Nitrogen doping and graphitization tuning coupled hard carbon for superior potassium-ion storage

作     者：Junxian Hu Yangyang Xie Meng Yin Zhian Zhang Junxian Hu;Yangyang Xie;Meng Yin;Zhian Zhang

作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第10期

页      面：327-334页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：support of the Innovation Program of Central South University(No.2018zzts139) 

主　　题：Hard carbon Nitrogen doping Graphitic domains Potassium ion batteries Adsorption-intercalation mechanism 

摘      要：Hard carbon material is one of the most promising anode materials for potassium ion batteries(PIBs)due to its distinct disordered and non-expandable ***,the intrinsically disordered microarchitecture of hard carbon results in low electric conductivity and poor rate ***,nitrogendoped and partially graphitized hard carbons(NGHCs)derived from commercial coordination compound precursor-ethylenediaminetetraacetic acid(EDTA)disodium cobalt salt hydrate are designed and prepared as high-performance PIBs anode *** means of a facile annealing method,nitrogen elements and graphitic domains can be controllably introduced to *** resulting NGHCs show structural merits of mesoporous construction,nitrogen doping and homogeneous graphitic domains,which ensures fast kinetics and electron *** in anode for PIBs,NGHCs exhibit robust rate capability with high reversible capacity of 298.8 m Ah g^-1 at 50 m A g^-1,and stable cycle stability of 137.6 mAh g^-1 at 500 m A g^-1 after 1000 ***,the ex situ Raman spectra reveal a mixtureadsorption-intercalation mechanismfor potassium storage of *** importantly,full PIBs by pairing with perylenetetracarboxylic dianhydride(PTCDA)cathode demonstrate the promising potential of practical *** terms of commercial precursor,facile synthesis and long cycle lifespan,NGHCs represent a brilliant prospect for practical large-scale applications.