Diphenyloctyl phosphate and tris(2,2,2-trifluoroethyl) phosphite as flame-retardant additives for Li-ion cell electrolytes at elevated temperature

3, 3’-sulfonyldipropionitrile: A novel additive to improve the high temperature performance of lithium-ion battery

“…6. The typical EIS of the Li-ion cells is composed of a high-frequency semicircle, a mid-frequency semicircle and a straight slopping line at the low frequency end [13,[16][17][18]. In the equivalent circuit (Fig.…”

Additives for Functional Electrolytes of Li-Ion Batteries

“…Phosphorous additives may not be as effective as the halogenated ones, but they are less toxic and more environmentally friendly. Examples of such additives include alkyl phosphates [87,115,164], aryl phosphates [43, 117,133,176], mixed alkyl aryl phosphates [95,114], alkyl phosphites [97,164], alkyl phosphonates [148], phosphonamidate [51], phosphazenes [5,40], and some other phosphorous compounds [141,175]. Halogenated phosphorous additives have primarily been fluorinated ones, as many of the fluorinated alkyl solvents themselves are non-flammable.…”

“…Halogenated phosphorous additives have primarily been fluorinated ones, as many of the fluorinated alkyl solvents themselves are non-flammable. Examples include tris(2,2,2-trifluoroethyl) phosphite [95,174], tris(2,2,2-trifluoroethyl) phosphate [134,153], tris(pentafluorophenyl) phosphine [155], and bis(2,2,2-trifluoroethyl) methylphosphonate [165]. Chlorinated tris (2-chloroethyl) phosphate has also been reported to be effective in flame suppression and even enhanced the electrochemical performance of the cell [116].…”

Effect of flame-retarding additives on surface chemistry in Li-ion batteries

“…Previous studies [12][13][14][15][16] reported the promising potential of vinylene carbonate (VC), vinyl ethylene carbonate (VEC), and diphenyloctyl phosphate (DPOF) as flame-retardant additives to improve the cell performance and thermal stability of Li-ion batteries due to the formation of SEI on the surface electrodes. However, chemical processes, mechanism, and techniques for the specific identification of surface species are questionable.…”