Issue 29, 2015
From the journal:

RSC Advances

Synthesis and electrochemical performance of Na-modified Li2Fe0.5Mn0.5SiO4 cathode material for Li-ion batteries

Ming Li,ab   Lu-Lu Zhang,*ac   Xue-Lin Yang,*a   Hua-Bin Sun,ab   Yun-Hui Huang,d   Gan Liang,e   Shi-Bing Nia  and  Hua-Chao Taoa  

* Corresponding authors

a College of Materials and Chemical Engineering, Collaborative Innovation Center for Microgrid of New Energy, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
E-mail: xlyang@ctgu.edu.cn, zlljoy@126.com
Fax: +86-717-6397505
Tel: +86-717-6392449

b College of Mechanical & Power Engineering of China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China

c CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

d School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, China

e Department of Physics, Sam Houston State University, Huntsville, Texas 77341, USA

Abstract

A series of Li2−xNaxFe0.5Mn0.5SiO4/C (x = 0.00, 0.01, 0.03 and 0.05) composites have been synthesized via a refluxing-assisted solid-state reaction, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), galvanostatic charge–discharge measurements, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. XRD results show that Li2−xNaxFe0.5Mn0.5SiO4/C can be well indexed as the structure of two mixed polymorphs with space group P21 and Pmn21. XPS results confirms that Na not only exists on the surface of Li2Fe0.5Mn0.5SiO4 particles, but also has been successfully doped into the crystal lattice of Li2Fe0.5Mn0.5SiO4. Na-doping can significantly improve the discharge capacity and the rate capability of Li2Fe0.5Mn0.5SiO4/C. The enhanced electrochemical performance can be attributed to the increased electronic conductivity, the decreased charge transfer impedance, and the improved Li-ion diffusion coefficient.

Graphical abstract: Synthesis and electrochemical performance of Na-modified Li2Fe0.5Mn0.5SiO4 cathode material for Li-ion batteries

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Article information

DOI
https://doi.org/10.1039/C5RA02129D
Article type
Paper
Submitted
03 Feb 2015
Accepted
23 Feb 2015
First published
23 Feb 2015

RSC Adv., 2015,5, 22818-22824

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Synthesis and electrochemical performance of Na-modified Li2Fe0.5Mn0.5SiO4 cathode material for Li-ion batteries

M. Li, L. Zhang, X. Yang, H. Sun, Y. Huang, G. Liang, S. Ni and H. Tao, RSC Adv., 2015, 5, 22818 DOI: 10.1039/C5RA02129D

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