Asymmetric solid electrolyte and preparation method thereof as well as solid lithium battery and preparation method thereof

Abstract

The invention provides an asymmetric solid electrolyte and a preparation method thereof as well as a solid-state lithium battery and a preparation method thereof. The prepared asymmetric solid electrolyte has a multilayer structure of solid polymer electrolyte / inorganic solid electrolyte / gel polymer electrolyte; the middle layer is an inorganic solid electrolyte and limits the polarization behavior caused by anion transmission in the charging and discharging process; the solid polymer electrolyte which is prepared by adopting an in-situ polymerization process, has good electrochemical compatibility and physical contact performance with metal lithium and has high mechanical strength is arranged on one side in contact with the metal lithium negative electrode, so that on one hand, the high mechanical strength inhibits the generation of lithium dendrites, and meanwhile, the interface performance is improved; the gel polymer electrolyte formed based on in-situ polymerization is adopted on one side in contact with the positive electrode, the good flexibility of the gel polymer solid electrolyte plays a buffering role on mechanical stress generated by volume change to a certain extent, and the problem of interface failure caused by the mechanical stress in the circulation process is prevented.

Description

technical field [0001] The invention belongs to the technical field of energy storage devices, and in particular relates to an asymmetric solid electrolyte and a preparation method thereof, a solid lithium battery and a preparation method thereof. Background technique [0002] All-solid-state lithium batteries have the advantages of high safety, high energy density, high power density, and long cycle life, so they have become one of the next-generation energy storage systems with great development prospects. Solid electrolyte is one of the key components that determine the performance of all-solid-state lithium batteries. The solid-state electrolyte is non-flammable, has high thermal stability, and is non-volatile, bringing high safety. Second, it has good chemical / electrochemical stability. Despite the excellent properties of solid electrolytes, researchers have developed some solid electrolytes with 1×10 -3 High ionic conductivity above S / cm, but the interface problem h...

AI Technical Summary

Problems solved by technology

In recent years, researchers have also modified the interface between the electrolyte and the electrode through various technologies, which has improved the performance of solid-state lithium batteries to a certain extent. The mechanical stress brought by the volume change of the positive electrode leads to the failure of the interface contact, and the comprehensive function of inhibiting the growth of lithium dendrites leads to a large interface resistance, which makes it difficult to achieve a stable long cycle, and eventually leads to battery failure.

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