Nitrile functionalized disiloxanes with dissolved LiTFSI as lithium ion electrolytes with high thermal and electrochemical stability

Nitrile functionalized silyl ether with dissolved LiTFSI as new electrolyte solvent for lithium-ion batteries

“…The LiFePO 4 (LFP) electrodes consisted of 90 % LiFePO 4 (P2, Süd-Chemie), 5 % sodium carboxymethyl-cellulose (Na-CMC, WALO-CELTM) and 5 % carbon black (Super C65 1 , IMERYS), using a method published earlier [2]. From the dry electrode sheets, discs of 12 mm diameter were punched and dried for 48 h (100 C at 10-6 mbar).…”

“…In the last few years, low molecular weight disiloxanes [1][2][3][4][5][6] and silyl ethers [7][8][9][10][11][12][13] were investigated as non-volatile, temperature stable and environmentally friendly electrolyte solvents presenting an alternative to replace commonly used carbonate solvents with low vapor pressures and less flammability which improves the safety of lithium-ion batteries [11,14]. Most silicon-based electrolyte solvents were functionalized with oligoether groups in order to assist the dissociation of lithium salts [5,9,11,13].…”

“…Until now, moderate efforts have been done to enhance oxidation stability by partially substituting ether groups with more stable nitrile groups, but no complete substitution of ether groups has been tried yet [7,16]. In recent publications, we introduced a dinitrile-functionalized disiloxane solvent which showed high electrochemical and thermal stability as well as high ionic conductivities of dissolved lithium salts [1,2].…”

Effect of the electrolytic solvent and temperature on aluminium current collector stability: A case of sodium-ion battery cathode

“…Most of the literature related to FSI À and TFSI À containing metallic salts dissolved in ILs correspond to Li-based compounds. Concretely, LiFSI and LiTFSI-based electrolytic solutions in ILs such as nitrile functionalized disiloxanes [20] and those composed of TFSI À or FSI À anions with cations containing piperidinium [21], pyrrolidinium [17,18,22] or imidazolium [14,23] groups are reported not to promote Al oxidative dissolution.…”

Highly conductive solvent-free polymer electrolyte membrane for lithium-ion batteries: Effect of prepolymer molecular weight

“…A notable example is due to Ha et al who demonstrated that in their SCN containing PEM, the retention of the graphite/PEM/LiCoO 2 full cell was only 56% (after 30 cycles at 0.1C)[19].Various factors can be involved in the capacity decay issue because battery capacity can be affected by each part in the battery assembly. Possible reasons are the corrosion of aluminum current collector at high voltage due to LiTFSI[37,44], irreversible redox reactions of electrolyte components that occurred on the interface of electrolyte and electrode (ineffective solid electrolyte interface formation)…”