Multi boron-doping effects in hard carbon toward enhanced sodium ion storage  

作　　者：Peng Zheng Wang Zhou Ying Mo Biao Zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei Liu 

机构地区：[1]College of Materials Science and Engineering,Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology,Hunan University,Changsha 410082,Hunan,China [2]Greater Bay Area Institute for Innovation,Hunan University,Guangzhou 511300,Guangdong,China [3]Changsha Research Institute of Mining&Metallurgy Co.,LTD.,Changsha 410017,Hunan,China

出　　处：《Journal of Energy Chemistry》2025年第1期730-738,共9页能源化学(英文版)

基　　金：National Key Research and Development Program of China (2022YFE0206300);National Natural Science Foundation of China (U21A2081,22075074, 22209047);Guangdong Basic and Applied Basic Research Foundation (2024A1515011620);Hunan Provincial Natural Science Foundation of China (2024JJ5068);Foundation of Yuelushan Center for Industrial Innovation (2023YCII0119);Student Innovation Training Program (S202410532594,S202410532357)。

摘　　要：Hard carbon (HC) has been considered as promising anode material for sodium-ion batteries (SIBs).The optimization of hard carbon’s microstructure and solid electrolyte interface (SEI) property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly desirable.Herein,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage sites.In-situ Fourier transform infrared spectroscopy/electrochemical impedance spectroscopy (FTIR/EIS) and X-ray photoelectron spectroscopy (XPS) analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate performance.As a result,the hard carbon anode with optimized boron doping content exhibits enhanced rate and cycling performance.In general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关 键 词：Hard carbon Sodium-ion batteries Boron doping Pore structure Electrode/electrolyte interphases 

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