Preparation method of solid electrolyte membrane for arc brain-computer interface battery

Abstract

The invention discloses a preparation method of a solid electrolyte membrane for an arc brain-computer interface battery, and belongs to the field of battery solid electrolytes, and the preparation process comprises six steps of raw material preparation, slurry preparation, tape casting, arc pre-forming, hot-press shaping and post-treatment. Li7La3Zr2O12 powder, polyethylene oxide, LiTFSI, propylene carbonate and absolute ethyl alcohol are adopted as raw materials, and a finished product is prepared through pretreatment, ball milling, curtain coating, arc drying, hot pressing and finishing testing. The prepared solid electrolyte membrane has no liquid leakage risk and is high in safety; a brain bone groove structure is adapted through an arc-shaped pre-forming process; the oxide and the polymer synergistically improve the ionic conductivity and the energy density; no strong magnetic resonance component exists, and the electromagnetic compatibility is good. According to the two provided embodiments, flexibility and high energy density are emphasized respectively, different brain-computer interface scene requirements can be met, and a guarantee is provided for stable operation of implantable brain-computer interface equipment.

Description

Technical Field

[0001] This invention relates to the field of solid electrolyte technology for batteries, and more particularly to a method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery. Background Technology

[0002] Brain-computer interface (BCI) technology is a cutting-edge interdisciplinary field combining biomedicine and electronic engineering. Its implantable devices require batteries for power. Because the battery is implanted in the human brain, extremely high safety requirements are placed on the battery. Traditional liquid electrolyte batteries have the risk of leakage, which can cause serious damage to brain tissue. At the same time, BCI devices also have special requirements for the battery's energy density, shape adaptability (it needs to be arc-shaped to fit the brain's bone structure), and electromagnetic compatibility (to avoid interfering with brain MRI and other examinations or being subject to electromagnetic interference).

[0003] Solid electrolytes are an ideal choice for brain-computer interface batteries due to their characteristics of no leakage and high safety. However, existing solid electrolytes still have shortcomings in terms of arc-shaped adaptability and targeted optimization for brain-computer interface scenarios. Therefore, a method for preparing a solid electrolyte membrane suitable for arc-shaped brain-computer interface batteries is needed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a solid electrolyte membrane for a circular arc-shaped brain-computer interface battery, so as to solve the problems mentioned in the background art. The solid electrolyte membrane prepared by this method has high safety, good circular arc adaptability, and high energy density, which can meet the special requirements of brain-computer interface batteries.

[0005] Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery, comprising the following steps: S1. Raw material preparation Prepare oxide solid electrolyte powder (such as Li7La3Zr2O) according to the mass fraction ratio. 12 (LLZO) powder, 50-60 parts by weight, polymer matrix (such as polyethylene oxide (PEO), 30-40 parts by weight), lithium salt (such as LiTFSI, 5-10 parts by weight), plasticizer (such as propylene carbonate (PC), 2-5 parts by weight), and dispersant (such as anhydrous ethanol, appropriate amount).

[0006] The oxide solid electrolyte powder was pretreated by placing it in a vacuum drying oven and drying it at 120°C for 12 hours to remove the surface-adsorbed moisture.

[0007] S2, Slurry Preparation The pretreated oxide solid electrolyte powder, polymer matrix, lithium salt, and plasticizer are added to a ball mill jar, along with an appropriate amount of dispersant, and then ball milled. The ball milling speed is 300-500 r / min, and the milling time is 8-12 hours to obtain a uniform electrolyte slurry.

[0008] S3, Casting molding The prepared electrolyte slurry is poured into the hopper of the casting machine. The height of the doctor blade is adjusted to form a uniform wet film on the casting substrate (such as a polyimide substrate). The thickness of the wet film is controlled between 200-300 μm.

[0009] The wet film is initially dried in a drying oven at 60°C for 2-3 hours to allow the dispersant to evaporate.

[0010] S4, Arc-shaped preforming After the wet film has been partially dried, it is removed from the casting substrate and placed on a pre-prepared arc-shaped mold (the curvature of the mold is determined according to the installation requirements of the brain-computer interface battery).

[0011] Place the arc-shaped mold containing the wet film into a vacuum drying oven and dry it at 80°C for 8-10 hours to further solidify the wet film and initially form an arc-shaped structure.

[0012] S5, Hot pressing and shaping The pre-formed arc-shaped electrolyte membrane is removed from the mold and placed in a hot pressing device. The hot pressing temperature is 100-120℃, the pressure is 5-10MPa, and the hot pressing time is 1-2 hours, which solidifies the arc-shaped structure of the electrolyte membrane and improves its density.

[0013] S6, Post-processing After hot pressing and shaping, the electrolyte membrane is trimmed at the edges to remove burrs and irregular parts.

[0014] The modified electrolyte membrane was subjected to performance tests, including ionic conductivity testing (using AC impedance method, test temperature 37℃, simulating human body temperature environment), mechanical property testing (tensile strength and elongation at break), and safety testing (such as short circuit test, thermal shock test, etc.).

[0015] The beneficial effects of the method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to the present invention are as follows: High safety: It adopts an oxide / polymer composite solid electrolyte system, eliminating the risk of liquid electrolyte leakage. This ensures that the battery will not cause damage to brain tissue due to electrolyte leakage after implantation in the human brain, meeting the extremely high safety requirements of brain-computer interface devices.

[0016] Excellent arc-shaped adaptability: Through arc-shaped preforming and hot-pressing shaping processes, the solid electrolyte membrane can be adapted to the arc-shaped structure of the brain-computer interface battery, perfectly fitting the installation space of the brain bone groove.

[0017] High energy density: The addition of oxide solid electrolyte powder improves ionic conductivity, while the synergistic effect of polymer matrix and lithium salt ensures the energy density of the battery, resulting in a longer battery life and reducing the pain and risks to patients caused by frequent battery replacements.

[0018] Good electromagnetic compatibility: The solid electrolyte membrane does not contain any components that generate strong magnetic resonance, so it will not interfere with magnetic resonance imaging of the brain and can also avoid the impact of external electromagnetic interference on battery performance, ensuring the stable operation of brain-computer interface devices. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0020] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0021] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0022] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 Reference Figure 1 A method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery includes the following steps: Raw material preparation: Prepare 50 parts LLZO powder, 40 parts PEO, 5 parts LiTFSI, 5 parts PC, and an appropriate amount of anhydrous ethanol. Place the LLZO powder in a vacuum drying oven and dry at 120℃ for 12 hours.

[0024] Slurry preparation: Add the above raw materials to a ball mill jar, add anhydrous ethanol, and ball mill at 300 r / min for 12 hours to obtain a uniform slurry.

[0025] Casting: Pour the slurry into the casting machine hopper, adjust the scraper height to make the wet film thickness 200μm, and dry in a 60℃ drying oven for 3 hours.

[0026] Arc-shaped preforming: Place the wet film on an arc-shaped mold, put it in a vacuum drying oven, and dry at 80°C for 10 hours.

[0027] Hot pressing: The electrolyte membrane is placed in a hot pressing device and hot-pressed at 100℃ and 5MPa for 2 hours.

[0028] Post-processing: Edge trimming and performance testing were performed, with the ionic conductivity measured at 37℃ as 1.2 × 10⁻⁻. 4 The tensile strength is 15 MPa, the elongation at break is 80%, and the safety test has been passed.

[0029] In summary, this embodiment exhibits a high polymer matrix ratio, resulting in a solid electrolyte membrane with superior flexibility and elongation at break. During long-term implantation of the brain-computer interface battery, if slight displacement or deformation of brain tissue occurs, the electrolyte membrane can better adapt to these changes, preventing cracks caused by stress concentration. This embodiment is suitable for brain-computer interface scenarios requiring high electrolyte membrane flexibility and where the implantation site may have some mobility, such as some motor cortex brain-computer interface devices where the surrounding tissue may undergo slight deformation during human movement. The electrolyte membrane in this embodiment effectively addresses this situation, ensuring long-term stable battery operation.

[0030] Example 2 Reference Figure 1 A method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery includes the following steps: Raw material preparation: Prepare 60 parts of LLZO powder, 30 parts of PEO, 10 parts of LiTFSI, 2 parts of PC, and an appropriate amount of anhydrous ethanol. Place the LLZO powder in a vacuum drying oven and dry at 120℃ for 12 hours.

[0031] Slurry preparation: Add the above raw materials to a ball mill jar, add anhydrous ethanol, and ball mill at 500 r / min for 8 hours to obtain a uniform slurry.

[0032] Casting: Pour the slurry into the casting machine hopper, adjust the scraper height to make the wet film thickness 300μm, and dry in a 60℃ drying oven for 2 hours.

[0033] Arc-shaped preforming: Place the wet film on an arc-shaped mold, put it in a vacuum drying oven, and dry at 80°C for 8 hours.

[0034] Hot pressing: Place the electrolyte membrane into a hot pressing device and hot press at 120℃ and 10MPa for 1 hour.

[0035] Post-processing: Edge trimming and performance testing were performed, with the ionic conductivity measured at 37℃ as 1.8 × 10⁻⁻. 4 The tensile strength is 20 MPa, the elongation at break is 60%, and the safety test has been passed.

[0036] In summary, this embodiment features a high proportion of oxide solid electrolyte powder and lithium salt, resulting in superior ionic conductivity and tensile strength, which provides higher energy density and structural stability for the brain-computer interface battery. It is suitable for brain-computer interface scenarios requiring high battery energy density and relatively stable implantation sites, such as visual cortical brain-computer interface devices, which demand high battery endurance and minimize tissue deformation at the implantation site. The electrolyte membrane in this embodiment provides strong ion conduction capabilities while ensuring high safety, extending device lifespan and reducing the frequency of battery replacements during surgery.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery, characterized in that, Includes the following steps: S1. Raw material preparation: Prepare 50-60 parts of oxide solid electrolyte powder, 30-40 parts of polymer matrix, 5-10 parts of lithium salt, 2-5 parts of plasticizer and appropriate amount of dispersant according to the mass ratio; pretreat the oxide solid electrolyte powder by placing it in a vacuum drying oven and drying it at 120℃ for 12 hours. S2. Slurry preparation: The pretreated oxide solid electrolyte powder, polymer matrix, lithium salt and plasticizer are added to a ball mill jar, and an appropriate amount of dispersant is added. The mixture is ball milled at a speed of 300-500 r / min for 8-12 hours to obtain a uniform electrolyte slurry. S3. Casting: Pour the prepared electrolyte slurry into the hopper of the casting machine, adjust the height of the scraper of the casting machine, so that the slurry forms a wet film with a thickness of 200-300μm on the casting substrate; perform preliminary drying on the wet film, and dry it in a drying oven at 60℃ for 2-3 hours. S4. Arc-shaped preforming: Remove the pre-dried wet film from the casting substrate and place it on an arc-shaped mold; place the arc-shaped mold with the wet film on it into a vacuum drying oven and dry it at 80℃ for 8-10 hours. S5. Hot pressing and shaping: Remove the pre-formed electrolyte membrane from the mold and place it in a hot pressing device. Hot press for 1-2 hours at 100-120℃ and 5-10MPa. S6. Post-processing: Trim the edges of the hot-pressed electrolyte membrane and then perform performance testing.

2. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The oxide solid electrolyte powder is Li7La3Zr2O 12 Powder.

3. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The polymer matrix is ​​polyethylene oxide.

4. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The lithium salt is LiTFSI.

5. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The plasticizer is propylene carbonate.

6. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The dispersant is anhydrous ethanol.

7. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The cast base tape is a polyimide base tape.

8. The method for preparing a solid electrolyte membrane for an arc-shaped brain-computer interface battery according to claim 1, characterized in that, The performance tests include ionic conductivity testing, mechanical property testing, and safety testing; the ionic conductivity test uses the AC impedance method and the test temperature is 37℃.

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