Surface-functionalized polyphenylene sulfide, solid-liquid two-phase electrolyte and preparation method

Abstract

The invention relates to the field of new energy materials, and discloses surface-functionalized polyphenylene sulfide, a solid-liquid two-phase electrolyte and a preparation method. The structure of the surface-functionalized polyphenylene sulfide is shown in the description, wherein a functionalized molecule R is an organic metal ion-free complexing agent of an oxygen-containing double-bond phenyl molecule with an anion binding effect; the metal cation M is Li+, Na+, Mg2+, Ca2+, Al3+ or K+; the anion X is Cl-, F-, BF4- or PF6-; and n is 30-150. The prepared polyphenylene sulfide-based solid-liquid two-phase electrolyte contains a small amount of liquid phase, and the volume ratio of the solid phase to the liquid phase is 5-15: 1. The metal cations pinned in the polyphenylene sulfide powder are separated from a solid phase, effective conduction is formed among the powder, the conductivity of the metal cations is greatly improved, functional molecules and anions X introduced to the surface of the material can be effectively bound, and the material becomes an excellent conductor of a single metal cation.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a surface-functionalized polyphenylene sulfide, a solid-liquid dual-phase electrolyte and a preparation method. Background technique [0002] Lithium-ion batteries (LIBs), are considered to be the most promising energy storage technology due to their relatively high energy density. Conventional lithium-ion batteries usually use organic liquid electrolytes, which have relatively high ionic conductivity, but have serious safety issues, short lifespan, high cost, and low power density. However, all-solid-state lithium batteries using non-flammable solid electrolytes can avoid some problems, especially safety issues. Relatively speaking, all-solid-state lithium batteries have better safety performance, longer cycle life, and higher energy density. However, the high interfacial impedance between the cathode and the solid-state electrolyte and the poor room temperature ionic condu...

AI Technical Summary

Problems solved by technology

However, the high interfacial impedance between the cathode and the solid-state electrolyte and the poor room temperature ionic conductivity are one of the main shortcomings that need to be overcome for the commercialization of lithium-ion solid-state batteries.

The current solid electrolytes are mainly inorganic ceramic electrolytes (such as Li 5 La 3 Zr 2 o 12 ) and organic electrolytes (such as PEO, PVDF, etc.), inorganic ceramic electrolytes are known for their high lithium ion conductivity (10 −4 to 10 −2 S cm −1 ) has received extensive attention, but this type of material has poor mechanical processing performance and difficult film formation, especially the extremely harsh processing environment requirements for sulfide electrolytes, and there is still a long way to go for engineering and commercialization

The organic electrolyte is easy to process into a film and can be processed and produced roll-to-roll, but the conductivity of this type of organic electrolyte is low, only 10 −8 to 10 −5 S cm −1 , cannot be used normally at room temperature, which also limits the further large-scale promotion of this type of material

Images