A kind of gel electrolyte precursor and its application

Abstract

The present invention relates to a gel electrolyte precursor and its application. The gel electrolyte precursor includes a gel skeleton monomer, a flexible additive, a polymerization initiator and a lithium salt; wherein, the gel skeleton monomer includes acrylonitrile It is a kind of monomer; it is mixed with the electrolyte, gelled by in-situ polymerization, and baked to obtain an elastic porous gel electrolyte; the semi-solid battery assembled from it can absorb the electrolyte in the battery and reduce the free electrolysis in the battery At the same time, the absorbed electrolyte and the elastic porous gel electrolyte form a new gel electrolyte, which ensures that the electrolyte has high conductivity and the electrical performance of the battery; at the same time, the amount of electrolyte is reduced, and The acrylonitrile polymer formed from the acrylonitrile monomer in the process of in-situ polymerization and gelation has good flame retardancy and high voltage resistance, thereby achieving the purpose of improving the safety performance of the battery.

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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