3D printing method of lithium battery

Abstract

The invention relates to a 3D printing method of a lithium battery. The method comprises the following steps: firstly, positive and negative slurry and diaphragm slurry required for 3D printing are prepared; secondly, each slurry is respectively printed into positive and negative electrodes of a lithium battery and an electrode diaphragm layer positioned between the positive and negative electrodes; thirdly, under the protection of argon in a test-tube furnace, heat treatment is carried out to prepare an annular electrode composite material assembled by overlapping the positive electrode, the diaphragm layer and the negative electrode; and finally, the annular electrode composite material is transferred into a glove box for packaging so as to obtain an annular lithium ion battery formed by successively overlapping the cathode, the diaphragm and the anode. The preparation method is novel, and the technology is simple, accurate and controllable. The prepared material has a special structure formed by successively overlapping the cathode, the diaphragm and the anode and has large specific surface area. Each cathode, diaphragm and anode annular material itself forms a miniature lithium ion battery. Diffusion distance of lithium ion in the material is shortened greatly, and corresponding diffusion velocity is improved. The lithium ion battery has high ionic and electronic conductivity.

Description

technical field [0001] The invention relates to a 3D printing method of a lithium battery, belonging to the field of nanometer energy storage materials. Background technique [0002] With the depletion of traditional energy sources, lithium-ion secondary batteries have received extensive attention as a representative of new energy sources. At the same time, as the main power source of mobile communication equipment and portable electronic equipment, lithium-ion battery has become a research hotspot at home and abroad because of its advantages such as high output voltage, no memory, and high energy density. However, traditional Li-ion batteries based on planar electrodes generally have problems such as low specific surface area, limited energy storage density, and severe electrode polarization. [0003] In recent years, with the rise of nanotechnology and 3D printing technology, nanotechnology and 3D printing technology have been expanded to military, electronics, medicine, ...

AI Technical Summary

Problems solved by technology

[0004] However, the existing lithium-ion batteries prepared based on 3D printing technology generally adopt a cathode-anode interdigitated structure. Although this structure is easy to realize 3D printing, due to the significant volume change and large stress of lithium-ion battery electrode materials during lithium storage , this kind of interdigitated electrode is easy to deform or even collapse during the charging and discharging process, resulting in short circuit, open circuit or electrocution of the cathode and anode, which will eventually lead to poor cycle performance and fast decay of lithium storage capacity.

Lithium-ion batteries with other structures based on 3D printing technology still have many problems such as the isolation of positive and negative electrode materials and the selection of printing methods.

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