Auto-doped gel polymer electrolyte and preparation method thereof

Abstract

The invention relates to an auto-doped gel polymer electrolyte and a preparation method thereof. The auto-doped gel polymer electrolyte is characterized by comprising the following steps: firstly, preparing an auto-doped polymer, specifically adding monomers while controlling the molar ratio of the added monomers to carbon-carbon double bonds in siloxane to be (5:1) to (1:5), reacting at 70-80 DEG C for 7-12 hours by taking 2wt.% azodiisobutyronitrile as a catalyst and methylbenzene as a solvent, acidifying with 1.5-2.0vl.% of hydrochloric acid solution for 3-5 hours, finally introducing nitrogen at 120 DEG C and processing for 24-30 hours; and secondly, preparing the auto-doped gel polymer electrolyte from the prepared polymer as a base body, wherein the adding amounts of the polymer, the organic solvent and the liquid electrolyte are respectively 3-7g, 50ml and 7-3g. The auto-doped gel polymer electrolyte has the beneficial effects that the inorganic packing is introduced to the polymer in a chemical bond connection manner, so that the problems that additionally added packing is easy to agglomerate and difficult to disperse are thoroughly overcome; novel base bodies of gel polymer electrolyte are developed; the film-forming property and the dimensional space stability of the gel polymer electrolyte are improved; and a certain foundation is laid for application of the gel polymer electrolyte in practical production.

Description

technical field [0001] The invention relates to a self-doping gel polymer electrolyte and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] At present, liquid electrolytes are commonly used in lithium-ion battery products, because this electrolyte has good ion conductivity and compatibility with electrodes, and is low in cost. However, this electrolyte has a series of problems such as leakage, explosion, and combustion. safe question. Therefore, polymer solid-state electrolytes emerged as the times require. This electrolyte completely solves the safety problem, but it has problems such as low ion conductivity and high cost. The production technology of solid polymer electrolyte lithium-ion battery products is monopolized, and only a few super-large lithium-ion battery manufacturers in the world can launch such battery products, which are expensive and are almost only used in Apple's digital products, and c...

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