Solid electrolyte based on iron pillared clay and ionic liquid and preparation method thereof

Abstract

The invention discloses a solid electrolyte based on iron pillared clay and ionic liquid and a preparation method thereof. The solid electrolyte is composed of the iron pillared clay, the ionic liquidand lithium salt, and the preparation method comprises the following steps of 1) performing drying pretreatment on the lithium salt, the ionic liquid and the iron pillared clay; 2) mixing a lithium salt and an ionic liquid to obtain a lithium salt-ionic liquid mixture; 3) mixing the iron pillared clay and the lithium salt-ionic liquid mixture, and baking. According to the solid electrolyte, the iron pillared clay serves as a matrix, the ionic liquid and the lithium salt are immobilized in the iron pillared clay, and the solid electrolyte is higher in ionic conductivity and energy density, good in contact with a positive electrode and a negative electrode, higher in mechanical hardness, good in interface stability and low in raw material cost.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a solid electrolyte based on iron-pillared clay and ionic liquid and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the growth of population, the consumption of fossil energy is increasing and the reserves are rapidly decreasing. People have begun to intensify efforts to develop new and clean alternative energy sources. At the same time, it is extremely important to develop advanced energy storage technologies. Rechargeable lithium-ion batteries have the advantages of high energy density, excellent rate performance, and long cycle life, and are widely used in electric vehicles, hybrid vehicles, aerospace equipment and other fields. [0003] Most of the electrolytes used in commercial lithium-ion batteries are liquid electrolytes, which are prone to side reactions during the charging and dischar...

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Problems solved by technology

[0003] Most of the electrolytes used in commercial lithium-ion batteries are liquid electrolytes, which are prone to side reactions during charging and discharging, resulting in irreversible decline in battery capacity. At the same time, during the long-term service of the battery, the organic liquid electrolyte will volatilize, dry up, and leak. and other phenomena, affecting battery life, and there is also the problem of low safety in high temperature environments

[0004] In recent years, polymer solid electrolytes have become a research hotspot, and their safety performance has been significantly improved. However, there are disadvantages such as harsh preparation requirements, high energy requirements for equipment, low ion conductivity, high cost, and large interface resistance. The possibility of industrial application lower

[0005] Yue-Jiao Li et al. (Y.-J.Li et al. / Chinese Chemical Letters24 (2013) 70-72) used poly(ethylene oxide) polysiloxane, ion mixed solution and organically modified montmorillonite As a raw material, a polymer film solid electrolyte was prepared, and its ionic conductivity at room temperature reached 2.19×10 -3 S / cm, but the preparation success rate is low, the performance stability is poor, and the preparation process is more complicated

[0006] CN 106977753A discloses a high-strength solid electrolyte ultra-thin film. The ion conductivity at room temperature is 0.09-0.22S / cm, the mechanical strength is 180.7-287.7MPa, and the Young's modulus is 10.72-13.74GPa. The performance is excellent, but the preparation process Complex, and the water absorption rate of the film is 18.7% to 38.6%, which is greatly affected by water

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