Lithium trifluorosulfonimide salt containing siloxane-based electrolytes for lithium-ion batteries: Aluminum corrosion behaviors and electrochemical properties

Salt-Concentrated Siloxane-Based Electrolytes for Lithium Metal Batteries: Physical Properties, Electrochemical Properties, and Cell Performance

“…The structural characterization of the 390EO was confirmed using Fourier transform infrared spectroscopy (FTIR) and 1 H and 29 Si nuclear magnetic resonance (NMR), and the positional relationships between protons and silicon atoms were confirmed using 2D NMR ( 1 H− 1 H COSY and 1 H− 29 Si HMBC). 10 The reference values for 390EO; 10 FT-IR (cm −1 ): 1 H NMR (ppm) (600 MHz, deuterated DMSO): 3.8 (c, 6H, SiOCH 2 ); 3.4 (d, 6H, CH 2 OCH 3 ); 3.25 (e, 9H, OCH 3 ); 0.5 (b, 4H, SiCH 2 CH 2 ); 0.1 (a, 33H, (CH 3 ) 3 SiO and (CH 3 )SiOCH 2 ), 29 Si NMR (ppm) (600 MHz, deuterated DMSO): 6.89 ( As reported in our recent study, the molecular weight of 390EO was determined based on the 1 H NMR spectroscopy results and by comparing the integral ratio of the Si−H group (−Si−H; 4.75 ppm, H k ) to that of Si−CH 3 at 0.157 ppm (H a ). The MW NMR of 390EO is 1684 g mol −1 (n = 5).…”

“…The data of conductivity, viscosity, and transference number related to 20/1 (390EO/LiTFSI; EO/Li = 20/1) have been previously published. 10 The electrochemical window of the electrolyte was evaluated by performing linear sweep voltammetry (LSV) at a scan rate of 1 mV s −1 with a coin cell (CR2031) comprising a SS working electrode, and Li metal as reference and counter electrodes (Scheme S1d). The LSV and cycling voltammetry (CV) were conducted on the prepared electrolytes using the Solartron from 2 to 6 V (at 25 and 60 °C) and from −0.5 to 3 V (at RT and 60 °C) (vs REF) potential ranges, respectively, at a sweep rate of 1 mV s −1 .…”

“…In addition, superior conductivities of liquid electrolytes can be achieved in a single system using low viscosity and nonflammable siloxane-based salt-concentrated electrolyte systems. In contrast, organosiloxane polymers are durable under overcharge and high-voltage conditions; , moreover, they can be nonflammable, even under harsh and extreme conditions, , owing to their high antioxidative ability, ,, excellent thermal resistance, , and facile chemical modifications. − Furthermore, organosiloxane polymers are compatible with lithium metal anodes, , with a passive film formation ability at the electrode–electrolyte interface. , The individual structure of the macromolecular organosilicon member, double-decker silsesquioxane (DDSQ), was first used as a proton conducting member for fuel cells in 2011 and, until recently, organosilicon materials have not received significant research attention. In the last five years, polysiloxanes have become increasingly popular in various battery technologies by being used as a single-ion conducting polymer electrolyte , or a coating material for Li metal, and even as a scaffold for LIB ionic liquids .…”

“…9 In addition, superior conductivities of liquid electrolytes can be achieved in a single system using low viscosity and nonflammable siloxanebased salt-concentrated electrolyte systems. In contrast, organosiloxane polymers are durable under overcharge and high-voltage conditions; 10,11 moreover, they can be nonflammable, even under harsh and extreme conditions, 12,13 owing to their high antioxidative ability, 10,11,13 excellent thermal resistance, 14,15 and facile chemical modifications. 16−18 Furthermore, organosiloxane polymers are compatible with lithium metal anodes, 11,19 with a passive film formation ability at the electrode−electrolyte interface.…”

“…11 In contrast, our other study demonstrated that some interactions occur between the siloxane polymer, particularly the Si-tripodant centers and the counter anion; these interactions effectively increase the t Li+ of the system as well as the electrochemical stability of the salt. 10 Herein, we report a new class of concentrated electrolyte systems based on the oxidative stable siloxane polymer solvent and amide salt LiTFSI. LiTFSI salt-concentrated siloxanebased electrolytes were prepared by applying oligo(methyl(2-(tris(2-H methoxyethoxy)silyl)ethyl)siloxane)) grafted with Sitripodant centers (390EO).…”