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Title: Improved electrochemical performance of spinel LiMn1.5Ni0.5O4 through MgF2 nano-coating

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C5NR03564C· OSTI ID:1324145
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [3]
  1. Henan Univ., Kaifeng (China). Key Lab. of Photovoltaic Materials of Henan Province. School of Physics and Electronics
  2. Henan Univ., Kaifeng (China). Key Lab. of Photovoltaic Materials of Henan Province. School of Physics and Electronics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
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In this paper, a spinel LiMn1.5Ni0.5O4 (LMNO) cathode material synthesized by a sol–gel method is modified by MgF2 nano-coating via a wet coating strategy. The results of X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM) showed that the MgF2 nano-coating layers do not physically change the bulk structure of the pristine material. Compared with the pristine compound, the MgF2-coated LMNO electrodes display enhanced cycling stabilities. Particularly, the 5 wt% MgF2-coated LMNO demonstrates the best reversibility, with a capacity retention of 89.9% after 100 cycles, much higher than that of the pristine material, 69.3%. The dQ/dV analysis and apparent Li+ diffusion coefficient calculation prove that the kinetic properties are enhanced after MgF2 surface modification, which partly explains the improved electrochemical performances. Electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectroscopy (FTIR) data confirm that the MgF2 coating layer helps in suppressing the fast growth of the solid electrolyte interface (SEI) film in repeated cycling, which effectively stabilizes the spinel structure. Finally and additionally, differential scanning calorimetry (DSC) tests show that the MgF2 nano-coating layer also helps in enhancing the thermal stability of the LMNO cathode.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Henan Univ., Kaifeng (China)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); 863 Program of China; China Scholarship Council
Contributing Organization:
Chinese Academy of Sciences (CAS), Beijing (China)
Grant/Contract Number:
AC05-00OR22725; 50902044; 2015AA034201; 201308410027
OSTI ID:
1324145
Journal Information:
Nanoscale, Vol. 7, Issue 38; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Cited By (6)

Research Progress in Improving the Cycling Stability of High-Voltage LiNi0.5Mn1.5O4 Cathode in Lithium-Ion Battery journal January 2017
A core–shell structured LiNi 0.5 Mn 1.5 O 4 @LiCoO 2 cathode material with superior rate capability and cycling performance journal January 2018
Chromium nitride as a stable cathode current collector for all-solid-state thin film Li-ion batteries journal January 2017
Effectively enhanced structural stability and electrochemical properties of LiNi 0.5 Mn 1.5 O 4 cathode materials via poly-(3,4-ethylenedioxythiophene)- in situ coated for high voltage Li-ion batteries journal January 2019
Functionalization of the carbon additive of a high-voltage Li-ion cathode journal January 2019
Chromium nitride as a stable cathode current collector for all-solid-state thin film Li-ion batteries text January 2017

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