NiS2 nanospheres coated by nitrogen-doped carbon for enhanced sodium storage performance

被引:22
作者
Zhang, W. X. [1 ]
Zhang, J. H. [1 ]
Guo, J. Q. [1 ]
He, C. [2 ]
Wen, J. R. [1 ]
机构
[1] Changan Univ, Sch Mat Sci & Engn, Xian 710064, Peoples R China
[2] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
基金
中国国家自然科学基金;
关键词
NiS2@NC; PVP-assisted hydrothermal; Charge storage mechanism; Sodium-ion battery; METAL-ORGANIC FRAMEWORKS; LITHIUM-ION BATTERIES; HIGH-RATE CAPABILITY; POROUS CARBON; ANODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; COMPOSITES;
D O I
10.1016/j.jallcom.2022.168379
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nickel disulfide is used as anode material for sodium-ion batteries, with low cost, abundant reserves, and a wide variety of theoretical specific capacities as high as 870 mAh g-1. However, large volume expansion and low ionic conductivity during Na+ intercalation and deintercalation lead to poor electrochemical perfor-mance. This work has synthesized carbon layer-coated and N-doped NiS2 nanospheres through PVP-assisted hydrothermal and subsequent annealing processes, reducing volume expansion and improving electrical conductivity and Na+ storage activity, increasing ion diffusion kinetics during electrochemical charge -dis-charge in excellent specific capacity and cycle stability. When evaluated as a negative electrode for Sodium -ion batteries (SIBs), it exhibits excellent specific capacity (554.3 mAh g-1 at 0.2 A g-1, first-cycle coulombic efficiency of 92.3 %), and excellent long-cycle stability (436.3 mAh g-1 at 1 A g-1 for 800 cycles), demon-strating the potential of NiS2@NC as an ideal anode material for SIBs.(c) 2022 Elsevier B.V. All rights reserved.
引用
收藏
页数:7
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