Interfacial/bulk synergetic effects accelerating charge transferring for advanced lithium-ion capacitors  

作　　者：Chang Liu Zirui Song Xinglan Deng Shihong Xu Renji Zheng Wentao Deng Hongshuai Hou Guoqiang Zou Xiaobo Ji 

机构地区：[1]School of Chemistry and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China [2]College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China [3]Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources,School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

出　　处：《Chinese Chemical Letters》2024年第6期168-175,共8页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52004338,22378431);Hunan Provincial Natural Science Foundation(Nos.2022JJ20075,2023JJ40210);Scientific Research Fund of Hunan Provincial Education Department(No.21B0017);Central South University Innovation-Driven Research Programme(No.2023CXQD008)。

摘　　要：The exploration of advanced materials through rational structure/phase design is the key to develop highperformance lithium-ion capacitors(LICs).However,high complexity of material preparation and difficulty in quantity production largely hinder the further development.Herein,Cu_(5)FeS_(4-x)/C(CFS@C)heterojunction with rich sulfur vacancies has successfully achieved from natural bornite,presenting low costeffective and bulk-production prospect.Density functional theory(DFT)calculations indicate that rich vacancies in bulk phase can decrease band gap of bornite and thus improve its intrinsic electron conductivity,as well as the heterojunction spontaneously evokes a built-in electric field between its interfacial region,largely reducing the migration barrier from 1.27 e V to 0.75 e V.Benefited from these merits,the CFS@C electrodes deliver outperformed lithium storage performance,e.g.,high reversible capacity(822.4m Ah/g at 0.1 A/g),excellent cycling stability(up to 820 cycles at 2 A/g and 540 cycles at 5 A/g with respective capacity retention of over or nearly 100%).With CFS@C as anode and porous carbon nanosheets(PCS)as cathode,the assembled CFS@C//PCS LIC full cells exhibit high energy/power density characteristics of 139.2 Wh/kg at 2500 W/kg.This work is expected to offer significant insights into structure modifications/devising toward natural minerals for advanced energy-storage systems.

关 键 词：Bulk/interfacial modification HETEROSTRUCTURE Sulfur vacancies Lithium ion capacitors Capacitors 

分 类 号：TM53[电气工程—电器]