New trivalent imidazole-derived salt for lithium-ion cell electrolyte

Metal- and covalent-organic frameworks as solid-state electrolytes for metal-ion batteries

“…Such electrolytes still possess an advantageously high density of anionic hopping sites and the safety features of solid electrolytes, but obtaining higher metal cation transference numbers will likely be a challenge due to the large percentage of mobile anions. An interesting extension upon this work could involve soaking the COF in a polylithium salt [63][64][65][66][67]. This could yield the COF with equal equivalents of the polyanion immobilized within the channels, triaminoguanidinium groups within the framework itself and mobile Li + .…”

High-symmetry hydrogen-bonded organic frameworks: air separation and crystal-to-crystal structural transformation

“…Accordingly, we synthesized benzo-tris((trisfluoromethyl)imidazole) (2). 8 Due to the pendant CF 3 groups, 2 is highly soluble in common polar organic solvents (MeOH, EtOH, MeCN, DMSO, etc.) and slightly soluble in less polar ones (CH 2 Cl 2 , CHCl 3 , toluene and benzene, etc.).…”

Polyhedral Oligomeric Silsesquioxane-Based Macroanions to Level Up the Li+ Transport Number of Electrolytes for Lithium Batteries

“…16 Multicharge anions were also developed to obtain an additional diminution of salt pairing and aggregation 18−20 with a t Li + of 0.73 for the trilithium 2,2′,2″-tris(trifluoromethyl)benzotris(imidazolate) (Li 3 BTI) salt in carbonate solvents. 20 Anionic polymers dissolved in a nonaqueous solvent such as dimethyl sulfoxide and used as liquid electrolytes are also a good compromise to attain both high room temperature conductivity (10 −3 S cm −1 ) and t Li + (0.8). 21 Macroanions based on the grafting of anions onto inorganic nanoparticles such as SiO 2 22−24 have recently gained some interest due to their attractive synergy between conductivity and improvement of mechanical properties.…”

“…In liquid electrolytes, the ionic mobility is inversely proportional to the size of the solvated ion due to the viscous hindrance of the liquid electrolyte (Stokes–Einstein relationship); thus, a simple strategy is to replace conventional compact anions such as PF 6 – with bulky anions, referred to as macroanions. − For example, by attaching a longer chain to the BF 4 – anion, a slight increase in t Li + to 0.48 was reported in a propylene carbonate solvent . Multicharge anions were also developed to obtain an additional diminution of salt pairing and aggregation − with a t Li + of 0.73 for the trilithium 2,2′,2″-tris­(trifluoromethyl)­benzotris­(imidazolate) (Li 3 BTI) salt in carbonate solvents . Anionic polymers dissolved in a nonaqueous solvent such as dimethyl sulfoxide and used as liquid electrolytes are also a good compromise to attain both high room temperature conductivity (10 –3 S cm –1 ) and t Li + (0.8) …”