Electrolyte for polyoxometallate ionic liquid lithium ion battery and preparation method of electrolyte

Abstract

The invention discloses electrolyte for a polyoxometallate ionic liquid lithium ion battery. The electrolyte comprises the following raw materials: ionic liquid and lithium polyoxometallate, wherein the ionic liquid is synthesized from imidazolium cations and polyoxometallate anions; the structural formula of the imidazolium cations is shown in the specification, wherein each of R1 and R2 is one of alkyl groups with 1-6 carbon atoms; the polyoxometallate anions refer to [XY12O40]<3-> or [XY12O40]<4->, wherein X is any one of two elements P and Si, and Y is any one of two elements Mo and W. Since the lithium polyoxometallate Li3XY12O40 is in a three-dimensional skeleton structure, lithium ions can be conducted in a three-dimensional skeleton, and the polarity caused by the ion transport problem of the battery is reduced; since the lithium polyoxometallate does not contain fluorine, the moisture problem and the safety problem caused by fluorine are avoided.

Description

Technical field [0001] The present invention involves an electrolyte for lithium battery, especially for a polyshed oxide ion liquid lithium lithium ion battery for electrolytic solution, which is the field of ionic liquid electrolyte technology. Background technique [0002] With the intensification of environmental pollution, the demand for green chemical power supply in various countries is increasing. As a representative of the green chemical power supply, lithium batteries have the advantages of high energy density, long service life, and low self -discharge rate.Applications.Lithium batteries are composed of positive electrode materials, diaphragm, negative materials, and electrolytes. Among them, lithium battery electrolyte is the carrier of lithium ion transmission in the battery, which is generally composed of lithium salt and organic solvents.Common lithium salts include: lipf 6 , Libf 4 , Libob, etc., organic solvents include: carbonate, carbonate, carbonate, carbonate...

AI Technical Summary

Problems solved by technology

This invention provides a novel lithium-ion battery electrolyte that can be stored at high temperature and has a certain flame retardancy. The ionic liquid also has high conductivity, but the electrolyte salt in the electrolyte described in the invention is LiPF6, the salt will produce HF when encountering a trace amount of water. As we all know, HF is the key factor leading to the failure of lithium batteries; in addition to ionic liquid and electrolyte salt, there is also dimethyl carbonate in the electrolyte, Commonly used organic solvents for lithium battery electrolytes such as ethylene carbonate and ethyl methyl carbonate. Compared with ionic liquids, these solvents have a narrower temperature range and a lower ignition point. When the battery thermal runaway occurs, it is easy to burn and cause greater safety hazards. question

Images