Preparation method of integrated all-solid-state lithium battery structure

Abstract

The invention discloses a preparation method of an integrated all-solid-state lithium battery structure, which is characterized by comprising the following steps: preparing a composite electrode by adopting a positive active material and a lithium aluminum titanium phosphate (LATP) solid electrolyte, and carrying out tape casting on the prepared composite electrode, lithium aluminum titanium phosphate and lithium lanthanum zirconium oxide (LLZO) by a tape casting method to prepare a film blank; the membrane blank is subjected to lamination hot pressing and co-sintering to prepare the asymmetric solid electrolyte ceramic membrane, the composite electrode layer is of a compact structure, the LATP solid electrolyte layer is of an ultrathin compact structure, and the LLZO solid electrolyte layer is of a gradient porous structure; and then lithium metal is permeated into the gradient porous LLZO solid electrolyte by a hot melting means, so that the integrated all-solid-state lithium battery is formed. According to the invention, the problem of interface impedance existing in the all-solid-state lithium battery is greatly reduced, the problem of side reaction existing between LATP and lithium metal is solved by using LLZO with various stable performances, and the purposes of prolonging the cycle life of the solid-state battery and improving the energy density of the solid-state battery are achieved.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium batteries, and in particular relates to a preparation method of an integrated all-solid-state lithium battery structure. Background technique [0002] Since the successful commercialization of lithium-ion batteries in the 1990s, portable electronic products (such as mobile phones, smart watches, notebook computers, electric vehicles, etc.) have achieved unprecedented development, bringing about tremendous changes in people's lives and production methods. . However, most of the current commercial lithium-ion batteries use liquid organic electrolytes, which have potential safety hazards such as flammability and leakage. In order to improve the safety of lithium-ion batteries and further expand their application scenarios, it is urgent to develop lithium-ion batteries with good safety, high rate performance, and long cycle life. The use of solid-state electrolytes instead of organic liq...

AI Technical Summary

Problems solved by technology

[0003] In various solid electrolytes, Li with NASICON-type structure 1+x Al x Ti 2-x (PO 4 ) 3 (LATP, 0≤x≤0.5) solid electrolyte has the advantages of high ionic conductivity, good environmental stability, and mild synthesis conditions, so it has broad development prospects and application potential; however, the existing LATP solid electrolyte ceramic membranes exist Problems such as low ionic conductivity, poor interface contact between the positive electrode and the electrolyte, lithium metal side reactions, etc.

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