Effectively stabilizing 5 V spinel LiNi0.5Mn1.5O4 cathode in organic electrolyte by polyvinylidene fluoride coating

[Display omitted] •PVDF coatings were homogeneously applied onto the LNMO cathode material.•The stable and oxidation resistant film effectively protects the cathode at extreme conditions.•The 5 V LNMO cathode exhibits much enhanced electrochemical properties.•Impedance rise of the electrode with pro...

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Bibliographic Details
Published in:Applied surface science 2018-10, Vol.455, p.349-356
Main Authors: Zheng, Xueying, Liu, Weijie, Qu, Qunting, Shi, Qiang, Zheng, Honghe, Huang, Yunhui
Format: Article
Language:English
Subjects:
Cycling stability
Lithium-ion batteries
PVDF coating
Rate capability
Spinel LiNi0.5Mn1.5O4 cathode
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Summary:[Display omitted] •PVDF coatings were homogeneously applied onto the LNMO cathode material.•The stable and oxidation resistant film effectively protects the cathode at extreme conditions.•The 5 V LNMO cathode exhibits much enhanced electrochemical properties.•Impedance rise of the electrode with prolonged electrochemical cycles is suppressed.•Mn disslotion into organic electrolyte is greatly reduced. To stabilize 5 V spinel LiNi0.5Mn1.5O4 (LNMO) cathode in organic electrolyte, electrochemically inactive and oxidation resistant polyvinylidene fluoride (PVDF) is applied onto the particle surface through a liquid coating process. The morphology, crystalline structure, and coating thickness of the as-prepared samples are analyzed with X-ray powder diffraction, Raman spectroscopy, and scanning and transmission electron microscopies. With the protection of PVDF wrapping layer, electrolyte decomposition at the electrode/electrolyte interface is greatly reduced and the growth of the solid electrolyte interface (SEI) on the cathode is effectively suppressed. Moreover, Mn dissolution into the electrolyte during long-term cycling is significantly decreased. As the result, the 5 V spinel LNMO cathode is effectively stabilized in organic electrolyte and its overall electrochemical performances are greatly enhanced. With 50 nm PVDF-wrapping, the LNMO composite cathode exhibits a capacity retention of 97.8% and 86.1% after 300 cycles at room and high temperature, respectively. The fatal impedance rise of the electrode during prolonged electrochemical cycles due to the surface evolution is also effectively suppressed.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2018.05.151