Gel electrolyte precursor and application thereof

Abstract

The invention relates to a gel electrolyte precursor and application thereof. The gel electrolyte precursor comprises a gel skeleton monomer, a flexible additive, a polymerization initiator and a lithium salt. The gel skeleton monomer comprises an acrylonitrile monomer. An elastic porous gel electrolyte can be obtained by mixing the gel electrolyte precursor with an electrolyte, and carrying out in-situ polymerization gelatinization and baking. A semi-solid battery assembled by the gel electrolyte can absorb electrolyte in the battery and reduce the existence of free electrolyte in the battery, and meanwhile, the absorbed electrolyte and the elastic porous state gel electrolyte form a new gel electrolyte, so that the electrolyte is ensured to have high conductivity, and the electrical property of the battery is ensured; and meanwhile, the use amount of the electrolyte is reduced, and an acrylonitrile polymer formed by the acrylonitrile monomer in the in-situ polymerization and gelatinization process has good flame retardant property and high voltage resistance, so that the purpose of improving the safety performance of the battery is achieved.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a gel electrolyte precursor and its application. Background technique [0002] With the rapid development and progress of society, the problem of energy shortage and environmental pollution is becoming more and more serious, people are paying more and more attention to the demand for clean energy; Lithium Ion Battery. At present, the energy density bottleneck of commercial lithium batteries has appeared, and it is difficult to improve the high energy density. As the next generation of batteries, solid-state batteries have been brought to the forefront. However, the research and development of solid-state batteries is difficult and the process requirements are relatively high. To achieve mass production, semi-solid batteries emerged as a transitional product. [0003] Spontaneous combustion of new energy vehicles is emerging one after another. People have been trying to develop sa...

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Problems solved by technology

[0005] CN105206871A discloses a method for preparing a gel electrolyte by electrochemical means, specifically using the electrode of an electrochemical device as the cathode in the electroplating pool, putting the configured electrogel solution into the electroplating pool, and A voltage is applied between the anode and the anode. After a certain period of time, the gel electrolyte will be directly deposited on the surface of the cathode to form a hydrogel membrane. The preparation process is complicated and the cost is high.

[0006] CN110224163A discloses a flexible alcohol fuel cell based on a polymer gel electrolyte membrane and a preparation method thereof, comprising the following steps: S1, adding the polymer to deionized water, stirring to form a uniform and transparent viscous solution A; S2, Add the alkaline substance into the alcohol solution, stir to form a uniform and transparent solution B; S3, add the solution B to the viscous solution A, stir to react, cool down after the reaction, and obtain the product C; S4, the product C Carry out the film coating operation to obtain a film with a preset thickness, and complete the preparation of the polymer gel electrolyte membrane; wherein, the polymer in step S1 is polyvinyl alcohol or polyacrylamide; the above gel electrolyte membrane is used in the presence of an all-solid-state battery The problem of insufficient rate performance and cycle performance

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