Carbon-Coated SiO2 Composites as Promising Anode Material for Li-Ion Batteries.

Mihaela-Ramona Buga,Cosmin Giorgian Ungureanu,Eugeniu Vasile,Adnana Alina Spinu-Zaulet,Raul-Augustin Mitran,Florentina Neatu,Mihaela Florea

doi:10.3390/molecules26154531

Abstract

Porous silica-based materials are a promising alternative to graphite anodes for Li-ion batteries due to their high theoretical capacity, low discharge potential similar to pure silicon, superior cycling stability compared to silicon, abundance, and environmental friendliness. However, several challenges prevent the practical application of silica anodes, such as low coulombic efficiency and irreversible capacity losses during cycling. The main strategy to tackle the challenges of silica as an anode material has been developed to prepare carbon-coated SiO2 composites by carbonization in argon atmosphere. A facile and eco-friendly method of preparing carbon-coated SiO2 composites using sucrose is reported herein. The carbon-coated SiO2 composites were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetry, transmission and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, cyclic voltammetry, and charge–discharge cycling. A C/SiO2-0.085 M calendered electrode displays the best cycling stability, capacity of 714.3 mAh·g−1, and coulombic efficiency as well as the lowest charge transfer resistance over 200 cycles without electrode degradation. The electrochemical performance improvement could be attributed to the positive effect of the carbon thin layer that can effectively diminish interfacial impedance.

Highlights

Li-ion battery technology is at the core of the imminent massive vehicle electrification due to the forecast growth penetration rate of electrified vehicles [1]
InInbrief, were added addedtotoa asucrose sucrose solution is illustrated in Scheme brief,silica silicananoparticles nanoparticles were solution of of
Carbon-coated SiO2 composites were prepared through a facile and eco-friendly method, involving the carbonization of a sucrose–silica precursor at 900 ◦ C

Summary

Introduction

Li-ion battery technology is at the core of the imminent massive vehicle electrification due to the forecast growth penetration rate of electrified vehicles [1]. Shifting to silicon as an anode material has the potential to deliver higher energy density for the batteries. The anode of a Liion battery should operate at low potentials and offer high specific energy capacity and density. Research interest toward SiO2 -based materials as a promising new alternative to graphite has been significantly increased due to the high theoretical capacity and low discharge potential similar to pure silicon.

Methods

Results

Conclusion