Three-dimensional lithium battery preparation method based on direct writing forming 3D printing technology
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A technology of direct writing molding and 3D printing, which is applied in the manufacture of lithium batteries, electrolyte batteries, secondary batteries, etc. It can solve the problems of large-scale and batch manufacturing, industrialization restrictions, and high costs.
Active Publication Date: 2021-01-05
XI AN JIAOTONG UNIV
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Embodiment 1
[0044] Preparation of positive and negative electrode inks and gel electrolyte inks for lithium batteries
[0045] Positive electrode ink: Weigh LiMn2O4, sodium carboxymethylcellulose, carbon black, deionized water and 1,4-dioxane respectively according to the mass percentage of 30:7:8:20:35, fully mechanically stir, and prepare a Positive ink with shear thinning rheology;
[0046] Negative electrode ink: Weigh Li4Ti5O12, sodium carboxymethylcellulose, carbon black, deionized water and 1,4-dioxane respectively according to the mass percentage of 30:7:8:20:35, fully mechanically stir, and prepare to have Negative ink with shear thinning rheology;
[0047] Gel electrolyte ink: mix 10 μm boron nitride particles with polyvinylidene fluoride-hexafluoropropylene, dimethylformamide and 1,4 dioxane in a mass ratio of 6:1:1.5:1, and Sufficient mechanical agitation configures the electrolyte ink with shear-thinning rheology.
[0048] Print Gel Electrolyte Blocks
[0049] Use the 3D ...
Embodiment 2
[0059] Preparation of positive and negative electrode inks and gel electrolyte inks for lithium batteries
[0060] Positive electrode ink: Weigh LiCoMnO4, polyvinyl alcohol, carbon black, deionized water and 1,4 dioxane respectively according to the mass percentage of 35:3:2:35:25, fully mechanically stir, and prepare to have a shear strain Positive ink with dilute rheology;
[0061] Negative electrode ink: Weigh Nb2O5, polyvinyl alcohol, carbon black, deionized water and 1,4 dioxane respectively according to the mass percentage of 35:3:2:35:25, fully mechanically stir, and prepare to have a shear deformation Negative ink with dilute rheology;
[0062] Gel electrolyte ink: mix 10μm boron nitride particles with polyvinylidene fluoride-hexafluoropropylene, dimethylformamide and 1,4 dioxane at a mass ratio of 5:1:1:1, and configure into electrolyte inks with shear-thinning rheology.
[0063] Print Gel Electrolyte Blocks
[0064] Use the 3D printing layering software Simplify3...
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Abstract
The invention discloses a three-dimensional lithium battery preparation method based on a direct writing forming 3D printing technology. The three-dimensional lithium battery preparation method comprises the following steps: step 1, designing an electrolyte block and introducing the electrolyte block into a direct writing forming machine; 2, preparing gel electrolyte ink, and supplying the gel electrolyte ink to a charging barrel of a direct writing forming machine; 3, extruding the electrolyte ink in the charging barrel under pressure; 4, controlling a printing head to move on a working platform by a program according to the current section data to form a section; 5, completing the front section, and lowering the working platform by a layered thickness; 6, repeating the third step to thefifth step, and completing the printing of the electrolyte block; 7, performing laser drilling on the electrolyte block to obtain an electrode reserved through hole; 8, preparing positive electrode ink and negative electrode ink, and respectively pouring the positive electrode ink and the negative electrode ink into the reserved through holes to obtain a battery prefabricated body; 9, removing moisture through vacuum freeze drying; 10, carrying out heat treatment on the battery prefabricated body to realize solidification of the electrode and the electrolyte block; and 11, packaging to complete the preparation of the three-dimensional lithium battery.
Description
technical field [0001] The invention belongs to the field of rapid prototyping, and in particular relates to a method for preparing a three-dimensional lithium battery based on direct-writing 3D printing technology. Background technique [0002] Lithium batteries have the advantages of high specific energy, no memory effect, low self-discharge rate and long cycle life, and are widely used in consumer electronics and portable devices. Today, researchers have done a lot of research on battery design, electrolyte and additives, and the preparation process of positive and negative electrode materials. With the rapid development of micro-electromechanical systems and electric vehicles, higher requirements are placed on the performance of lithium batteries. How to achieve both energy density and power density, that is, how to improve energy storage capacity and efficiency at the same time is an urgent need in this field. A big problem to solve. With the deepening of research, re...
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