Effects of Butadiene Sulfone as an Electrolyte Additive on the Formation of Solid Electrolyte Interphase in Lithium-Ion Batteries Based on Li4Ti5O12 Anode Materials

Abstract

In this study, butadiene sulfone (BS) was selected as an efficient electrolyte additive to stabilize the solid electrolyte interface (SEI) film on the lithium titanium oxide (LTO) electrodes in Li-ion batteries (LIBs). It was found that the use of BS as an additive could accelerate the growth of stable SEI film on the LTO surface, leading to the improved electrochemical stability of LTO electrodes. It can be supported by the BS additive to effectively reduce the thickness of SEI film, and it significantly enhances the electron migration in the SEI film. Consequently, the LIB-based LTO anode in the electrolyte containing 0.5 wt.% BS showed a superior electrochemical performance to that in the absence of BS. This work provides a new prospect for an efficient electrolyte additive for next-generation LIBs-based LTO anodes, especially when discharged to low voltage.

Thermal stability analysis of nitrile additives in LiFSI for lithium-ion batteries: An accelerating rate calorimetry study

“…As most fire incidents originate from internal material failures rather than external causes, internal methods are often more effective in ensuring battery safety. Strategies such as modification at the cathode/anode interface [ [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] ], thermally switchable current collectors [ 20 ], thermal shutdown separators [ 21 , 22 ], multifunctional electrolytes [ 23 ], and flame-retardant electrolyte additives [ [24] , [25] , [26] , [27] , [28] , [29] , [30] ] can address these challenges. Presently, the most commonly utilized salt in electrolytes is lithium hexafluorophosphate (LiPF 6 ) and the most commonly used carbonate solvents are ethylene carbonate (EC) and dimethyl carbonate (DMC).…”

“…These additives function either chemically or physically in both condensed and vapor phases, thereby disrupting the combustion process during heating, pyrolysis, ignition, or flame spread [ 42 , 43 ]. Some recent studies have advocated the use of several nitrile-based additives in LIB electrolytes for suppressing the thermal runaway of LIB cells [ [26] , [27] , [28] , [29] , [30] , [44] , [45] , [46] , [47] ]. Succinonitrile (SN, NC−CH 2 −CH 2 −CN), a representative molecular non-ionic plastic crystal that shows plastic behavior at high temperatures, is attracting increasing interest because it exhibits high boiling point (267 °C) with negligible vapor pressure, and has lower flammability at high temperatures.…”

Modulating Solvent Layer Structure of Li+ to Achieve a Stable High-Voltage Electrolyte for Lithium-Ion Batteries

“…Sulfur-containing additives are the most widely used electrolyte additives, which can be used as positive electrode film-forming additives, , and the generated density film on the surface of cathode is conducive to the transfer of Li + . Among them, sulfones, which are characterized by the connection of sulfonyl groups and carbon atoms, have been used in the research of new high-voltage electrolyte due to their wide electrochemical window and high dielectric constant. , Though its high viscosity restricts sulfones as an ideal high-voltage electrolyte solvent, adding them to the electrolyte in the form of additives can effectively reduce the disadvantages brought by high viscosity. Tetramethylene sulfone (TS), as a common industrial product, has the characteristics of high-voltage stability (>6.0 V), high dielectric constant, high flash point, large output, and low price and is expected to become an additive for high-voltage electrolyte …”