期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 816, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152633
关键词
Li ion battery; Anode material; ZnS; Defective CNTs
资金
- National Natural Science Foundation of China [51974114, 51672075, 21271069, 51772092]
- Fundamental Research Funds for the Central Universities
Zinc sulfide (ZnS) is expected to be a potential replacement of commercial graphite as the anode material for lithium-ion batteries (LIBs) due to its non-toxicity, high theoretical capacity and low cost. Nevertheless, there are still several problems for the application of ZnS during lithium-ion storage process, such as undergoing intercalation/extraction reaction, conversion reaction (ZnS to Zn and LiS2) and alloying reaction (LixZn), which make ZnS exhibit more pronounced polarization and lower reversible capacity at high current density. In order to overcome these problems, in this work we designed a composite (ZnS-CNTs) of etched multi-walled carbon nanotubes (CNTs) and ZnS nanoparticles used as the anode material of LIBs. CNTs were etched in air to obtain rough surfaces with many defects, which could provide many active sites for the growth of ZnS nanoparticles. The ZnS-CNTs composite exhibits high reversible capacity of 451.3 mAh/g after 1200 cycles at a high current density of 5 A/g, and superior rate capability (377.8 mAh/g at 8 A/g). Interestingly, the ZnS-CNTs electrode exhibits the typical specific capacity recovery phenomenon, resulting in an excellent stability during the long-term cycling. SEM images of the ZnS-CNTs electrode materials after different cycles show that the ZnS nanoparticles and CNTs gradually merged together with the increase of cycles, which not only effectively alleviates the structural damage caused by volume change of ZnS in the charge and discharge cycling, but also greatly increases the specific capacity due to the increase of its electrochemical reaction area. (C) 2019 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据