An all-solid continuous fiber lithium-ion battery structure and its 3D printing forming method

Abstract

An all-solid-state continuous fiber lithium-ion battery structure and its 3D printing forming method. The concentric multi-layer composite single-bundle lithium-ion battery is formed by 3D printing. The innermost layer of the concentric multi-layer composite single-bundle lithium-ion battery is a metal wire and a continuous fiber. Composite negative electrode composed of fibers, the outer surface of the composite negative electrode is an insulating solid electrolyte layer, the outer surface of the solid electrolyte layer is a conductive positive electrode, and the outer surface of the positive electrode is a viscous insulating packaging layer; the 3D printing method is to prepare metal wire and continuous fiber first. The composite single-bundle is corroded and dried, and then the positive electrode gel is wrapped to prepare a concentric multi-layer composite single-bundle lithium-ion battery. According to the printing method of continuous fiber composite materials, a lithium-ion battery of the desired shape is obtained; in the concentric composite single-bundle lithium-ion battery The negative electrode and the positive electrode of the ion battery are distributed to lead out a wire to obtain an all-solid continuous carbon fiber lithium ion battery; the invention has low cost and high efficiency, and can manufacture composite material parts with complex shapes.

Description

technical field [0001] The invention relates to the technical field of 3D printing of lithium ion batteries, in particular to an all-solid-state continuous fiber lithium ion battery structure and a 3D printing forming method thereof. Background technique [0002] Rechargeable and dischargeable lithium-ion batteries have the advantages of high voltage, long service life, large specific energy, small self-discharge, and good safety performance. Broad application prospects. The shape and size of the battery directly determine the shape and volume of the electronic device. However, the shape of the traditional lithium-ion battery is relatively fixed, and the volume and weight of the electronic device are relatively high. Therefore, in order to achieve the development requirements of the largest capacity, smallest volume, and lightest weight of lithium-ion batteries, it is necessary to rapidly design and manufacture lithium-ion batteries of any shape. In addition, traditional l...

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Problems solved by technology

[0004] 1) At the present stage, 3D printed lithium-ion batteries usually have poor mechanical properties, can not play a load-bearing role, and it is difficult to achieve structural and functional integration. However, with better mechanical properties, due to the high content of binder, the specific capacity of the battery is relatively low. low, therefore, these techniques are difficult to apply directly

[0005] 2) The existing 3D printing lithium-ion battery technology still adopts the sandwich structure of the traditional lithium-ion battery collector-electrode-electrolyte / diaphragm-electrode-collector, and has not optimized the structure of the lithium-ion battery. Therefore, it is not fully Give full play to the advantages of 3D printing in structural molding

[0006] 3) Existing 3D printing lithium-ion batteries use negative electrode materials such as lithium titanate (theoretical capacity 175mAh / g) and graphite with low specific capacity, while metallic lithium with high theoretical capacity cannot be used in the air environment , so it is necessary to use a negative electrode material that has a high theoretical capacity, can be used stably in an air environment, and can be printed

[0007] The existing 3D printing method (Chinese patent CN108048763A, a metal matrix composite material 3D printing method based on continuous fiber surface modification) refers to fully wetting the flowing substrate and base material inside a specific nozzle, and Under the action of traction, the coil is drawn from the nozzle for further processing, or deposited on the bottom layer to accumulate parts of the desired shape; however, it does not propose a reasonable solution for functional structures such as lithium-ion batteries and Process improvements are made, therefore, a separate study is required

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