Porous current collector enables carbon superior electrochemical performance for K-ion capacitors

作     者：Mei-Qi Liu Hui-Ming Li Zai-Yuan Le Jin-Fu Zhao Li-Min Chang Luan Fang Mei-Qi Hou Hai-Rui Wang Tian-Hao Xu Ping Nie Mei-Qi Liu;Hui-Ming Li;Zai-Yuan Le;Jin-Fu Zhao;Li-Min Chang;Luan Fang;Mei-Qi Hou;Hai-Rui Wang;Tian-Hao Xu;Ping Nie

作者机构：Key Laboratory of Preparation and Applications of Environmental Friendly Material of the Ministry of EducationCollege of ChemistryJilin Normal UniversityChangchun130103China Department of Chemical and Biomolecular EngineeringUniversity of CaliforniaLos AngelesCA90095USA 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2023年第42卷第1期

页      面：134-145页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0703[理学-化学] 

基　　金：financially supported by the National Key Research and Development Program of China(No.2017YFE0198100) the National Natural Science Foundation of China(Nos.52072145 and 51802111) the Research Program on Science and Technology from the Education Department of Jilin Province(Nos.JJKH20220439KJ and JJKH20210450KJ) Jilin Talent Development Funding(No.2021Y027) the Funding of Jilin Province Development and Reform Commission(No.2020C026-2) Special Projects of the Central Government in Guidance of Local Science and Technology Development(No.202002017JC) Funding of JLNU Innovation Program for Graduate Education(No.202016)。 

主　　题：Porous copper Current collector Anode Carbon anode Potassium-ion capacitor(PIC) 

摘      要：The current collector is an indispensable component in potassium-ion hybrid capacitors,which not only provides mechanical support to load electrode materials,but also collects and outputs the current generated.Herein,we investigate the effect of three different current collectors on the electrochemical properties of potassium ion capacitors using carbon black anode as a demonstration.Because of better adhesion and lower charge transfer resistance,the specific capacity of half-cells assembled using three-dimensional(3D)porous copper foil(PCu)and copper as current collector is better than that of Al foil,which stabilizes at 138.2 and 132.8 mAh·g^(-1)after 100 cycles at 0.05 A·g^(-1).The potassium-ion capacitor assembled using PCu exhibits an excellent energy/power density of 86.1 Wh·kg^(-1)and 4000 W·kg^(-1),respectively.This work will boost the rational design and provide an effective strategy to improve the performance of potassium-ion capacitors.