Phosphorus derivatives as electrolyte additives for lithium-ion battery: The removal of O 2 generated from lithium-rich layered oxide cathode

Tris(2,2,2-trifluoroethyl) phosphite as an electrolyte additive for high-voltage lithium-ion batteries using lithium-rich layered oxide cathode

“…Lee et al confirmed by a 31 P NMR and study that the use of TEP as an additive reduces the internal pressure by reacting with the oxygenated species that evolves out of the cathode material [53]. In their work, the action of phosphite additives on oxygenated species at lithiumrich cathode, has been provided by 31 P nuclear magnetic resonance (NMR) spectroscopy and gas chromatographyemass spectrometry (GCeMS), which clearly show the presence of reaction products in accordance with the mechanism described here.…”

Tunable and Robust Phosphite-Derived Surface Film to Protect Lithium-Rich Cathodes in Lithium-Ion Batteries

“…Phosphite-based compounds tend to oxidize easily because the energy of their highest occupied molecular orbital (HOMO) is higher than that of the carbonate solvents in the electrolyte, such as ethylene carbonate (EC). Recently, substituted dioxaphosphinane was proposed as an oxidative additive to suppress the decomposition of the main electrolyte's components at the Li-rich cathode, Li 1 42 Li's group investigated the effect of trimethyl phosphite (TMPi) on high-voltage Li-ion cells with a Li-rich layered oxide cathode, Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 . The cell with TMPiadded electrolyte exhibited good capacity retention, improved rate capability of Li-rich layered oxide/Li half cells at room temperature, and slightly enhanced thermal stability of the delithiated cathode in the presence of the electrolyte.…”

Electrolyte Additives for Lithium Metal Anodes and Rechargeable Lithium Metal Batteries: Progress and Perspectives

“…À11.905 eV (EC), À11.821 eV (DMC), and À11.541 eV (EMC)), and readily reacts with the HF in the electrolyte.The TMSP-containing electrolyte inhibited the significant capacity fading of LLO,a nd the capacity retention of the Thehigh cut-off voltage for charging processes raises the concern of losing oxygen from the LLO cathode,p otentially damaging the cathode structure,a nd leading to capacity fading. [83] Anouti and co-workers [68] proposed the use of tris(2,2,2-trifluoroethyl)phosphite (TTFPi)a sa ne fficient oxygen trap and stabilizer additive.T he low oxidation state of phosphorus(III) allows TTFPi to react easily with reactive oxygenated species such as O 2 and O 2 2À to form stable phosphate compounds,t hus protecting the electrolyte from being attacked by active oxygenated species (Scheme 4). The addition of 5wt% TTFP in 1m LiPF 6 -EC/PC/EMC/DMC resulted in the cycling performances of Li/x Li 2 MnO 3 ·(1Àx)LiMO 2 (M = Ni, Co,M n) cells being substantially improved (e.g.2 30 mAh g À1 after 110 cycles).…”