Journal
JOURNAL OF POWER SOURCES
Volume 322, Issue -, Pages 40-48Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.04.118
Keywords
CNTs; Re-oxidation process; LiNi0.5Mn1.5O4; Mechano-fusion; Oxidation resistive carbon; Surface modification
Funding
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2010-C1AAA001-2010-0028958]
- Korea Institute of Science and Technology (KIST) Institutional Program [2E26330]
- Ministry of Science, ICT & Future Planning, Republic of Korea [2E26330] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
Surface-modified carbon nanotubes were utilized as a coating for LiNi0.5Mn1.5O4 (LNMO) via a mechanofusion method as a strategy to prevent unfavorable carbothermal reduction. Two types of carbon nanotubes were investigated as coating materials: carbon nanotubes (CNTs) and oxidized carbon nanotubes (OCNTs), which were prepared by a simple re-oxidation process. The samples coated with CNTs or OCNTs were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning and transmission electron microscopy, Raman spectroscopy, and elemental analyses. The OCNT-coated LNMO presented a highly enhanced discharge capacity retention (95.5%) and a coulombic efficiency of 99.9% after 80 cycles between 3.5 and 4.9 V (versus Li/Li+), whereas the CNT-coated LNMO exhibited poor retention of 47.2% and a coulombic efficiency of 95.3%. In addition, post-mortem XPS and electrochemical impedance spectroscopy (EIS) analysis proved that the OCNT coating improved the surface electrochemical stability and rate capability, whereas the CNT coating formed a thick resistive solid electrolyte interphase (SEI) film by accelerating the surface side reactions. (C) 2016 Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available