LiBF4-Based Concentrated Electrolyte Solutions for Suppression of Electrolyte Decomposition and Rapid Lithium-Ion Transfer at LiNi0.5Mn1.5O4/Electrolyte Interface. Issue 10 (1st January 2016)

• Record Type: Journal Article
• Authors: Doi, Takayuki; Shimizu, Yusuke; Hashinokuchi, Michihiro; Inaba, Minoru
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 10(2016)
• Page Start: A2211
• Page End: A2215
• Publication Date: 2016-01-01
• Subjects: High potential -- Lithium tetrafluoroborate -- Lithium-ion battery -- Lithium-ion transfer -- Propylene carbonate; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0331610jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Charge and discharge properties of spinel LiNi0.5 Mn1.5 O4 positive electrodes were investigated using concentrated LiBF4 /propylene carbonate (PC) electrolyte solutions in the range of 0.833 (ca. 1 mol dm −3 ) to 7.25 (nearly saturated) mol kg −1 . The irreversible decomposition of electrolyte solution was effectively suppressed with an increase in concentration. In addition, the polarization in charge/discharge reactions remained small in the nearly saturated 7.25 mol kg −1 LiBF4 /PC even though the viscosity was very high and the ionic conductivity was low. The rate capability was higher than that obtained with nearly saturated 4.3 mol kg −1 LiPF6 /PC. The structure, viscosity, and ionic conductivity of the concentrated LiBF4 /PC were investigated. Based on the experimental results, the rapid charge/discharge reactions at LiNi0.5 Mn1.5 O4 electrodes were discussed.