Journal
ELECTROCHIMICA ACTA
Volume 209, Issue -, Pages 219-224Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.05.062
Keywords
LiNi0.5Mn1.5O4; High-potential positive electrode; Concentrated electrolyte; Propylene carbonate; Lithium-ion battery
Categories
Funding
- the Super Cluster Program from MEXT
- the Super Cluster Program from JST
- Kyoto Regional Scientific Innovation Hub from MEXT
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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 dm(-3)) to 4.45 (nearly saturated) mol kg(-1). 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. (C) 2016 Elsevier Ltd. All rights reserved.
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