Boost Anion Storage Capacity Using Conductive Polymer as a Pseudocapacitive Cathode for High-Energy and Flexible Lithium Ion Capacitors
Boost Anion Storage Capacity Using Conductive Polymer as a Pseudocapacitive Cathode for High-Energy and Flexible Lithium Ion Capacitors
复制标题
使用导电聚合物作为高能柔性锂离子电容器的赝电容阴极来提高阴离子存储容量
DOI：
10.1021/acsami.9b22081
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发表时间：
2020-03-04
影响因子：
9.5
通讯作者：
Wang, Guoxiu
中科院分区：
文献类型：
--
作者：
Han, Cuiping;Tong, Jing;Wang, Guoxiu
Current lithium ion capacitors (LICs) have been severely plagued by the insufficient anion storage capacity of porous carbon. This work reports the exploration of conductive polyaniline (PANi) as an anion intercalation cathode to enhance the PF6- storage via fast doping/undoping reactions. The PANi is electrodeposited on an electrospun carbon nanofiber (CNF) textile (denoted as PANi@CNF), which not only provides a robust support for PANi to increase its pseudocapacity but also renders a free-standing architecture for flexible devices. The PANi@CNF composite with a dominant capacitive storage characteristic reveals high specific capacities of 158.5 mAh g(PANi)(-1) at 1 A g(-1) and 118.5 mAh g(PANi)(-1) even at 20 A g(-1), which significantly surpasses state-of-the-art porous carbons. First-principle calculations revealed the coordination of PF6- anions with -NH groups of PANi(+) via F atoms through ion-dipole electrostatic interaction, which are accompanied by electron transfer. By pairing with CNF as an anode, a thin and flexible LIC was assembled, which achieves maximum energies of 106.5 Wh kg(-1) under 769.0 W kg(-1) and 64.5 Wh kg(-1) under a super high power of 15087.1 W kg(-1), together with an impressive cycling stability of 70.3% after 9000 cycles at 10 A g(-1). These findings provide a facile strategy for high-energy and flexible LICs via anion storage pseudocapacitive materials.
