23October2019

Nano-Micro Letters

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

Pan Deng1, Jing Yang1, Shengyang Li1, Tian-E Fan2, *, Hong-Hui Wu3, Yun Mou4, Hui Huang1, Qiaobao Zhang1, *, Dong-Liang Peng1, Baihua Qu1, *

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Nano-Micro Lett. (2019) 11: 18

First Online: 01 March 2019 (Article)

DOI:10.1007/s40820-019-0246-4

*Corresponding author. E-mail: bhqu@xmu.edu.cn (Baihua Qu); fante@cqupt.edu.cn (Tian-E Fan); zhangqiaobao@xmu.edu.cn (Qiaobao Zhang)

 

Abstract

 


Toc

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/de-lithiation 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, herein, 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 in-situ 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). The findings of this study will be helpful in developing and fabricating 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. 


 

Keywords

Ultrafine SnO2 nanostructures; ZIF-67 frameworks; Enhanced initial Coulombic efficiency; Reversible conversion reaction

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