Nitrogen/sulphur dual-doped hierarchical carbonaceous fibers boosting potassium-ion storage  

作　　者：Junzhi Li Junming Cao Xifei Li Junhua Hu Yaohui Zhang Hirbod Maleki Kheimeh Sari Chunxiao Lv IgorVZatovsky Wei Han 

机构地区：[1]Sino-Russian International Joint Laboratory for Clean Energy and Energy Conversion Technology,College of Physics,Jilin University,Changchun 130012,Jilin,China [2]Xi'an Key Laboratory of New Energy Materials and Devices,Institute of Advanced Electrochemical Energy&School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China [3]State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM),Zhengzhou University,Zhengzhou 450001,Henan,China [4]School of Physics,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China [5]Collaborative Innovation Center for Marine Biomass Fibers,Materials and Textiles of Shandong Province,School of Environmental Science and Engineering,Qingdao University,Qingdao 266071,Shandong,China [6]International Center of Future Science,Jilin University,Changchun 130012,Jilin,China

出　　处：《Journal of Energy Chemistry》2021年第4期420-427,共8页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China(NSFC Grant No.21571080);the Project 2019JLP-04 supported by Joint Foundation of Shaanxi;Xi’an Science and Technology Project of China(201805037YD15CG21(20))。

摘　　要：The carbon materials as anode electrodes have been widely studied for potassium ion batteries(PIBs).However,the large size of potassium ions prevents their intercalation/deintercalation,resulting in poor storage behaviors.Herein,a novel design of N/S codoped hierarchical carbonaceous fibers(NSHCF)formed from nanosheets self-assembled by catalyzing Aspergillus niger with Sn is reported.The asprepared NSHCF at 600℃(NSHCF-600)exhibits a high reversible capacity of 345.4 m Ah g^(-1) at 0.1 A g^(-1) after 100 cycles and an excellent rate performance of 124.5 m Ah g^(-1) at 2 A g^(-1).The excellent potassium storage performance can be ascribed to the N/S dual-doping,which enlarges interlayer spacing(0.404 nm)and introduces more defects.The larger interlayer spacing and higher pyridinic N active sites can promote K ions diffusion and storage.In addition,the ex situ transmission electron microscopy reveals the high reversibility of potassiation/depotassiation process and structural stability.

关 键 词：Carbonaceous fibers Large interlayer spacing Nitrogen/sulphur dual-doping Potassium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]