Preparation method and application of high-temperature resistant solid-state polymer electrolyte

Abstract

The invention discloses a preparation method of a high-temperature resistant solid-state polymer electrolyte and application of same in a lithium battery. The preparation method of the high-temperature resistant solid-state polymer electrolyte at least comprises the steps of uniformly mixing two or more polymer monomers, a conductive salt and an initiator on a molecular level to form a precursor solution according to a certain proportion, coating the precursor solution on a surface of a substrate or an electrode, and preparing the solid-state polymer electrolyte by a polymerization method. The electrolyte is directly assembled into the battery, and the battery can work in a room temperature and a high temperature. The method has the advantages of high controllability, convenience in operation, low cost and favorable application prospect. The mechanical property and the thermal stability of the polymer electrolyte obtained according to the method are maintained very well, meanwhile, the moving ability and the ionic conductivity of a polymer chain segment are improved, and thus, a synergetic enhancement effect is achieved.

Description

[0001] Technical field: [0002] The invention relates to a class of high temperature resistant polymer electrolyte and its application in lithium batteries. [0003] Background technique: [0004] With the increasingly serious environmental pollution and the increasing scarcity of fossil fuels, it is particularly important to develop clean, cheap and safe energy storage technologies. Lithium metal batteries are known for their high theoretical energy density (3860mA hg -1 ) has received more and more attention, but lithium metal liquid batteries have electrolyte leakage, uneven deposition and dissolution of lithium metal negative electrodes to form lithium dendrites that pierce the separator, short-circuit the battery, and burn or explode due to local overheating. , thus limiting the development of lithium metal batteries. In the all-solid-state lithium metal battery, the flammable electrolyte and the loose and porous diaphragm are replaced by a solid electrolyte with a cert...

AI Technical Summary

Problems solved by technology

However, due to the regular stacking of layers of a single polymer, the polymer has good crystallinity and mechanical strength, but it largely limits the polymer's chain segment mobility and has low ionic conductivity. , so the contradiction between mechanical properties and ionic conductivity often mentioned in polymer electrolytes arises

At present, most of the work is to use this polymer with high mechanical strength as the skeleton, and add liquid electrolyte, ionic liquid, etc. to prepare gel electrolyte by casting, soaking, etc., so as to achieve a balance between ionic conductivity and mechanical properties. , however, the gel electrolyte formed by this method does not avoid the use of electrolyte, so it does not completely solve the safety problem in liquid electrolyte

When the polymer electrolyte membrane obtained by the commonly used casting film forming method is in contact with the positive electrode and the negative electrode when the battery is assembled, the contact interface between the electrode and the electrolyte often has poor contact or unstable contact, and when this type of method is cast into the film, it will volatilize. A large amount of solvent is wasted and pollutes the environment

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