Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6606783 | Electrochimica Acta | 2016 | 26 Pages |
Abstract
Charge and discharge properties of spinel LiNi0.5Mn1.5O4 positive electrodes were investigated using propylene carbonate (PC)-based concentrated electrolyte solutions in the range of 0.83 (ca. 1 mol dmâ3) to 4.45 (nearly saturated) mol kgâ1. The solvation state of PC in the concentrated electrolyte solution was studied by Raman spectroscopy. The HOMO energy of PC in Li+(PC)n was evaluated by first-principle calculation to assess the oxidative stability of PC molecules solvating lithium ion. Charge and discharge measurements revealed that the irreversible capacity due to solvent decomposition decreased with increasing the concentration of LiPF6, while discharge capacity increased. In addition, cycle performance of LiNi0.5Mn1.5O4 positive electrodes was remarkably improved by the use of graphitized Ketjenblack as a conductive additive.
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Authors
Takayuki Doi, Rin Masuhara, Michihiro Hashinokuchi, Yusuke Shimizu, Minoru Inaba,