title: Sub-2 nm Thick Fluoroalkylsilane Self-Assembled Monolayer-Coated High Voltage Spinel Crystals as Promising Cathode Materials for Lithium Ion Batteries.
abstract: We demonstrate herein that an ultra-thin fluoroalkylsilane self-assembled monolayer coating can be used as a modifying agent at LiNi0.5Mn1.5O4-δcathode/electrolyte interfaces in 5V-class lithium-ion batteries. Bare LiNi0.5Mn1.5O4-δ cathode showed substantial capacity fading, with capacity dropping to 79% of the original capacity after 100 cycles at a rate of 1C, which was entirely due to dissolution of Mn(3+) from the spinel lattice via oxidative decomposition of the organic electrolyte. Capacity retention was improved to 97% on coating ultra-thin FAS17-SAM onto the LiNi0.5Mn1.5O4 cathode surface. Such surface protection with highly ordered fluoroalkyl chains insulated the cathode from direct contact with the organic electrolyte and led to increased tolerance to HF.
authors.affiliation: Center for Energy and Environmental Science, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.|Department of Materials Chemistry, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Zettsu
authors.affiliation: Department of Materials Chemistry, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
authors.forename: Satoru
authors.initials: S
authors.lastname: Kida
authors.affiliation: Department of Materials Chemistry, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Uchida
authors.affiliation: Center for Energy and Environmental Science, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.|Department of Materials Chemistry, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
authors.forename: Katsuya
authors.initials: K
authors.lastname: Teshima