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Title: Electronic structural studies on the improved thermal stability of Li(Ni0.8Co0.15Al0.05)O2 by ZrO2 coating for lithium ion batteries

The electronic structures of bare and ZrO 2-coated Li(Ni 0.8Co 0.15Al 0.05)O 2 electrode systems were investigated using a combination of time-resolved X-ray diffraction and soft X-ray absorption spectroscopy (XAS) techniques. The ZrO 2 coating on the surface of Li(Ni 0.8Co 0.15Al 0.05)O 2 was effective in elevating the onset temperature of the dissociation of charged Li 0.33(Ni 0.8Co 0.15Al 0.05)O 2, which will enhance the safety of Li-ion cells. Lastly, soft XAS spectra of the Ni LII,III-edge in the partial electron yield mode were obtained, which showed that the enhanced electrochemical properties and thermal stability of the cathode materials by ZrO 2 coating can be attributed to the suppression of unwanted Ni oxidation state changes at the surface.
Authors:
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Publication Date:
Report Number(s):
BNL-113647-2017-JA
Journal ID: ISSN 0021-891X; VT1201000
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Electrochemistry
Additional Journal Information:
Journal Volume: 47; Journal Issue: 5; Journal ID: ISSN 0021-891X
Publisher:
Springer
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; National Synchrotron Light Source; Li(Ni0.8Co0.15Al0.05)O2; ZrO2 coating; thermal stability; soft X-ray absorption spectroscopy (XAS); Batteries
OSTI Identifier:
1348290