Method for preparing lithium ion battery porous electrode based on 3D printing technology

Abstract

The invention discloses a method for preparing a lithium ion battery porous electrode based on a 3D printing technology. Lithium iron phosphate and manganese oxide are used as raw materials to prepare printing ink; by a 3D printing technology, a miniature injection print head is adopted to prepare a cathode and anode interdigital structure by using lithium iron phosphate as a cathode material and manganese oxide as an anode material; under argon protection, heat treatment is carried out to obtain an interdigital lithium ion battery structure by using porous lithium iron phosphate as a cathode material and porous manganese oxide as an anode material; and the interdigital lithium ion battery structure is transferred to a glove box for packaging so as to finally obtain the cathode and anode interdigital lithium ion battery. The preparation method is novel, and the technology is simple, accurate and controllable. The prepared material has large specific surface area, and specific capacity and energy density of the battery are greatly raised in comparison with those of a previous planar lithium ion battery. In addition, diffusion velocity of the lithium ion battery is improved by the porous structure of the cathode and anode materials, and the lithium ion battery is endowed with high ionic and electronic conductivity.

Description

technical field

[0001] The invention belongs to the field of new energy nanomaterials, and in particular relates to a method for preparing porous electrodes of lithium-ion batteries based on 3D printing technology. Background technique

[0002] With the depletion of traditional energy sources, lithium-ion batteries, as a representative of new energy sources, have gradually become a research hotspot in contemporary society, and occupy a dominant position in portable electronic devices. As the core of lithium-ion batteries, electrode materials Plays a vital role in the charging and discharging process. However, the preparation process of lithium-ion batteries based on planar electrodes requires high equipment and complicated processes; and the cycle performance and energy density of traditional planar lithium-ion batteries are limited. Moreover, with the advancement of science and technology and the gradual improvement of people's requirements for high-energy-density batterie...

Examples

Embodiment 1

[0030] (1) Weigh 2g lithium iron phosphate and ultrasonically dissolve it into 80ml deionized water and 10ml ethylene glycol; weigh 2g manganese oxide and ultrasonically dissolve it into the first mixed solution g PMMA (polymethyl methacrylate), 80ml deionized water And in the mixed solution of 30ml ethylene glycol;

[0031] (2) Transfer the above two solutions to a ball mill for 12 hours, then transfer to a centrifuge, process at 3500rmp for 2 minutes, filter to remove large particles, and then transfer the filtrate to a centrifuge for 1 hour at 3000rmp filter;

[0032] (3) Disperse the lithium iron phosphate and manganese oxide obtained after the above filtration into a mixed solution composed of glycerol, HPC, HEC and deionized water and stir vigorously for 1 hour. The glycerol, HPC, HEC and deionized water used The mass fractions of ionized water are 50-65%, 15-20%, 1-5% and 20-30% respectively;

[0033] (4) Take a glass sheet with a specification of 20×10mm as t...

Embodiment 2

[0039] (1) Weigh 3g lithium iron phosphate and ultrasonically dissolve it into 90ml deionized water and 20ml ethylene glycol; weigh 3g manganese oxide and ultrasonically dissolve it into the second mixed solution g PMMA (polymethyl methacrylate), 100ml deionized water And in the mixed solution of 40ml ethylene glycol;

[0040] (2) Transfer the above two solutions to a ball mill for 16 hours, then transfer to a centrifuge, process at 4000rmp for 3 minutes, filter to remove large particles, and then transfer the filtrate to a centrifuge for 2 hours at 3500rmp filter;

[0041] (3) Disperse the lithium iron phosphate and manganese oxide obtained after the above filtration into a mixed solution composed of glycerol, HPC, HEC and deionized water and stir vigorously for 2 hours. The glycerol, HPC, HEC and deionized water used The mass fractions of ionized water are 50-65%, 15-20%, 1-5% and 20-30% respectively;

[0042] (4) Take a glass sheet with a specification of 20×10mm ...

Embodiment 3

[0048] (1) Weigh 4g of lithium iron phosphate and ultrasonically dissolve it into 100ml of deionized water and 30ml of ethylene glycol; In the mixed solution of ethylene glycol;

[0049] (2) Transfer the above two solutions to a ball mill for 18 hours, then transfer to a centrifuge, process at 4000rmp for 4 minutes, filter to remove large particles, and then transfer the filtrate to a centrifuge for 3 hours at 4000rmp filter;

[0050] (3) Disperse the lithium iron phosphate and manganese oxide obtained after the above filtration into a mixed solution composed of glycerol, HPC, HEC and deionized water and stir vigorously for 3 hours. The glycerol, HPC, HEC and deionized water used The mass fractions of ionized water are 50-65%, 15-20%, 1-5% and 20-30% respectively;

[0051] (4) Take a glass sheet with a specification of 20×10mm as the substrate, and use the mask plate to cover the evaporation coating technology to prepare patterned gold electrodes on the surface of th...

technical field

[0001] The invention belongs to the field of new energy nanomaterials, and in particular relates to a method for preparing porous electrodes of lithium-ion batteries based on 3D printing technology. Background technique

[0002] With the depletion of traditional energy sources, lithium-ion batteries, as a representative of new energy sources, have gradually become a research hotspot in contemporary society, and occupy a dominant position in portable electronic devices. As the core of lithium-ion batteries, electrode materials Plays a vital role in the charging and discharging process. However, the preparation process of lithium-ion batteries based on planar electrodes requires high equipment and complicated processes; and the cycle performance and energy density of traditional planar lithium-ion batteries are limited. Moreover, with the advancement of science and technology and the gradual improvement of people's requirements for high-energy-density batterie...

Examples

Embodiment 1

[0030] (1) Weigh 2g lithium iron phosphate and ultrasonically dissolve it into 80ml deionized water and 10ml ethylene glycol; weigh 2g manganese oxide and ultrasonically dissolve it into the first mixed solution g PMMA (polymethyl methacrylate), 80ml deionized water And in the mixed solution of 30ml ethylene glycol;

[0031] (2) Transfer the above two solutions to a ball mill for 12 hours, then transfer to a centrifuge, process at 3500rmp for 2 minutes, filter to remove large particles, and then transfer the filtrate to a centrifuge for 1 hour at 3000rmp filter;

[0032] (3) Disperse the lithium iron phosphate and manganese oxide obtained after the above filtration into a mixed solution composed of glycerol, HPC, HEC and deionized water and stir vigorously for 1 hour. The glycerol, HPC, HEC and deionized water used The mass fractions of ionized water are 50-65%, 15-20%, 1-5% and 20-30% respectively;

[0033] (4) Take a glass sheet with a specification of 20×10mm as t...

Embodiment 2

[0039] (1) Weigh 3g lithium iron phosphate and ultrasonically dissolve it into 90ml deionized water and 20ml ethylene glycol; weigh 3g manganese oxide and ultrasonically dissolve it into the second mixed solution g PMMA (polymethyl methacrylate), 100ml deionized water And in the mixed solution of 40ml ethylene glycol;

[0040] (2) Transfer the above two solutions to a ball mill for 16 hours, then transfer to a centrifuge, process at 4000rmp for 3 minutes, filter to remove large particles, and then transfer the filtrate to a centrifuge for 2 hours at 3500rmp filter;

[0041] (3) Disperse the lithium iron phosphate and manganese oxide obtained after the above filtration into a mixed solution composed of glycerol, HPC, HEC and deionized water and stir vigorously for 2 hours. The glycerol, HPC, HEC and deionized water used The mass fractions of ionized water are 50-65%, 15-20%, 1-5% and 20-30% respectively;

[0042] (4) Take a glass sheet with a specification of 20×10mm ...

Embodiment 3

[0048] (1) Weigh 4g of lithium iron phosphate and ultrasonically dissolve it into 100ml of deionized water and 30ml of ethylene glycol; In the mixed solution of ethylene glycol;

[0049] (2) Transfer the above two solutions to a ball mill for 18 hours, then transfer to a centrifuge, process at 4000rmp for 4 minutes, filter to remove large particles, and then transfer the filtrate to a centrifuge for 3 hours at 4000rmp filter;

[0050] (3) Disperse the lithium iron phosphate and manganese oxide obtained after the above filtration into a mixed solution composed of glycerol, HPC, HEC and deionized water and stir vigorously for 3 hours. The glycerol, HPC, HEC and deionized water used The mass fractions of ionized water are 50-65%, 15-20%, 1-5% and 20-30% respectively;

[0051] (4) Take a glass sheet with a specification of 20×10mm as the substrate, and use the mask plate to cover the evaporation coating technology to prepare patterned gold electrodes on the surface of th...

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