High-Energy and High-Power Nonaqueous Lithium-Ion Capacitors Based on Polypyrrole/Carbon Nanotube Composites as Pseudocapacitive Cathodes
High-Energy and High-Power Nonaqueous Lithium-Ion Capacitors Based on Polypyrrole/Carbon Nanotube Composites as Pseudocapacitive Cathodes
复制标题
基于聚吡咯/碳纳米管复合材料作为赝电容阴极的高能高功率非水锂离子电容器
DOI：
10.1021/acsami.9b02781
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发表时间：
2019-05-01
影响因子：
9.5
通讯作者：
Li, Baohua
中科院分区：
文献类型：
--
作者：
Han, Cuiping;Shi, Ruiying;Li, Baohua
The energy density of present lithium-ion capacitors (LICs) is greatly hindered by the limited specific capacities of porous carbon electrodes. Herein, we report the development of a nonaqueous LIC system by integrating two reversible electrode processes, that is, anion doping/undoping in a core-shell structured polypyrrole/carbon nanotube (Ppy@CNT) composite cathode and Li+ intercalation/deintercalation in a Fe3O4@carbon (C) anode. The hybrid Ppy@CNT is utilized as a promising pseudocapacitive cathode for nonaqueous LIC applications. The Ppy provides high pseudocapacitance via the doping/undoping reaction with PF6- anions. Meanwhile, the CNT backbone significantly enhances the electrical conductivity. The as-developed composite delivers noteworthy capacities with exceptional stability (98.7 mA h g(-1) at 0.1 A g(-1) and retains 89.7% after cycling at 3 A g(-1) for 1000 times in Li-half cell), which outperforms state-of-art porous carbon cathodes in present LICs. Furthermore, when paired with Fe3O4@C anodes, the as-developed LICs demonstrate a superior energy density of 101.0 W h kg(-1) at 2709 W kg(-1) and still maintain 70 W h kg(-1) at an increased power density of 17 186 W kg(-1). The findings of this work provides new knowledge on the cathode materials for LICs.
