Kinetically accelerated and high-mass loaded lithium storage enabled by atomic iron embedded carbon nanofibers  

作　　者：Qian Xu Yanan Li Chenghao Wu Xitong Sun Qiang Li Huabin Zhang Le Yu Yuanyuan Pan Yujuan Wang Shiwei Guo Mengdi Zhang Han Hu Mingbo Wu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,Institute of New Energy,College of Chemistry and Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]College of Physics,Center for Marine Observation and Communications,Qingdao University,Qingdao 266071,China [3]KAUST Catalysis Center(KCC),Physical Sciences and Engineering Division,King Abdullah University of Science and Technology(KAUST),Thuwal 23955-6900,Saudi Arabia [4]Beijing Advanced Innovation Center for Soft Matter Science and Engineering,State Key Lab of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Nano Research》2022年第7期6176-6183,共8页纳米研究（英文版）

基　　金：The authors acknowledge the financial support from the National Natural Science Foundation of China(Nos.21975258,22179145,and 22138013);the startup support grant from China University of Petroleum(East China);Shandong Provincial Natural Science Foundation(No.ZR2020ZD08).

摘　　要：Carbonaceous materials represent the dominant choice of materials for anodic lithium storage in many energy storage devices.Nevertheless,the nonpolar carbonaceous materials offer weak adsorption toward Li+that largely denies the high-rate Li+storage.Herein,the atomic Fe sites decorated carbon nanofibers(AICNFs)facilely produced by electrospinning are reported for kinetically accelerated Li+storage.Theoretical calculation reveals that the atomic Fe sites possess coordination unsaturated electronic configuration,enabling suitable bonding energy and facilitated diffusion path of Li+.As a result,the optimal structure displays a high capacitive contribution up to 95.9%at a scan rate of 2.0 mV·s^(−1).In addition,ultrahigh capacity retention of 97%is afforded after 5,000 cycles at a current density of 3 A·g^(−1).Moreover,the interlaced fiber structure enabled by electrospinning benefits structural stability and improved conductivity even at thick electrodes,thus allowing a high areal capacity of 1.76 mAh·cm−2 at a loading of 8 mg·cm−2.Because of these structure and performance merits,the lithium-ion capacitor containing the AICNF-based anode delivers a high energy density and large power density.

关 键 词：atomic iron PSEUDOCAPACITANCE high-mass loading ELECTROSPINNING lithium storage 

分 类 号：TM912[电气工程—电力电子与电力传动] TB3[一般工业技术—材料科学与工程]