基于BiCl_(3)调控、ZIF-8转化的分级多孔硬碳结构设计及在钠离子电池中的应用  

BiCl_(3)-Regulated and ZIF8-Derived Hierarchical Porous Carbon as Anode for High-Performance Soudium-Ion Batteries

作　　者：万意 姚鹏飞 张华民[1] 郑琼[1] 李先锋[1] WAN Yi;YAO Pengfei;ZHANG Huamin;ZHENG Qiong;LI Xianfeng(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;University of Chinese Academy of Sciences,Beijing 100039,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100039

出　　处：《硅酸盐学报》2022年第1期26-36,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(22078319);中国科学院战略性先导研究专项(XDA21070500);中国科学院DNL合作基金(dnl2011914)。

摘　　要：从微观多孔结构设计的角度出发,以ZIF-8为碳化前驱体,采用Bi Cl_(3)对硬碳微孔、介孔结构进行调控,实现了分级多孔硬碳结构的可控设计与调控优化,有效提高了Na^(+)的扩散能力,提高了钠离子动力学。结果表明:该分级多孔碳表现出优异的倍率性能,在2 A/g和5A/g时,可逆比容量分别为225 m A·h/g和177 m A·h/g。通过分级多孔硬碳微孔和介孔结构对储钠过程影响机制的研究发现,微孔结构有利于平台区Na^(+)的扩散;介孔结构主要通过增大比表面提供更多的缺陷位点,促进Na^(+)的吸附,提升斜线区储钠容量。To improve the rate capability of hard carbon(HC),the corresponding hierarchical porous morphology was designed and the metal organic framework(ZIF-8)was selected as a precursor,and the hierarchical pore structure was adjusted via the addition of Bi Cl_(3).The results show that the synthesized hierarchical structure of HC electrodes can effectively improve the diffusion of Na ions.The synthesized hierarchical porous hard carbon can achieve a high reversible capacity of 225 m A·h/g and 177 m A·h/g at different currents of 2 A/g and 5 A/g,respectively,based on the optimized micro-and macro-pores.Furthermore,a relationship between the hierarchical porous structure(with micro-and macro-pores)and the sodium storage process was discussed.It is indicated that the micro-pores prefer to facilitate the sodium-ion diffusion in a plateau region,while the meso-pores prefer to provide more defect sites to enhance the adsorption of sodium ions,consequently improving the sodium storage capacity.

关 键 词：硬碳 分级多孔结构 储钠机制 钠离子电池 

分 类 号：TM53[电气工程—电器]