Polymeric ionic liquid–ionic plastic crystal all-solid-state electrolytes for wide operating temperature range lithium metal batteries

Abstract

Solid polymer electrolytes show flexible mechanical characters, excellent electrochemical properties, and impressive battery performance over a wide temperature range.

Organic Ionic Plastic Crystal‐polymer Solid Electrolytes with High Ionic Conductivity and Mechanical Ability for Solid‐state Lithium Ion Batteries

“…It is interesting to note that all as‐prepared SEs exhibit amorphous structure over the whole temperature range, as illustrated by the absence of endothermic/exothermic peaks, which is proved by the X‐ray diffraction (XRD) analysis ( Figure (b) ). This phenomenon can also be observed in other polymer‐plastic crystal electrolytes, such as PIL‐P 12 FSI‐LiTFSI and P(VDF‐HFP)‐SN‐LiTFSI SEs.…”

“…Thus, OIPC‐lithium salt‐polymer ternary system is expected to attain high ionic conductivity and good mechanical performance. Our recent work reports a kind of OIPC‐lithium salt‐polymer SEs, wherein N ‐ethyl‐ N‐ methyl pyrrolidinium bis(fluorosulfonyl)imide (P 12 FSI), LiTFSI and pyrrolidinium‐based polymeric ionic liquid are chosen as OIPC, lithium salt and polymer, respectively. Such SEs presents a relatively high ionic conductivity of 3.33 × 10 −4 S cm −1 at 40 °C.…”

Poly(ionic liquid) composites

“…For example, a PIL-based gel polymer electrolyte was prepared by mixing N-ethyl-N-methylpyrrolidinium TFSI (P12FSI) and a pyrrolidinium-based PIL and LiTFSI in acetone, which was drop-cast into a membrane. 68 The charged PIL macromolecular structure was associated with ILs and Li + via electrostatic and coordination interactions. This membrane composite was flexible and thermally and electrochemically stable and carried a desirable room temperature ionic conductivity and good interfacial stability with the lithium metal.…”

“…The chemical affinity between PILs and ILs prevents them from phase separation; additionally, in comparison with traditional solid electrolytes, the resulting composite electrolytes are provided with outstanding integrated performances, including a high ion conductivity, a wide electrochemical window, a favorable plating morphology of the Li metal, and a device that does not leak and is noncombustible at room temperature. 68 Zhou et al fabricated a hierarchical PIL-based solid electrolyte (HPILSE) by integrating a PDADMADTFSI porous membrane and a polymerized 1,4-bis-[3-(2-acryloyloxyethyl)imidazolium-1-yl]butane TFSI (C1-4TFSI) cross-linking network within an IL 1-ethyl-3-methylimidazolium TFSI (EMITFSI)-based electrolyte, where the cross-linked C1-4TFSI maintained the entire mixture in a quasi-solid-state to avoid liquid leakage even at high temperature. The as-prepared PDADMADTFSI porous membrane and a suitable amount of the EMITFSI-based electrolyte provided a tensile strength of 2.4 MPa and an ion conductivity above 10 À3 S cm À1 at 25 1C.…”

Rational Design of an Ionic Liquid‐Based Electrolyte with High Ionic Conductivity Towards Safe Lithium/Lithium‐Ion Batteries

“…[2][3][4] Especially,t he pyrrole ionic liquids have nonaromatic cation pyrrolidinium could provide as uperior cathodic stability, transportp roperties and good interphasial behavior on metallic lithium surface, are considered to be the most promising room temperature ionic liquids( RTIL) for lithium/lithium-ion battery. [5,6] However,t his class of ILs is generally suffered from low ionic conductivity andh igh viscosity,w hich hinder them to be used in practice. To overcome these disadvantages, some functional groups are introduced to the cations of ILs to improvet he properties of ILs, [7][8][9] and some appropriate organic additives are mixed with ILs to reduce its viscosity,r esulting in better performance, but without compromising the safety.…”