A novel boron-based ionic liquid electrolyte for high voltage lithium-ion batteries with outstanding cycling stability. (1st September 2018)

• Record Type: Journal Article
• Authors: Liang, Fuxiao; Yu, Jiali; Chen, Jiahui; Wang, Dong; Lin, Chengdong; Zhu, Caizhen; Wang, Mingliang; Dong, Liang; Li, Cuihua
• Is Part Of: Electrochimica acta. Volume 283(2018)
• Page Start: 111
• Page End: 120
• Publication Date: 2018-09-01
• Subjects: Lithium ion battery -- Boron-based ionic liquid -- Al corrosion -- High voltage -- Spinel LiNi0.5Mn1.5O4; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.06.170
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Advanced ionic liquid-based electrolyte is herein characterized for the application in high voltage lithium-ion batteries. The electrolyte based on N-propyl-N-methylpiperidiniumdifluoro(oxalate)borate (PP13 DFOB), lithium bis(trifluoromethanesulfonyl)-imide (LiTFSI) and dimethyl carbonate (DMC) is fully characterized in terms of anodic corrosion behavior, electrochemical properties and cathode-electrolyte interphase stability. Experimental and computational results show that the preferential oxidation of PP13 DFOB results in a stable and low impedance solid electrolyte interface (SEI) film on the surface of LiNi0.5 Mn1.5 O4 (LNMO) cathode and a passivation layer on Al foil, which suppress transition metal dissolution and Al corrosion at high voltage. As a result, the Li/LNMO and Li/graphite coin cells with ionic liquid-based electrolyte achieve excellent electrochemical performance, displaying a discharge capacity of 121.2 mAh g −1 and 369.2 mAh g −1 after 100 cycles at 0.5 C respectively and demonstrating no distinct capacitance attenuation during charge-discharge cycles.