Modification of In-situ N-doped graphene coated ZnO composites as anode for high performance lithium-ion batteries

The application of ZnO with high theoretical specific capacity as anode material for lithium-ion batteries is severely limited due to volume expansion during continuous cycling, slow lithium-ion diffusion, and poor conductivity. Here, ZnO nanoparticles were wrapped in N-doped multilayer graphene (Zn...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2023-12, Vol.967, p.171731, Article 171731
Main Authors: Li, Mingyuan, Du, Huiwei, Hong, Lun, Zhang, Jingji, Wang, Jiangying, Zong, Quan, Zhu, Zejie, Meng, Xianhe, Hong, Tao
Format: Article
Language:English
Subjects:
Core-shell
Graphene
Ion Diffusion
Lithium-ion batteries
Yolk-shell
ZnO
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The application of ZnO with high theoretical specific capacity as anode material for lithium-ion batteries is severely limited due to volume expansion during continuous cycling, slow lithium-ion diffusion, and poor conductivity. Here, ZnO nanoparticles were wrapped in N-doped multilayer graphene (ZnO@C) by chemical vapor deposition to improve specific capacity, rate performance, cycle stability, and conductivity. The thickness of the graphene layer and filling rate of ZnO in yolk-shell structure were investigated for the best electrochemical performance. The ZnO@C of yolk-shell structure with filling rate of 28% has a reversible specific capacity of 390 mAh/g after 200 cycles at 0.25 A/g, and achieves a capacity of 204.6 mAh/g at a high current of 1 A/g. The results show that N-doped porous graphene coated ZnO yolk-shell structure composites with etching treatment have good rate performance and cycle stability. The performance of electronic conductivity and lithium-ion diffusion is greatly improved, and the pseudocapacitive effect in the lithium storage mechanism is enhanced. •The impacts of N-doped graphene thickness in core-shell structure are investigated on the electrochemical performance of ZnO.•The doped N introduce C-vacancies on graphene, which provide nano-sized channels for ions to pass through.•The interspace in yolk-shell structure provide a buffer space for the volume effect of ZnO in charging-discharging processes.•The ion diffusion mechanisms of anode materials are discussed in electrochemical process.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2023.171731