Electrolyte Volume Effects on Electrochemical Performance and Solid Electrolyte Interphase in Si-Graphite/NMC Lithium-Ion Pouch Cells.

Autor: An SJ; Energy & Transportation Science Division, Oak Ridge National Laboratory , One Bethel Valley Road, P. O. Box 2008, Oak Ridge, Tennessee 37831, United States.; Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee , 418 Greve Hall, 821 Volunteer Boulevard, Knoxville, Tennessee 37996, United States., Li J; Energy & Transportation Science Division, Oak Ridge National Laboratory , One Bethel Valley Road, P. O. Box 2008, Oak Ridge, Tennessee 37831, United States.; Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee , 418 Greve Hall, 821 Volunteer Boulevard, Knoxville, Tennessee 37996, United States., Daniel C; Energy & Transportation Science Division, Oak Ridge National Laboratory , One Bethel Valley Road, P. O. Box 2008, Oak Ridge, Tennessee 37831, United States.; Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee , 418 Greve Hall, 821 Volunteer Boulevard, Knoxville, Tennessee 37996, United States., Meyer HM 3rd; Materials Science and Technology Division, Oak Ridge National Laboratory , One Bethel Valley Road, P. O. Box 2008, Oak Ridge, Tennessee 37831, United States., Trask SE; Chemical Sciences and Engineering Division, Argonne National Laboratory , Lemont, Illinois 60439, United States., Polzin BJ; Chemical Sciences and Engineering Division, Argonne National Laboratory , Lemont, Illinois 60439, United States., Wood DL 3rd; Energy & Transportation Science Division, Oak Ridge National Laboratory , One Bethel Valley Road, P. O. Box 2008, Oak Ridge, Tennessee 37831, United States.; Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee , 418 Greve Hall, 821 Volunteer Boulevard, Knoxville, Tennessee 37996, United States.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2017 Jun 07; Vol. 9 (22), pp. 18799-18808. Date of Electronic Publication: 2017 May 23.
DOI: 10.1021/acsami.7b03617
Abstrakt: This study aims to explore the correlations between electrolyte volume, electrochemical performance, and properties of the solid electrolyte interphase in pouch cells with Si-graphite composite anodes. The electrolyte is 1.2 M LiPF 6 in ethylene carbonate:ethylmethyl carbonate with 10 wt % fluoroethylene carbonate. Single layer pouch cells (100 mA h) were constructed with 15 wt % Si-graphite/LiNi 0.5 Mn 0.3 CO 0.2 O 2 electrodes. It is found that a minimum electrolyte volume factor of 3.1 times to the total pore volume of cell components (cathode, anode, and separator) is needed for better cycling stability. Less electrolyte causes increases in ohmic and charge transfer resistances. Lithium dendrites are observed when the electrolyte volume factor is low. The resistances from the anodes become significant as the cells are discharged. Solid electrolyte interphase thickness grows as the electrolyte volume factor increases and is nonuniform after cycling.
Databáze: MEDLINE
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