDOT:PSS (t-CNTs-PA-PE) cathode is largely attributed to the -SOH groups in PSS, which acts as an 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, the t-CNTs-PA-PE cathode achieves a high capacity of 238 mA h g, together with good rate capability and long-term stability (over 1500 cycles with 100% Coulombic efficiency). Through exerting the freestanding 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 cathodes for high-performance ZIBs, fulfilling the need of flexible electronics.
由于具有电子导电性和电化学反应活性，聚苯胺（PANI）可作为可充电锌离子电池（ZIBs）的阴极。然而，由于在充放电过程中会发生自发去质子化，它会迅速失活，进而导致性能下降。在此，我们报道了一种有效的策略，通过在碳纳米管（CNTs）上的聚苯胺和聚（3,4 - 乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT:PSS）之间构建一个π电子共轭体系，来提高基于聚苯胺的阴极的电化学反应活性和稳定性。后处理的碳纳米管 - 聚苯胺 - 聚（3,4 - 乙撑二氧噻吩）聚苯乙烯磺酸盐（t - CNTs - PA - PE）阴极令人印象深刻的性能很大程度上归因于聚苯乙烯磺酸盐中的 - SOH基团，它作为一个内部质子库，为聚苯胺的质子化提供足够的H，从而促进其电化学活性和可逆性。此外，聚苯胺和聚（3,4 - 乙撑二氧噻吩）聚苯乙烯磺酸盐之间的强相互作用有助于π - π共轭链的伸展，从而提高电子导电性。因此，t - CNTs - PA - PE阴极实现了238 mA h g的高容量，同时具有良好的倍率性能和长期稳定性（在100%库仑效率下超过1500次循环）。通过使用独立的t - CNTs - PA - PE，进一步构建了一种具有出色电化学性能和卓越高安全性的柔性锌离子电池。这项工作证明了导电聚合物阴极用于高性能锌离子电池的可行性，满足了柔性电子学的需求。
