Tris(pentafluorophenyl)silane as an Electrolyte Additive for 5 V LiNi0.5Mn1.5O4 Positive Electrode. Issue 6 (1st January 2016)

• Record Type: Journal Article
• Authors: Lee, Tae Jin; Lee, Jeong Beom; Yoon, Taeho; Kim, Daesoo; Chae, Oh B.; Jung, Jiwon; Soon, Jiyong; Ryu, Ji Heon; Kim, Jae Jeong; Oh, Seung M.
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 6(2016)
• Page Start: A898
• Page End: A903
• Publication Date: 2016-01-01
• Subjects: Electrolyte additive -- High-voltage positive electrode -- Lithium-ion battery -- Nickel-doped manganese spinel -- Tris(pentafluorophenyl)silane; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0501606jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Tris(pentafluorophenyl)silane (TPFPS) is tested as a film-forming agent for nickel-doped manganese spinel (LiNi0.5 Mn1.5 O4, LNMO) positive electrode. The surface film derived from the TPFPS-free electrolyte (organic carbonate-based one) is poorly passivating the high-voltage positive electrode to cause continued electrolyte oxidation and film deposition. It leads to an increase in the film resistance and thus electrode polarization eventually causing capacity fading. In contrast, the surface film derived from the oxidation of TPFPS prior to the carbonate-based solvents is highly passivating. As a result, additional electrolyte decomposition is suppressed to give a higher Coulombic efficiency for the Li/LNMO cells. In addition, insignificant film growth/electrode polarization allows a much improved capacity retention.