High Initial Reversible Capacity and Long Life of Ternary SnO2‑Co‑carbon Nanocomposite Anodes for Lithium‑Ion Batteries

Authors

Pan Deng, Xiamen University
Jing Yang, Xiamen University
Shengyang Li, Xiamen University
Tian-E Fan, Library of Chongqing University of Posts and TelecommunicationsFollow
Hong-Hui Wu, University of Nebraska - LincolnFollow
Yun Mou, Huazhong University of Science and Technology
Hui Huang, Xiamen University
Qiaobao Zhang, Xiamen UniversityFollow
Dong-Liang Peng, Xiamen University
Baihua Qu, Xiamen UniversityFollow

Date of this Version

2019

Citation

Nano-Micro Lett. (2019) 11:18

Comments

© The Author(s) 2019

Open access

https://doi.org/10.1007/s40820-019-0246-4

Abstract

The two major limitations in the application of SnO₂ for lithium-ion battery (LIB) anodes are the large volume variations of SnO₂ during repeated lithiation/delithiation processes and a large irreversible capacity loss during the first cycle, which can lead to a rapid capacity fade and unsatisfactory initial Coulombic efficiency (ICE). To overcome these limitations, we developed composites of ultrafine SnO₂ nanoparticles and in situ formed Co(CoSn) nanocrystals embedded in an N-doped carbon matrix using a Co-based metal–organic framework (ZIF-67). The formed Co additives and structural advantages of the carbon-confined SnO₂/ Co nanocomposite effectively inhibited Sn coarsening in the lithiated SnO₂ and mitigated its structural degradation while facilitating fast electronic transport and facile ionic diffusion. As a result, the electrodes demonstrated high ICE (82.2%), outstanding rate capability (~ 800 mAh g⁻¹ at a high current density of 5 A g⁻¹), and long-term cycling stability (~ 760 mAh g⁻¹ after 400 cycles at a current density of 0.5 A g⁻¹). This study will be helpful in developing high-performance Si (Sn)-based oxide, Sn/Sb-based sulfide, or selenide electrodes for LIBs. In addition, some metal organic frameworks similar to ZIF-67 can also be used as composite templates.