摘要
MXene材料由于其独特的二维结构在储能领域受到了广泛的关注.通过对V 2AlC陶瓷粉体中Al层原子的选择性刻蚀可以制备出V2CTx二维纳米材料,其作为锂离子电池负极材料具有高的理论比容量,然而其刻蚀过程较为困难,且刻蚀产物表面的官能团显著影响其电化学性能.本论文采用HF以及HCl/NaF这两种刻蚀剂制备出了V2CTx二维材料,利用XRD、SEM、EDS和电化学工作站研究了其晶相、形貌结构和电化学性能.结果表明,采用HF做刻蚀剂得到的V2CTx在大电流密度下具有较好的循环性能,在0.1 A g-1的电流密度下循环100次,放电比容量分别为248 mAh g-1;在1A g-1的电流密度下循环1000次,可逆比容量分别为94 mAh g-1.
MXene materials have attracted extensive attention in the field of energy storage because of their unique two-dimensional structure.The V2CTx two-dimensional nanomaterials can be prepared by selective etching of the Al layer atoms in the V 2AlC ceramic powders.They have a high theoretical specific capacity as anode materials for lithium-ion batteries.However,their etching process is difficult and the functional groups on the surface of the etching products significantly affect their electrochemical performance.Here V2CTx two-dimensional materials were prepared by using HF and HCl/NaF etchants.The crystal phase,morphology and electrochemical properties of V2CTx were used by means of XRD,SEM,EDS and electrochemical workstation.The results show that the V2CTx obtained by using HF as etcher has better cycling performance under large current density.It circulates 100 times at the current density of 0.1 A g-1,and the specific discharge capacity is 248 mAh g-1 respectively.The reversible specific capacity is 94 mAh g-1 respectively under the current density of 1 A g-1 for 1000 cycles.
作者
刘毅
李涛
罗威
王闯业
郭守武
LIU Yi;LI Tao;LUO Wei;WANG Chuang-ye;GUO Shou-wu(School of Materials Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
CAS
2020年第6期99-104,共6页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(299111720)
陕西科技大学储能材料与器件平台建设项目(0126-126021802)。
