Lithium Secondary Batteries Using a Lithium Nickelate-Based Cathode and Phosphonium Ionic Liquid Electrolytes

Diphenylphosphino Styrene‐Containing Homopolymers: Influence of Alkylation and Mobile Anions on Physical Properties

“…Phosphonium‐containing polymers receive continued interest due to their unique physical properties and suitability for electro‐active membrane technologies, ranging from anion‐exchange membranes in alkaline fuel cells to high‐temperature aerospace applications . Their enhanced thermal and chemical stability, and improved ion conductivity over ammonium analogs enables these advanced technologies in energy generation and storage devices . Increasing the atomic radii from a cationic nitrogen to cationic phosphorus affords phosphonium‐containing compositions with enhanced cationic strength in comparison to ammonium‐analogues, attributing to their improved physical and chemical properties .…”

One ether-functionalized guanidinium ionic liquid as new electrolyte for lithium battery

“…The viscosity of the ether-functionalized guanidinium IL in this study was 58 mPa s at 25 • C. Compared with the other ILs which have been used in lithium battery without additives, the viscosity of the IL was slightly higher than EMI-FSI, P13-FSI and P222(2o1)-TFSI, and lower than PP13-TFSI, DEME-TFSI and several other quaternary ammonium-based ILs [3,4,14,20]. The viscosity increased and conductivity decreased after dissolving Lithium salts in this IL.…”

“…The first category contains tetraalkylammonium, pyrrolidinium, piperidinium and quaternary phosphonium ILs, which have better electrochemical stability and possess sufficiently lower cathodic limiting potentials to allow the deposition of lithium [12][13][14]. For example, N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13-TFSI) N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (P13-FSI), N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium bis(trifluoromethanesulfonyl)imide (DEME-TFSI) and triethyl(2-methoxyethyl) phosphonium bis(trifluoromethanesulfonyl)imide (P222(2o1)-TFSI) have been reported to own good cycle performance when they are used in lithium battery at low rate without additives [3,4,[15][16][17][18][19][20]. The second category includes imidazolium and guanidinium ILs, which have narrower electrochemical windows and higher cathodic limiting potentials compared with the first category.…”

Conductivity and Viscosity Behavior of Asymmetric Phosphonium Iodides

“…Accordingly, at low V j , we find a group of inorganic molten salts, whose main characteristic is a very high electrostatic ion attraction in their crystal lattices. On the other side, we find a wide variety of alkyl ammonium salts and some alkylphosphonium 19 and bis(trifluoromethanesulfonyl)imide salts. We should note the relatively long aliphatic chains of these compounds, and an increase in T g as chain size increases as well.…”