A kind of solid electrolyte that can be used for lithium metal battery and preparation method thereof

Abstract

The invention belongs to the technical field of electrolytes, and discloses a solid-like electrolyte for a lithium metal battery and a preparation method of the solid-like electrolyte, and the solid-like electrolyte is a solid-liquid blend electrolyte prepared by fully mixing and mechanically grinding raw materials including a functionalized covalent triazine framework and an ionic liquid containing a lithium salt. According to the invention, key compositions and microstructures (such as core compositions, chemical structures and the like of solid framework materials and the like) of the solid-like electrolyte are used, the overall process design of the corresponding preparation method and the conditions and parameters (such as the variety and proportion of reaction raw materials, reactiontemperature and time) of each step are improved; the obtained solid-liquid blend electrolyte material not only has high strength of a solid electrolyte and can effectively inhibit growth of lithium dendrites, but also has very high liquid content and can improve ion conduction and interface stability, so that relatively high lithium metal battery performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and more specifically relates to a quasi-solid-state electrolyte applicable to lithium metal batteries and a preparation method thereof. Background technique [0002] With the continuous reduction of fossil resources and the rapid expansion of the electronic market, human demand for secondary lithium batteries is also growing rapidly. Due to its ultra-high theoretical specific capacity (3860mAh g -1 ), lowest negative electrochemical potential (-3.04 V compared to standard hydrogen electrode), and abundant in nature are considered to be one of the most electrochemical storage and energy storage systems. However, due to the uneven deposition and growth of lithium dendrites during repeated charge and discharge, the cycle performance of the battery will be reduced, and even lead to dangerous accidents such as short circuit and explosion. [0003] In order to improve the safety of lithium meta...

AI Technical Summary

Problems solved by technology

In order to improve the conductivity of the electrolyte, Croce, F. and Yang, J. et al [J.Power Sources 2011,196(18),7681-7686 and Journal of Applied Electrochemistry 2004,34(4),403-408.] in Inorganic fillers (SiO 2 and ZrO 2 ) to improve the ionic conductivity of solid-state electrolytes, but the uneven dispersion of fillers will significantly reduce the cycle stability of lithium metal batteries

In addition, solid polymer electrolytes and inorganic solid electrolytes have the disadvantage of large interface impedance, which cannot meet the requirements of fast charging and fast discharging of lithium metal batteries.

Gel electrolyte combines the dual advantages of solid electrolyte and liquid electrolyte, its higher strength can effectively inhibit the growth of lithium dendrites, and its higher liquid content can obtain higher ionic conductivity and better interface stability , but gel electrolytes are usually obtained by photopolymerization or thermal polymerization, in which unreacted and residual small molecules will react with lithium metal to seriously reduce the cycle stability of the battery

Images