Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 9, Pages 14391-14395Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.06.032
Keywords
Lithium ion batteries; Solution combustion synthesis method; LiNi0.5Mn1.5O4 spinel
Categories
Funding
- National Natural Science Foundation of China [51362012]
- Natural Science Foundation of Yunnan Province [2012FB173]
- Key Construction Disciplines of Chemistry for Master Degree Program in Yunnan
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Single phase LiNi0.5Mn1.5O4 spinet with excellent electrochemical performance has been synthesized by a novel solution combustion synthesis method at 700 degrees C for 30 min. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FEIR) and scanning electron microscope (SEM) have been used to investigate the phase structure and micro-morphology of the product. Charge discharge measurement, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) have been used to study the electrochemical performance. The results indicate that the as-prepared product is a single phase LiNi0.5Mn1.5O4 spinel with a disordered Fd-3m space group. The LiNi0.5Mn1.5O4 exhibits excellent electrochemical performance including cycling stability and rate capability due to its high cystallinity, large Li+ diffusion coefficient and low charge transfer resistance. It can deliver reversible capacities of 130, 113 and 104 mAh/g at 1 C, 10 C and 20 C current rates, respectively. The capacity retentions of the product at 1 C at room temperature, at 10 C at room temperature and at 1 C at 55 degrees C after 100 cycles are 97.5%, 99.7% and 94.2%, respectively. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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