Polyp-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide-polyvinylidene carbonate copolymer and application thereof

Abstract

The invention belongs to the technical field of polymer synthesis and discloses a polyp-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide-polyvinylidene carbonate copolymer and application thereof. The copolymer is synthesized by the following steps: adding a p-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide monomer, a vinylidene carbonate monomer and a catalyst into a solvent I andperforming polymerization reaction at 70 to 100 DEG C, wherein the p-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide monomer is prepared by the steps of performing reaction on sodium p-styrenesulfonate and sulfoxide chloride in a solvent at -10 to 25 DEG C, adding an acid-binding agent, an activating agent and trifluoromethyl sulfonamide and performing reaction at -10 to 25 DEG C; addingpotassium carbonate and performing reaction at 25 to 70 DEG C; and adding lithium perchlorate and performing reaction at 25 to 60 DEG C. The copolymer provided by the invention has high lithium ion migration number and room-temperature conductivity, is simple in preparation method, can realize large-scale production and can serve as lithium ion battery electrolyte.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and more specifically relates to a poly(p-styrenesulfonyl)imide lithium-polyvinylidene carbonate copolymer and an application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output power, and wide operating temperature range, and are widely used in smart portable devices and new energy vehicles. At present, the research on lithium-ion batteries mainly focuses on the positive and negative electrode materials, while the research on the electrolyte, which is an essential component of the battery, is less. Commercial lithium-ion batteries mainly use liquid electrolytes, including inorganic lithium salts and polymer gel systems. All-solid polymer electrolytes have high specific energy, high power, long cycle life, and flexible design in a wide temperature range. , It can avoid the safety problems such as leakage and explosion of ...

AI Technical Summary

Problems solved by technology

[0003] Current research hotspots mainly focus on inorganic lithium salt-doped polyethylene oxide-based copolymers, but their room temperature conductivity (-4 S / cm) cannot meet the actual needs of lithium-ion battery applications (10 -3 S / cm), the lithium ion migration number is low (0.2-0.5), and it is not compatible with electrode materials

At the same time, during the charge and discharge process, anions will gather at the electrode / electrolyte interface, concentration polarization will occur, and a polarization voltage opposite to the applied electric field will be generated, which will hinder ion migration, reduce the stability of charge and discharge current, and reduce energy efficiency and service life.

Images