Single-ion gel polymer electrolyte and preparation method thereof

Abstract

The invention relates to single-ion gel polymer electrolyte and a preparation method thereof. The preparation method is characterized by comprising the following steps: firstly, selecting double-bond sulfonate and preparing double-bond lithium sulfonate by utilizing the characteristic that sodium sulfate is not dissolved into absolute ethyl alcohol; preparing the double-bond lithium sulfonate into a single-ion gel polymer base body, wherein the mol ratio of an added monomer to a carbon-carbon double bond in the lithium sulfonate ranges from (10 to 1) to (1 to 10), a catalyst is 2,2'-azobis(2-methylpropionitrile) with the concentration of 2wt%, and a solvent is toluene; reacting at 70 DEG C-80 DEG C for 7h-12h; and taking the prepared polymer as a base body and preparing the single-ion gel polymer electrolyte, wherein the adding amounts of the polymer and the organic solvent, and liquid electrolyte are 1g-3g and 20ml-50ml respectively. The single-ion gel polymer electrolyte has the beneficial effects that the transport number of lithium ions of the electrolyte is improved through introducing the lithium ions into the polymer in a chemical bond connecting manner, so that the possibility is provided for further improving the energy density of a lithium-ion battery, and a certain foundation is laid for application of the gel polymer electrolyte in actual production.

Description

technical field [0001] The invention relates to a single-ion gel polymer electrolyte and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] At present, lithium-ion batteries have made great progress and have been widely used in digital products, electric tools, vehicles, lighting and other fields. However, lithium-ion batteries still have the disadvantage of low endurance due to low energy density. The lithium ion migration number of the electrolyte used in lithium-ion batteries is one of the key factors determining the energy of the battery. In order to increase the lithium ion migration number in the electrolyte, the most commonly used method is to increase the volume of the anion of the lithium salt added to the electrolyte, such as introducing an organic large anion group lithium salt. This method has indeed achieved some effects to a certain extent. However, these lithium salts with large organic grou...

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