Diethyl(thiophen-2-ylmethyl)phosphonate: a novel multifunctional electrolyte additive for high voltage batteries

Abstract

DTYP exhibits multiple functionalities that dramatically improve the performance of a high voltage Li-ion cell using LiNi0.5Mn1.5O4 at elevated temperature.

Recent Advances in Non-Flammable Electrolytes for Safer Lithium-Ion Batteries

“…Figure 18 shows the flammability tests and the cycling performance of the batteries with and without DTYP electrolyte. The addition of 0.5% of diethyl(thiophen-2-ylmethyl) phosphonate (DTYP) additive to the base electrolyte aided in improving the capacity retention of a high-voltage Li-ion cell using LiNi 0.5 Mn 1.5 O 4 from 18% to 85% after 280 cycles at 1C at 60 • C. The novel electrolyte also aided in reducing the self-extinguishing time of the electrolyte from 88 s to 77 s [58]. Figure 18 shows the flammability tests and the cycling performance of the batteries with and without DTYP electrolyte.…”

“…(a) Flammability tests of the PE membrane with base and DTYP-containing electrolytes. (b) The cycling performance of the batteries with the base and DTYP-containing electrolytes[58]. Reprinted with permission, © 2018.…”

Recent research progresses in ether‐ and ester‐based electrolytes for sodium‐ion batteries

“…The second popular sodium salt is NaPF 6 , which still seems to be the most promising option for practical applications, although it is sensitive to water, easily evolving highly corrosive HF. The generated HF can react with the alkaline components of the SEI and then weaken the rigid SEI film by promoting a high level of harmful gases in the battery system . So, it is commonly considered as the main culprit behind a fragile SEI.…”

“…The generated HF can react with the alkaline components of the SEI and then weaken the rigid SEI film by promoting a high level of harmful gases in the battery system. 55,56 So, it is commonly considered as the main culprit behind a fragile SEI. NaPF 6 is much more electrochemically stable than LiPF 6 , however .…”

Effects of Charge Cutoff Potential on an Electrolyte Additive for LiNi0.6Co0.2Mn0.2O2–Mesocarbon Microbead Full Cells

“…However, the electrochemical operation window of traditional electrolytes is limited, as they act as the “blood” of LIB systems, being not only responsible for transmitting Li + ions but also participating in the formation of a stable solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) during the cycles, as well as stabilizing them in subsequent cycles . Two approaches are commonly used to obtain compatible electrolytes: either by increasing the intrinsic oxidation stability of electrolytes using novel solvents or lithium salts, or by developing functionalized electrolyte additives . As for the later, film‐forming additives can protect the electrode from degradation, while scavenging additives can inhibit the generation of HF and other harmful substances .…”