Cited 4 time in webofscience Cited 4 time in scopus

High-rate cycling performance and surface analysis of LiNi1-xCox/2Mnx/2O2 (x=2/3, 0.4, 0.2) cathode materials

Title
High-rate cycling performance and surface analysis of LiNi1-xCox/2Mnx/2O2 (x=2/3, 0.4, 0.2) cathode materials
Authors
Oh, JiminKim, JumiLee, Yong MinShin, Dong OkKim, Ju YoungLee, Young-GiKim, Kwang Man
DGIST Authors
Lee, Yong Min
Issue Date
2019-01
Citation
Materials Chemistry and Physics, 222, 1-10
Type
Article
Article Type
Article
Author Keywords
Nickel-based layered materialsElectrochemical performanceSolid electrolyte interfaceX-ray photoelectron spectroscopy
Keywords
LITHIUM-ION BATTERIESSOLID-ELECTROLYTE INTERPHASEELECTROCHEMICAL PERFORMANCEINTERFACE COMPOSITIONVINYLENE CARBONATEOXYGEN RELEASELINICHEMISTRYCELLS
ISSN
0254-0584
Abstract
The electrochemical performance of layered LiNi1-xCox/2Mnx/2O2 cathode materials (x = 2/3, 0.4, 0.2; so-called NCM333, NCM622, NCM811) in 1.0 M LiPF6-dissolved conventional carbonate-based electrolyte during formation at a 0.1 C-rate and consequent cycling at a 1.0 C-rate is measured and considered together with the results of morphology observation, impedance spectroscopy, and surface analysis. X-ray photoelectron spectroscopy (XPS) is carried out on the surface of the cathode materials before and after formation and cycling to investigate the effects of solid electrolyte interphase (SEI) formation on the electrochemical performance. As the Ni content increases, the initial specific capacity increases but the capacity retention ratio decreases. High-rate cycling overrides the SEI formation on the NCM surfaces, but NCM622 suffers great changes in the SEI components with a thick layer resulting in large interfacial resistance. It is also proved that NCM811 shows significant dissolution and accumulation of Ni species on the surface, contributing structural degradation and leading to fast capacity fading. © 2018 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/9447
DOI
10.1016/j.matchemphys.2018.09.076
Publisher
Elsevier Ltd
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE