Flexible all-solid-state polymer lithium battery and preparation method thereof

Abstract

The invention relates to a flexible all-solid-state polymer lithium ion battery and a preparation method thereof, belonging to the field of flexible all-solid-state batteries. The flexible all-solid-state polymer lithium battery of the present invention includes a flexible positive electrode layer, a solid electrolyte layer, a flexible negative electrode layer and a packaging film, and the stacking sequence is packaging film-flexible positive electrode layer-solid electrolyte layer-flexible negative electrode layer-packaging film; The solid electrolyte layer is an ordered multilayer solid electrolyte fiber composed of inorganic ceramic fillers, lithium salts, and polymer polymers, wherein the lithium salt is contained in the fibers, and the inorganic ceramic fillers are embedded in the fibers or attached to the surface of the fibers. The all-solid flexible polymer lithium battery of the present invention has a simple preparation process, has a good specific capacity, can be charged and discharged normally in a bent and twisted state, has no obvious change in capacity, and exhibits good mechanical properties and stable electrochemical properties. In addition, it also has the advantages of high conductivity, strong conduction ability, and low impedance at the interface.

Description

technical field [0001] The invention relates to a flexible all-solid-state polymer lithium ion battery and a preparation method thereof, belonging to the field of flexible all-solid-state batteries. Background technique [0002] With the continuous advancement of technology and the continuous growth of people's needs, new flexible electronic devices have gradually become a rising star of digital products, and more and more new flexible electronic devices such as roll-up displays, smart watches, wearable power sensors, etc. are springing up. appear in people's daily life. As a key component of new flexible electronic devices, flexible batteries need to be able to charge and discharge stably in the process of external bending and twisting, and have no strict requirements on the installation space, which requires the battery to have flexible and ultra-thin structural characteristics. [0003] Furthermore, traditional lithium-ion batteries are generally based on liquid organic ...

AI Technical Summary

Problems solved by technology

Polymer materials are simple to prepare, have good safety performance, and have high lithium ion migration numbers, but their electrical conductivity is generally low and their thermal stability is not good. Later, researchers discovered that introducing inorganic particles into traditional polymer electrolysis can simultaneously increase the ion density of the electrolyte. Electrical conductivity and mechanical strength, is a good modification method

However, traditional inorganic polymer electrolytes are mainly formed by in-situ or ex-situ mixing of polymers and inorganic particles. High interface impedance

[0005] In addition, the interface problems of all-solid-state lithium batteries, especially the relatively large interface impedance at the interface between the positive electrode and the electrolyte, have affected the further development and application of flexible all-solid-state polymer lithium batteries to a certain extent.

[0006] CN106784988A discloses a flexible all-solid-state thin-film lithium battery and its production method, but it is an all-solid-state thin-film battery with a very small capacity, and is currently only suitable for powering microelectronics, and cannot drive commonly used small and medium-sized electronic devices such as mobile phones and watches; In addition, its preparation process equipment is very complicated, and magnetron sputtering equipment is also required; and the flexibility of its products is not ideal

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