Structural regulation of coal-derived hard carbon anode for sodium-ion batteries via pre-oxidation  

作　　者：Meng-Yuan Su Kai-Yang Zhang Edison Huixiang Ang Xue-Li Zhang Yan-Ning Liu Jia-Lin Yang Zhen-Yi Gu Faaz A.Butt Xing-Long Wu 

机构地区：[1]Faculty of Chemistry,Northeast Normal University,Changchun 130024,China [2]MOE Key Laboratory for UV Light-Emiting Materials and Technology.Northeast Normal University.Ministry of Education,Changchun 130024,China [3]Natural Sciences and Science Education,National Institute of Education,Nanyang Technological University,Singapore 637616,Singapore [4]Materials Engineering Department,NED University of Engineering and Technology,Karachi 75300,Pakistan

出　　处：《Rare Metals》2024年第6期2585-2596,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52173246);111 project(No.B13013);Shccig-Qinling Program(No.SMYJY20220574)。

摘　　要：Hard carbon(HC)is broadly recognized as an exceptionally prospective candidate for the anodes of sodium-ion batteries(SIBs),but their practical implementation faces substantial limitations linked to precursor factors,such as reduced carbon yield and increased cost.Herein,a cost-effective approach is proposed to prepare a coal-derived HC anode with simple pre-oxidation followed by a post-carbonization process which effectively expands the d_(002)layer spacing,generates closed pores and increases defect sites.Through these modifications,the resulting HC anode attains a delicate equilibrium between plateau capacity and sloping capacity,showcasing a remarkable reversible capacity of 306.3 mAh·g^(-1)at 0.03 A·g^(-1).Furthermore,the produ ced HC exhibits fast reaction kinetics and exceptional rate performance,achieving a capacity of 289 mAh·g^(-1)at 0.1 A·g^(-1),equivalent to~94.5%of that at 0.03 A·g^(-1).When implemented in a full cell configuration,the impressive electrochemical performance is evident,with a notable energy density of 410.6 Wh·kg^(-1)(based on cathode mass).In short,we provide a straightforward yet efficient method for regulating coal-derived HC,which is crucial for the widespread use of SIBs anodes.

关 键 词：Sodium-ion batteries Hard carbon ANODE COAL PRE-OXIDATION 

分 类 号：TM912[电气工程—电力电子与电力传动]