Membrane electrode integrated structure and preparation method and application thereof

Abstract

The invention discloses a membrane electrode integrated structure as well as a preparation method and application thereof. Polyoxyethylene and lithium salt are dissolved in anhydrous acetonitrile, and then Li6. 4La3Zr2Al0. 2O12 nanofibers are added to prepare uniform slurry; the preparation method comprises the following steps: dissolving polyoxyethylene and a lithium salt in N-methyl pyrrolidone, and then adding an inorganic electrolyte to prepare a uniform mixed solution; mixing a binder and a catalyst, and fully grinding to obtain black ink slurry; and pouring the slurry on a polyfluortetraethylene plate, and dispensing the ink slurry on the surface of the electrolyte to obtain a membrane electrode integrated structure. The upper layer is a catalyst layer, the lower layer is a structure with solid electrolyte as a support, and a three-phase interface where O2, Li < + > and electrons interact is arranged at a middle interface. And the mixed rapid conduction of ions and electrons is realized, the problem that the interface impedance of a solid-solid interface is sharply increased after circulation is effectively improved, and the cycle performance of a solid-state lithium-oxygen battery is improved when the solid-solid composite material is applied to an all-solid-state lithium battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a membrane-electrode integrated structure, a preparation method and an application. Background technique [0002] The widespread application of portable electronic devices has increased the demand for safe and high-energy-density flexible energy storage devices. Among many battery systems, solid-state lithium batteries (SSBs) have attracted much attention. However, lithium metal suffers from severe liquid electrolyte corrosion and rough dendrite growth due to its high activity. It is found that the strategy of using composite solid electrolyte (CPE) instead of liquid electrolyte can effectively solve the above problems of Li metal anode. [0003] Current all-solid-state lithium batteries (ASSLB) are nowhere near competitive with commercial lithium-ion batteries in terms of battery performance and ease of fabrication, because traditional ASSLB assembly requires lab...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN113471408A discloses a composite positive electrode of an all-solid-state battery and a preparation method thereof to obtain a composite positive electrode of an all-solid-state battery and a solid-state battery comprising the composite positive electrode. The preparation method increases the contact area between the positive active material and the inorganic solid electrolyte, However, the electrode preparation process is relatively complicated, and it is not easy to mass-produce solid-state batteries on the basis of existing manufacturing equipment.

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