Chemistry, Department of

 

Department of Chemistry: Faculty Publications

Accessibility Remediation

If you are unable to use this item in its current form due to accessibility barriers, you may request remediation through our remediation request form.

Document Type

Article

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.

Download

Share

COinS