Regulating the oxygen-atom configuration of carbon anode enabling extremely fast-charging potassium-ion hybrid capacitors  

作　　者：Daping Qiu Yuehui Wang Lulu Zhang Hang Lei Haizhou Ying Jin Niu Min Li Xuelin Yang Feng Wang Ru Yang 

机构地区：[1]Hubei Provincial Collaborative Innovation Center for New Energy Microgrid,College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China [2]State Key Laboratory of Chemical Resource Engineering,Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing 100029,China [3]College of Materials and Chemical Engineering,China Three Gorges University,Yichang 443002,China

出　　处：《Nano Research》2025年第1期373-381,共9页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2022YFB3807700);the National Natural Science Foundation of China(Nos.52072217,22179071,U20A20337,52130206 and 52402278);the Hubei Natural Science Foundation Innovation Group Project(No.2022CFA020);Joint Funds of the Hubei Natural Science Foundation Innovation and Development(No.2022CFD034);the Yichang Natural Science Research Project(No.A24-3-013);the Science Foundation of China Three Gorges University(No.2023RCKJ0021).

摘　　要：Metal-ion hybrid capacitors,such as potassium-ion hybrid capacitors(PIHCs),are regarded as promising fast-charging energy storage devices.However,the kinetics mismatch between the battery anode and the capacitive cathode restricts their fastcharging performance.Precisely constructing carbon anodes with enhanced kinetics is an innovative approach to address this challenge.Herein,using epigallocatechin gallate with high oxygen content as the precursor,oxygen-enriched carbon materials(OEC)with tunable C=O content are successfully synthesized.Effortlessly,the C=O content of OEC is regulated by adjusting the pyrolysis temperature.Serving as an anode for PIHCs,OEC-600 with the highest C=O content exhibits an attractive fast-charging specific capacity of 135.2 mAh·g^(-1)at 20 A·g^(-1),along with a superior fast-charging cycling stability.Combining theoretical calculations,comprehensive kinetics analysis and in-situ Raman,the positive effects of C=O on the potassium storage capability and reversibility of OEC-600 are revealed.Consequently,PIHCs assembled based on an OEC-600 anode deliver impressive energy/power density of 145.1 Wh·kg^(-1)/45.9 kW·kg^(-1)and superior fast-charging cycling stability with 87.5%of capacity retention over 20,000 cycles at 5 A·g^(-1).This work is anticipated to provide an optional design concept toward the carbon anode for fast-charging PIHCs.

关 键 词：carbon ANODE oxygen epigallocatechin gallate potassium-ion hybrid capacitor 

分 类 号：TM53[电气工程—电器]