Gelatin-assisted synthesis of LiNi0.5Mn1.5O4 cathode material for 5V lithium rechargeable batteries

•Spinel LiNi0.5Mn1.5O4 was synthesized by gelatin-assisted method.•Moderate amount of gelatin optimize the spinel structure and morphology.•LNMO-6 cathode exhibits enhanced cycling stability and rate performance.•LNMO-6 cathode displays smaller interface impedance including RSEI and Rct. In this wor...

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Bibliographic Details
Published in:Applied surface science 2013-07, Vol.276, p.635-640
Main Authors: Mo, Mingyue, Ye, Chengcong, Lai, Ke, Huang, Zhenze, Zhu, Licai, Ma, Guozheng, Chen, Hongyu, Hui, K.S.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Electrochemical impedance spectroscopy
Electrode materials
Exact sciences and technology
Gelatin
LiNi0.5Mn1.5O4
Physics
Scanning electron microscopy
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Summary:•Spinel LiNi0.5Mn1.5O4 was synthesized by gelatin-assisted method.•Moderate amount of gelatin optimize the spinel structure and morphology.•LNMO-6 cathode exhibits enhanced cycling stability and rate performance.•LNMO-6 cathode displays smaller interface impedance including RSEI and Rct. In this work, gelatin is for the first time utilized to conduct polymer-assisted synthesis of LiNi0.5Mn1.5O4 as the cathode material for 5V lithium rechargeable batteries. The effect of different amounts of gelatin on structural and morphological properties, electrochemical characterization of the obtained products are investigated by XRD, SEM, charge/discharge testing, cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS), respectively. It's found that with the addition of moderate amount of gelatin, the sample displays a higher degree of crystallinity and phase purity, more uniform shape and monodispersed nanometric size. As a result, electrochemical cycling stability and rate performance are significantly enhanced. CV and EIS measurements further demonstrate that using an optimal amount of gelatin can improve electrochemical performance due to the reversible reaction, faster insertion/extraction of Li ions in the spinel structure and decreased interface independence.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2013.03.145