Preparation method of solid electrolyte, solid electrolyte and all-solid-state battery

Abstract

The invention provides a preparation method of a solid-state electrolyte, the solid-state electrolyte and an all-solid-state battery, and the preparation method comprises the following steps: 1) dissolving 10-50 wt% of lithium salt, adding 10-30 wt% of inorganic filler, and then adding 30-80 wt% of first polymer to obtain first electrolyte slurry with the solid content of 10-40%; 2) dissolving 10-50 wt% of a lithium salt, and adding 30-80 wt% of a flexible monomer and 1-3 wt% of an initiator to obtain a second electrolyte slurry with a solid content of 10-40%; 3) pouring the first electrolyte slurry onto a multifunctional casting machine substrate, arranging a non-woven fabric on the surface, far away from the substrate, of the first electrolyte slurry, pouring the second electrolyte slurry onto the non-woven fabric, and heating the first electrolyte slurry at 60-80 DEG C to obtain the solid electrolyte. The solid electrolyte prepared by the method is tight in double-layer membrane connection and free of obvious layering, so that the solid electrolyte has good ionic conductivity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of a solid electrolyte, a solid electrolyte and an all-solid battery. Background technique [0002] With the increasing shortage of fossil energy, people began to study energy storage and conversion devices. Currently, the most convenient form of electrical energy storage is electrochemical storage, such as batteries and supercapacitors. Among them, lithium-ion batteries are the most commonly used batteries today. In recent years, lithium-ion batteries, as an important sustainable new energy source, have been widely used in 3C products, electric vehicles, large-scale energy storage, aerospace and other fields. However, most of the widely used lithium-ion batteries are organic liquid or gel polymer batteries, and the electrolyte of this type of battery is liquid, so there are often safety problems such as leakage, explosive combustion, etc., in or...

AI Technical Summary

Problems solved by technology

However, most of the widely used lithium-ion batteries are organic liquid or gel polymer batteries, and the electrolyte of this type of battery is liquid, so there are often safety problems such as leakage, explosive combustion, etc., in order to better solve this problem People began to study safer solid-state electrolytes

[0003]Polymer solid electrolyte has good processability and is not strict to the environment, but the current multi-layer composite polymer electrolyte has obvious delamination and loose contact, which leads to The ionic conductivity of the electrolyte is poor, and the interface impedance with the positive and negative electrodes is large, which makes the battery easy to polarize and increases the internal resistance of the battery, resulting in poor cycle life of the battery

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