Ionic Liquid-Supported Interpenetrating Polymer Network Flexible Solid Electrolytes for Lithium-Ion Batteries

Abstract

In this report, we have prepared the imidazoliumbased ionic liquid-incorporated interpenetrating polymer network (IPN) electrolyte membrane containing cellulose triacetate with polyethylene glycol dimethyl acrylate and polyethylene oxide by the UV-induced polymerization method. A facile IPN electrolyte membrane appears to be homogeneous in nature with high mechanical strength, excellent thermal stability, and exhibits optimum ionic conductivity of the order of 2.84 × 10 −3 S cm −1 . The oxidative stability of the IPN electrolyte membrane is observed up to 5.2 V at room temperature, which is attributed to immobilized ion networks provided by the imidazolium ionic liquid. The IPN electrolyte membrane is galvanostatically cycled having battery configuration Li/IPN EM/LiFePO 4 , which shows the first discharge capacity of 110 mA h g −1 at 0.05 C with 93.65% Coulombic efficiency at room temperature. The cell shows discharge capacities of about 85, 82, and 76 mA h g −1 at 0.1, 0.2, and 1 C rates, respectively. The ionic liquid-incorporated IPN electrolyte membrane provides a promising system for stabilizing lithium electrodeposition and fabricating high-performance lithium-ion batteries. Finally, IPN electrolyte membranes could be a potential electrolytes for next-generation high-power and safer solid-state battery technology.

Solid polymer electrolyte membrane based on cationic polynorbornenes with pending imidazolium functional groups for all‐solid‐state lithium‐ion batteries

“…From the Figure 9a, it can be seen that the ionic conductivity increased continuously with increasing LiTFSI from 5 to 30 wt%, which the ionic conductivity increased with LiTFSI increased and then the ionic conductivity decreased continuously. The main reason for the large conductivity at the initial stage with increasing lithium salt concentration is that as the LiTFSI content increase, the LiTFSI continue to dissociate to form free mobile carriers, and the ionic conductivity continue to increase 7,12 . We found that the LiTFSI addition is optimal at about 30%, and its ionic conductivity is 3.1 × 10 −5 S cm −1 at 30°C.…”

“…The main reason for the large conductivity at the initial stage with increasing lithium salt concentration is that as the LiTFSI content increase, the LiTFSI continue to dissociate to form free mobile carriers, and the ionic conductivity continue to increase. 7,12 We found that the LiTFSI addition is optimal at about 30%, and its ionic conductivity is 3.1 Â 10 À5 S cm À1 at 30 C. Then as the LiTFSI content continue to increase, the ionic conductivity will start to decrease significantly. The main reasons for the decline: first, a large number of high concentrations of LiTFSI in the polymer system is not "dissolved" but in the form of ion pairs, which do not play a role in ion transport; second, the high concentration of LiTFSI lead to excessive aggregation of ions to form ion clusters, further reduce the effective charge number and ion mobility.…”

“…11 PILs have shown exciting potential to play an important role in lithium-ion batteries due to their completely different physicochemical properties from molecular solvents and inorganic salts, which contain high electrical conductivity, wide chemical window, high electrochemical stability and high thermal property. 12 It can be used as an electrolyte to replace carbonate solvent, show exciting potential for application in lithium-ion batteries that can play an important role. 13 It can also be used as additives in low viscosity conventional electrolytes to obtain composite electrolytes with excellent electrical conductivity and safety.…”

Natural Pyranosyl Materials: Potential Applications in Solid‐State Batteries

“…In addition, when the added plasticizers or liquid electrolytes were ionic materials (e. g. ionic liquids (ILs)), the ions of such materials could also interact with the polysaccharides. On one hand, the interactions between ILs and polysaccharides could inhibit the crystallization of polysaccharides and reduce their crystallinity, thus increasing the ionic conductivity of polysaccharides [59,125,127,128] . The strong intermolecular interactions between the plasticizers such as glycerol and polysaccharides have the similar enhancement effect [129–131] .…”

Spiro-Twisted Benzoxazine Derivatives Bearing Nitrile Group for All-Solid-State Polymer Electrolytes in Lithium Batteries

“…Several attempts have been made to obtain amorphous polyether matrices with adequate mechanical properties to facilitate their use in practical applications. For instance, researchers have used materials such as plasticizers [ 19 , 20 ], organic fillers [ 21 , 22 , 23 ], comb polymers [ 24 , 25 ], and interpenetrating polymer networks (IPNs) [ 26 , 27 , 28 , 29 ] as well as methods such as copolymerization [ 30 , 31 ] and cross-linking [ 32 , 33 , 34 ] to reduce the glass transition temperature and crystallinity of polymers. Cross-linked polymer networks effectively improve the mechanical properties and stability of SPEs.…”