High‑Energy and High‑Power Pseudocapacitor–Battery Hybrid Sodium‑Ion Capacitor with Na^(+) Intercalation Pseudocapacitance Anode  

作　　者：Qiulong Wei Qidong Li Yalong Jiang Yunlong Zhao Shuangshuang Tan Jun Dong Liqiang Mai Dong‑Liang Peng 

机构地区：[1]Department of Materials Science and Engineering,Fujian Key Laboratory of Materials Genome,College of Materials,Xiamen University,Xiamen 361005,People’s Republic of China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,People’s Republic of China [3]Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,People’s Republic of China [4]Advanced Technology Institute,University of Surrey,Guildford Surrey GU27XH,UK

出　　处：《Nano-Micro Letters》2021年第3期209-221,共13页纳微快报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.22005256);the National Key R&D Program of China(Grant No.2016YFA0202600);the Natural Science Foundation of Fujian Province of China(No.2020J01034).

摘　　要：High-performance and low-cost sodium-ion capacitors(SICs)show tremendous potential applications in public transport and grid energy storage.However,conventional SICs are limited by the low specific capacity,poor rate capability,and low initial coulombic efficiency(ICE)of anode materials.Herein,we report layered iron vanadate(Fe5V15O39(OH)9·9H2O)ultrathin nanosheets with a thickness of~2.2 nm(FeVO UNSs)as a novel anode for rapid and reversible sodium-ion storage.According to in situ synchrotron X-ray diffractions and electrochemical analysis,the storage mechanism of FeVO UNSs anode is Na+intercalation pseudocapacitance under a safe potential window.The FeVO UNSs anode delivers high ICE(93.86%),high reversible capacity(292 mAh g^−1),excellent cycling stability,and remarkable rate capability.Furthermore,a pseudocapacitor–battery hybrid SIC(PBH-SIC)consisting of pseudocapacitor-type FeVO UNSs anode and battery-type Na3(VO)2(PO4)2F cathode is assembled with the elimination of presodiation treatments.The PBH-SIC involves faradaic reaction on both cathode and anode materials,delivering a high energy density of 126 Wh kg^−1 at 91 W kg^−1,a high power density of 7.6 kW kg^−1 with an energy density of 43 Wh kg−1,and 9000 stable cycles.The tunable vanadate materials with high-performance Na+intercalation pseudocapacitance provide a direction for developing next-generation highenergy capacitors.

关 键 词：Sodium-ion capacitors PSEUDOCAPACITANCE Hybrid capacitors Two-dimensional materials Iron vanadate 

分 类 号：TM53[电气工程—电器]