Preparation method of all-solid polymer electrolyte through in-situ ring opening polymerization of epoxy compound, and application of the all-solid polymer electrolyte in all-solid lithium battery

Abstract

The invention discloses a preparation method of an all-solid polymer electrolyte through in-situ ring opening polymerization of an epoxy compound, and an application of the all-solid polymer electrolyte in an all-solid battery. The preparation method is characterized in that a liquid-state epoxy compound, a lithium salt, a battery additive and the like are employed as precursors and are injected into between a positive pole sheet and a negative pole sheet of the battery, and under a heating condition, in-situ polymerization solidification is carried out to form the all-solid polymer electrolyte, and furthermore, the all-solid battery is produced. The ionic conductivity at room temperature of the all-solid polymer electrolyte can reach from 1*10<-5> S / cm to 9*10<-3> S / cm and electric potential window is 3.5-5 V. The all-solid polymer electrolyte is prepared through the in-situ copolymerization method, so that the all-solid polymer electrolyte has excellent contact with electrodes, thereby greatly improving interface compatibility of the solid-state battery, reducing interface wetting and modification steps of the solid-state battery, reducing production cost of the solid-state battery and improving performances of the solid-state battery. The invention also discloses an all-solid polymer lithium battery assembled from the all-solid polymer electrolyte.

Description

technical field [0001] The invention relates to the field of solid polymer electrolytes and solid polymer lithium batteries, and provides a method for preparing an all-solid polymer electrolyte by in-situ ring-opening polymerization of epoxy compounds; A preparation method for preparing an all-solid-state polymer lithium battery by ring-opening polymerization. Background technique [0002] Due to the safety problems of lithium-ion batteries such as leakage, fire, and explosion caused by traditional liquid electrolytes, the development and application of high-energy lithium-ion batteries have been seriously hindered. All-solid-state lithium batteries have good safety performance, so the research on solid-state lithium batteries has received widespread attention. Solid-state batteries generally include two categories, the first category is inorganic solid-state lithium batteries, and the second category is solid-state polymer lithium batteries. The solid polymer electrolytes...

AI Technical Summary

Problems solved by technology

All of these solid polymer electrolytes are prepared by pre-preparing polymer films and then assembled into batteries by winding or stacking the positive and negative electrodes of the battery, which leads to a gap between the battery poles / solid electrolyte The solid / solid interface impedance is very large, and the charge and discharge performance, rate and cycle performance of solid-state batteries are relatively poor

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