NDLI: Influence of vanadium compound coating on lithium-rich layered oxide cathode for lithium-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Yan, Wan-Hong Pei, Shan-Shan Liao, Shi-Xuan Zhong, Ben-He Zhong, Yan-Jun Wang, Xing-Long Shen, Chong-Heng Guo, Xiaodong Liu, Heng Shi, Xia-Xing
Copyright Year	2014
Abstract	A vanadium compound is applied as a coating material to improve the electrochemical performance of the lithium-rich layered oxide Li1.2Mn0.6Ni0.2O2. The physicochemical properties of the material before and after coating are characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (FT-IR). Results reveal that LiδV2O5 (δ is very small) is successfully coated on the as-prepared material, and the crystal properties of the powder have been modified after coating. The formation of the LiδV2O5 coating layer is a result of some Li-ions diffusing from the Li1.2Mn0.6Ni0.2O2 particle to the coating layer at the interface. The material before and after coating serve as the cathode for lithium-ion batteries and were investigated by galvanostatic measurements within a voltage range of 2.0–4.8 V (vs. Li/Li+). The initial coulombic efficiency (CE1) of Li1.2Mn0.6Ni0.2O2 is improved from 71.8% to 87.7% due to the LiδV2O5 coating layer, which can act as an insertion host to accept the lithium ions that could not be inserted back into the bulk lattice during the first discharge process. Additionally, the electrochemical performances (cycling performance and rate capability) of the modified Li1.2Mn0.6Ni0.2O2 are very superior to the pristine one. The significantly improved electrochemical performances are attributed primarily to: (i) the modified crystal properties after coating; (ii) the amelioration of the charge-transfer resistance after coating; (iii) the coating layer which can contribute to stabilizing the electrode surface by suppressing the side reactions between electrode and electrolyte.
Starting Page	56273
Ending Page	56278
Page Count	6
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c4ra10097b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Infrared spectroscopy Lithium-ion battery Electrode Cathode High-resolution transmission electron microscopy Vanadium Lithium Photoemission spectroscopy Fourier-transform infrared spectroscopy Scanning electron microscope X-ray crystallography Electrolyte Electrochemistry X-ray photoelectron spectroscopy Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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