Carbon Loaded Nano-Designed Spherically High Symmetric Lithium Iron Orthosilicate Cathode Materials for Lithium Secondary Batteries.

Diwakar Karuppiah,Subadevi Rengapillai,Wei-Ren Liu,Rajkumar Palanisamy,Chia-Hung Huang,Sivakumar Marimuthu

doi:10.3390/polym11101703

Abstract

In the present study, Li2FeSiO4 (LFS) cathode material has been prepared via a modified polyol method. The stabilizing nature of polyol solvent was greatly influenced to reduce the particle size (~50 nm) and for coating the carbon on the surface of the as-mentioned materials (~10 nm). As-prepared nano-sized Li2FeSiO4 material deliver initial discharge capacity of 186 mAh·g−1 at 1C with the coulombic efficiency of 99% and sustain up to 100 cycles with only 7 mAh·g−1 is the difference of discharge capacity from its 1st cycle to 100th cycle. The rate performance illustrates the discharge capacity 280 mAh·g−1 for lower C-rate (C/20) and 95 mAh·g−1 for higher C-rate (2C).

Highlights

An economic status of any nation has been scaled by consumption of electric energy
Li2 FeSiO4 (LFS)/C was prepared by the polyol method using diethylene glycol (DEG) (99%, Alfa Aesar) as a solvent [44]
The Li2 FeSiO4 cathode material with an orthorhombic structure was successfully synthesized via the polyol method

Summary

Introduction

An economic status of any nation has been scaled by consumption of electric energy. All the countries are probing viable technology for electric energy storage devices from the intermittent renewable sources. The cathode materials Li2 FeSiO4 (LFS) capture a wide attention due to its high theoretical capacity (of 332 for 2 Li+ and 166 mAh·g−1 for 1 Li+ diffusion), safety and environmental benignity [40]. It has been suffered from poor practical capacity attributed to the poor electronic conductivity and presence impurities, which were generated during the synthesis process [32,41]. This work discloses the preparation and the half-cell performance of spherically symmetric Li2 FeSiO4 /C particle using the polyol method, since it is an energy efficient route This method offers worthy homogeneity and reduced particle size. The structural, elemental, morphological and electrochemical performances of the Li2 FeSiO4 /C materials have been characterized by XRD, XPS, SEM and galvanostatic charge–discharge analyses

Materials and Methods

Results

Findings

Conclusions