Core-Etched CC/SnO2 Nanotube Arrays as High-Performance Anodes for Lithium-Ion Batteries With Ionic Liquid Electrolyte

Ao Shen,Yangyang Zhou,Pingping Xu,Ying Weng,Ziying Zhang,Huizhen Zhang,Yangqiang Zhao

doi:10.3389/fmats.2020.00063

Abstract

Despite the design of nano-structured SnO2 anodes has attracted much attention because of its high theoretical capacity, good electron mobility and low potential of lithium-ion intercalation, challenges remain due to their weak mechanical stability, complex processing and rapid capacity decay. The flexible one-dimensional binder-free porous CC/SnO2 nanotube arrays are synthesized with a well-suited core etching method to meet the needs of steady operation of flexible devices under mechanical deformation. This porous, binder-free nanostructure has large contact area with the electrolyte and excellent electron transport performance. The electrochemical measurements demonstrate that these nanotube arrays have high energy density and high-rate capability. After 500 cycles at a current density of 200 mA g−1, their stable capacity remains at 595.7 mA h g−1.

Highlights

As a green power source, lithium-ion batteries have attracted much attention because of their high energy and power density (Lee et al, 2009; Wang J. et al, 2016; Fan et al, 2019)
The obtained Carbon cloth (CC)/ZnO and CC/SnO2 products were identified by X-ray powder diffraction (XRD) measurements
The 1D binder-free porous CC/SnO2 nanotube arrays were successfully synthesized by using a suitable core etching method

Summary

Introduction

As a green power source, lithium-ion batteries have attracted much attention because of their high energy and power density (Lee et al, 2009; Wang J. et al, 2016; Fan et al, 2019). The low theoretical capacity and poor cycling performance of commercial graphite anodes have hindered the further application of lithium-ion batteries (Song et al, 2017; Ding et al, 2019b). Stannic oxide (SnO2), the typical n-type wide-bandgap semiconductor, has been considered as a potential candidate for high-performance anodes due to its high theoretical capacity (781 mA h g−1), good electron mobility (240 cm V−1 S−1) and low potential of lithium ion intercalation (Tian et al, 2016; Wang M. et al, 2016). It is urgent to seek an effective, economic, and scalable approach to prepare SnO2 anode materials with satisfactory capacity and rate capability

Methods

Results

Conclusion