Pre-lithiated polyphenylene sulfide with high lithium solid solubility and preparation method and application thereof

Abstract

The invention provides pre-lithiated polyphenylene sulfide with high lithium solid solubility and a preparation method and application thereof. The preparation method comprises the following steps: dehydrating NMP, Li2S, p-DCB and LiOH; performing polymerization at 220 DEG C; after neutralization, directly evaporating or sublimating the liquid phase to remove NMP and H2O, so the conversion from aproduct to a pre-lithiated reactant is realized in one step, the nanoscale mixing of polyphenylene sulfide and a lithium salt is realized in situ, the added chloride ion complexing agent effectively separates lithium ions from chloride ions, captures the chloride ions, promotes the capture of sulfur sites on polyphenylene sulfide chains to the lithium ions, and improves the solid solubility of lithium; due to the pinning effect of the chloride ion complexing agent on chloride ions, the lithium ion conductivity of the pre-lithiated polyphenylene sulfide is further improved. The solid solubilityof lithium in the crystal structure of the prepared pre-lithiated polyphenylene sulfide is high, chloride ions in the material are effectively bound, and the pre-lithiated polyphenylene sulfide is anexcellent conductor of a single lithium ion.

Description

technical field [0001] The invention relates to a pre-lithiated polyphenylene sulfide with high lithium solid solubility, a manufacturing method and application, and belongs to the technical field of new energy material preparation. Background technique [0002] All-solid-state lithium-ion batteries have attracted increasing attention from industry and academia due to their excellent safety performance and potential high energy density. However, the power density of all-solid-state lithium-ion batteries is very low, which greatly limits their commercial promotion and application. The key issue that urgently needs to be broken through is to develop new solid-state electrolyte materials with high electrical conductivity and excellent processability. Current inorganic ceramic / glass electrolytes such as Li 5 La 3 Zr 2 o 12 , Li 3x La 2 / 3-x TiO 3 , and sulfide electrolytes are known for their high Li-ion conductivity (10 -4 ~10 -2 S cm -1 ) has received extensive atten...

AI Technical Summary

Problems solved by technology

Current inorganic ceramic / glass electrolytes such as Li 5 La 3 Zr 2 o 12 , Li 3x La 2 / 3-x TiO 3 , and sulfide electrolytes are known for their high Li-ion conductivity (10 -4 ~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 other is organic electrolytes, such as PEO, PVDF, etc. This type of 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 ~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

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