摘要
水系锌离子电池(AZIBs)因锌的氧化还原电位低、能量密度高而有巨大的应用前景,其中储存Zn^(2+)的宿主正极决定了电池的放电性能和循环稳定性。以含有3个羧基的次氮基三乙酸(Nitrilotriacetic acid,NTA)为配体,通过简单的调整Mn^(2+):NTA的比例,制备了3种一维纳米线结构聚合物,并经煅烧处理中得到了3种氮掺杂碳纳米线负载不同粒径MnO材料MnO/NC-x。其中Mn^(2+)∶NTA比例为0.5时制备的MnO/NC-0.5中MnO粒径最小,且均匀的分散于纳米线表面。该材料作为AZIBs正极展现了卓越的离子扩散性和导电性等动力学特征。在2 A/g的高电流密度下该材料显示出158 mAh/g的倍率性能,并在1 A/g的条件下经历1000个循环后仍有96%的容量保持率,表现出卓越的循环稳定性。
Aqueous zinc-ion batteries(AZIBs)hold great promise for various applications due to the low redox potential of zinc and high energy density.The host cathode for storing Zn^(2+)determines the discharge performance and cycling stability of the battery.Herein,three one-dimensional nanowire structured polymers were prepared using nitrilotriacetic acid(NTA)as a ligand with three carboxyl groups,and three nitrogen-doped carbon nanowires loaded with different particle size MnO materials(MnO/NC-x)were obtained after calcination treatment.Among them,the MnO particles in MnO/NC-0.5 prepared with a Mn^(2+)∶NTA ratio of 0.5 had the smallest size and were uniformly dispersed on the nanowire surface.This material exhibited excellent kinetic properties such as ion diffusion and conductivity as the cathode for AZIBs.It delivered a rate capability of 158 mAh/g at a high current density of 2 A/g and still maintained a capacity retention of 96%after 1000 cycles at 1 A/g,demonstrating excellent cycling stability.
作者
何盈盈
卢维鹏
陈利君
丁皓东
余添
HE Yingying;LU Weipeng;CHEN Lijun;DING Haodong;YU Tian(School of Chemistry and Chemical Engineering,Xi an University of Architecture and Technology,Xi an 710055,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第9期9139-9148,共10页
Journal of Functional Materials
基金
国家自然科学基金项目(52270167)
大学生创新创业培训计划项目(202310703055)。
