Journal
JOURNAL OF POWER SOURCES
Volume 245, Issue -, Pages 739-744Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.07.033
Keywords
Li-ion battery; Positive electrode; Carbon black; Degradation
Funding
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231]
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Electrochemical behavior of carbon black (CB) additives in 1 M LiPF6 EC/DEC (3:7 vol.) electrolyte in the operation potential range of positive electrodes in Li-ion cells was investigated. Various carbon blacks display noticeable electrochemical activity towards PF6- intercalation and electrolyte oxidation at potentials >4.0 V vs. Li/Li+. In situ X-ray diffraction, Raman spectroscopy, and ex situ scanning electron microscopy and Fourier Transform Infrared (FTIR) spectroscopy showed that repetitive intercalation/deintercalation of PF6- anions leads to structural alteration and degradation of carbon black nanoparticles. The mechanism of these interfacial processes on CB electrodes and their implications for electrochemical performance of high-voltage Li-ion electrodes during long-term cycling is evaluated. (C) 2013 Elsevier B.V. All rights reserved.
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