Electrode assembly, lithium-oxygen thin film battery and preparation method

Abstract

The invention relates to an electrode assembly, a lithium-oxygen thin-film battery and a preparation method thereof. The electrode assembly comprises an insulating substrate, a positive electrode filmlayer, a negative electrode film layer and a protective layer. The positive electrode film layer and the negative electrode film layer are located on the same surface of the insulating substrate, a space is between the positive electrode film layer and the negative electrode film layer, and the protective layer is located on the upper surface of the negative electrode film layer. The electrode assembly has a simple structure, provides a reliable platform for in-situ characterization, and has the advantages of large size adjustable range, high material utilization, and simple and rapid preparation method. The lithium-oxide thin-film battery prepared from the electrode assembly facilitates integrated design and battery portable processing.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to an electrode assembly, a lithium-oxygen thin film battery and a preparation method. Background technique [0002] With the promotion and rapid development of electric vehicles, new requirements are put forward for the performance of mobile chemical power sources. Not only higher energy density is required to provide long-lasting power, but also higher power density is required to meet the high power demand during fast start and acceleration, and climbing. Therefore, new chemical power sources with high energy density and high power density have become research hotspots worldwide. Lithium-oxygen batteries have attracted widespread attention due to their ultra-high theoretical energy density, and are expected to become the mainstream trend of batteries in the future. However, the actual energy density, charge-discharge efficiency, and cycle life of existing lithium-oxyge...

AI Technical Summary

Problems solved by technology

[0004] 1. The preparation of the positive electrode sheet and the battery assembly process are complex, time-consuming and costly;

[0005] 2. The size of the battery is large, and more materials are required to study the performance of the battery, such as electrodes, electrolytes, current collectors, etc. The research cost is high, and due to structural limitations, it is difficult to reduce the size;

[0006] 3. Since the interface reaction mechanism of lithium-oxygen batteries needs to be further studied and elucidated, the in-situ characterization method is the most commonly used and the most effective method for studying the interface reaction mechanism. Battery materials such as electrodes, electrolytes, etc. need to be disassembled or even destroyed when performing characterization such as SEM, STEM, XRD, etc., and it is impossible to perform in-situ characterization. It is difficult to quickly and effectively study the interface reaction mechanism and battery materials of lithium-oxygen batteries. Changes during charging and discharging;

[0007] 4. The preparation of the positive electrode sheet is generally to mix the active material, binder, conductive agent, etc. and then apply it to the current collector. First, the binder, conductive agent, and current collector may affect the performance of the battery, so it is difficult to study the positive electrode alone The impact of active materials or electrolytes on battery performance, and the second is that the shape of the positive electrode sheet, the loading of active materials, etc. are difficult to control, which increases battery variables. Both of the above two aspects increase the difficulty of screening electrode materials and electrolytes

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