纳米TiO2构筑于多通道炭纤维实现室温钠-硫电池中多硫化物的高效吸附
Incorporating TiO2 nanoparticles into the multichannels of electro-spun carbon fibers to increase the adsorption of polysulfides in room temperature sodium-sulfur batteries
摘要
Abstract
With the rapid development of electric vehicles and large-scale power grids,lithium-ion batteries inevitably face the problem that their limited energy density and high cost cannot meet the growing demand.Room temperature sodium-sulfur(RT Na-S)batteries,which have the potential to replace lithium-ion batteries,have become a focus of attention.However,the challenging problem of their poor cycling performance cause by the"shuttle effect"of the reaction intermediates(sodium polysulfides)needs to be addressed.We report a method to incorporate TiO2 nano particles into the multichannels of electrospun carbon fibers(TiO2@MC-CFs)to stabilize the sulfur compounds and produce high-performance RT Na-S batteries.The TiO2@MCCFs were prepared by elec-trospinning followed by heat treatment,and were infiltrated by molten sulfur to fabricate S/TiO2@MCCF cathode materials.The ad-dition of the TiO2 nanoparticles increases the affinity of cathode materials for poly sulfides and promotes the conversion of poly sulf-ides to lower order products.This was verified by DFT calculations.A S/TiO2@MCCF cathode with a S content of 54％has im-proved electrochemical rate and cycling performance,with a specific capacity of 445.1 mAh g-1 after 100 cycles at 0.1 A g-1 and a nearly 100％Coulombic efficiency.Even at 2 A g-1,the cathode still has a capacity of 300.5 mAh g-1 after 500 cycles.This work provides a new way to construct high performance RT Na-S battery cathodes.关键词
钠-硫电池/正极/二氧化钛/静电纺丝Key words
Sodium-sulfur battery/Cathode/TiO2/Electrospinning分类
通用工业技术引用本文复制引用
叶鑫,李质奇,孙皓,吴明霞,安仲勋,庞越鹏,杨俊和,郑时有..纳米TiO2构筑于多通道炭纤维实现室温钠-硫电池中多硫化物的高效吸附[J].新型炭材料,2022,37(6):1116-1124,9.基金项目
The authors gratefully acknowledge the support of the National Natural Science Foundation of China(51971146,51971147,52171218),the Major Pro-gram for the Scientific Research Innovation Plan of Shanghai Education Commission(2019-01-07-00-07-E00015),the Shanghai Municipal Science and Tech-nology Commission(21010503100),the Shanghai Outstanding Academic Leaders Plan,the Guangxi Key Laboratory of Information Materials(Guilin Uni-versity of Electronic Technology,201017-K),the Shanghai Rising-Star Program(20QA1407100)and the General Program of Natural Science Foundation of Shanghai(20ZR1438400). 基金项目:国家自然科学基金(51971146,51971147,52171218),上海市教委创新计划重大项目(2019-01-07-00-07-E00015),上海市科委项目(21010503100,20ZR1438400)和启明星计划(20QA1407100),以及广西电子信息材料构效关系重点实验室(桂林电子科技大学)(201017-K)资助. （51971146,51971147,52171218）
