Zinc ion battery with flexible interdigital electrode and preparation method thereof

Abstract

The invention discloses a zinc ion battery with a flexible interdigital electrode and a preparation method thereof, and belongs to the technical field of battery production. A plurality of interdigitals of the flexible interdigital positive electrode and the flexible interdigital negative electrode are alternately inserted one by one, an accommodating space is arranged between every two adjacent interdigitals, and gel electrolyte is arranged in the accommodating spaces. The method comprises the following steps: preparing flexible interdigital positive electrode slurry, flexible interdigital negative electrode slurry and gel electrolyte; placing the slurry in a needle cylinder and selecting a needle head; connecting the needle cylinder with an air pump and fixing the needle cylinder on a dispensing machine; controlling the dispensing machine to print a flexible interdigital positive electrode and a flexible interdigital negative electrode; and spraying the gel electrolyte in the accommodating space between the flexible interdigital positive electrode and the flexible interdigital negative electrode. According to the invention, the overall weight of the battery is reduced, more electric energy can be stored and released, and the application prospect of the battery in the fields of various portable devices and high energy requirements is widened. The production cost of the battery can be reduced, the production efficiency is improved, and the flexibility is high.

Description

Technical Field

[0001] The invention relates to a zinc ion battery with flexible interdigital electrodes and a preparation method thereof, belonging to the technical field of battery production. Background Art

[0002] In order for wearable electronic devices to achieve long-term stable operation, efficient and reliable energy storage devices have become indispensable key components. In this context, flexible electronic devices, as a new generation of electronic components that can adapt to complex deformation environments, have attracted extensive attention in their research and application.

[0003] Flexible electronic devices, including but not limited to integrated flexible chips, flexible solar cells, flexible energy storage batteries, artificial intelligence skin, flexible sensors and various wearable devices, all require high flexibility and deformability in materials, structures and designs to match the dynamic changes of the human body or complex surfaces. In particular, as the "heart" that supports the continuous operation of these devices, the performance of flexible energy storage batteries directly determines the overall performance and application scenarios of the devices.

[0004] Although traditional battery structures perform well in fixed application scenarios, their rigid design and stacked structure (i.e., the stacking of positive electrode, separator and negative electrode) are unable to cope with dynamic deformations such as bending and folding. Specifically, due to the different curvature radii between the positive and negative electrodes and the separator materials, they are very likely to be relatively displaced or even separated in a bent state, which will not only lead to a sharp increase in contact resistance, but also seriously hinder the transmission efficiency of electrons and ions, thereby causing a significant decrease in electrochemical performance, and cannot meet the high requirements of flexible electronic devices and wearable devices for energy storage devices.

[0005] Therefore, in order to overcome the limitations of traditional batteries in flexible applications, it is particularly urgent to develop a miniature, flexible battery that can maintain stable electrochemical properties under complex deformation environments. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention provides a zinc ion battery with flexible interdigitated electrodes and a preparation method thereof.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a zinc ion battery with flexible interdigital electrodes, comprising a flexible interdigital positive electrode, a flexible interdigital negative electrode and a gel electrolyte; the flexible interdigital positive electrode and the flexible interdigital negative electrode are both provided with a plurality of fingers, the plurality of fingers of the flexible interdigital positive electrode and the plurality of fingers of the flexible interdigital negative electrode are alternately plugged one by one and a containing space is provided between each two adjacent fingers, that is: an S-shaped containing space is provided between the flexible interdigital positive electrode and the flexible interdigital negative electrode, and a gel electrolyte is provided in the containing space.

[0008] A method for preparing a zinc ion battery with flexible interdigitated electrodes of the present invention comprises the following steps:

[0009] S1: preparing a flexible interdigitated positive electrode slurry: mixing a vanadium-based slurry and a carbon slurry in a mass ratio of 1:1-5 at high speed in a ball mill to obtain a flexible interdigitated positive electrode slurry;

[0010] S2: preparing a flexible interdigitated negative electrode slurry: mixing zinc powder and carbon slurry at a mass ratio of 1:3-8 at high speed in a ball mill to obtain a flexible interdigitated negative electrode slurry;

[0011] S3: preparing a gel electrolyte: heating and stirring an aqueous electrolyte and polyvinyl alcohol in a mass ratio of 5:0.5-1.5 to form a gel electrolyte;

[0012] The aqueous electrolyte is 2MZnSO4 or 3MZn(CF3SO3)2 or 3MZn(ClO4)2.

[0013] The heating temperature is 40-100°C.

[0014] S4: Preparation of flexible interdigitated batteries:

[0015] S401: taking the flexible interdigitated positive electrode slurry and placing it in the syringe of the dispensing machine and selecting a needle with a suitable inner diameter;

[0016] S402: Connect the syringe to the air pump and fix the syringe on the dispensing machine;

[0017] S403: using 3D printing software to control a dispensing machine to print the flexible interdigitated positive electrode slurry on a flexible substrate to form a flexible interdigitated positive electrode;

[0018] S404: Printing a flexible interdigitated negative electrode according to S401-S403;

[0019] S405: spraying the gel electrolyte into the accommodation space between the flexible interdigital positive electrode and the flexible interdigital negative electrode.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention reduces the overall weight of the battery by eliminating the carbon cloth current collector in the traditional battery. The battery structure is made more compact and the energy density of the battery is improved. Under the same volume or weight, the battery of the present invention can store and release more electric energy, thereby extending the battery life of the device, enhancing the user experience, and broadening the application prospects of the battery in various portable devices and high energy demand fields.

[0022] 2. The positive and negative electrode interdigital structure of the present invention not only simplifies the internal structure of the battery, but also eliminates the diaphragm component. As one of the key materials in the battery, the diaphragm has a relatively high cost. Therefore, the application of the present invention can significantly reduce the production cost of the battery, improve production efficiency, and enhance market competitiveness. At the same time, the adoption of the interdigital structure also provides more flexibility and possibilities for battery design, which is conducive to promoting the further development of battery technology.

[0023] 3. The finger structure of the present invention is highly flexible in design. The number of fingers can be increased or decreased according to actual needs, and the number of fingers can also exist in the form of single or multiple series or parallel connections. It can be applied to different workplaces and application scenarios to meet the energy needs of different devices. Whether it is an application scenario with high power output or a need for long battery life, the present invention can provide a tailor-made solution, greatly improving the applicability and practicality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a real photo of the present invention;

[0026] Figure 3 This is a photo of the invention with three interdigitated electrodes connected in series to power a small electronic LED lamp DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] A zinc ion battery with flexible interdigital electrodes comprises a flexible interdigital positive electrode 1, a flexible interdigital negative electrode 2 and a gel electrolyte 3; the flexible interdigital positive electrode 1 and the flexible interdigital negative electrode 2 are both provided with a plurality of interdigital fingers, the plurality of interdigital fingers of the flexible interdigital positive electrode 1 and the plurality of interdigital fingers of the flexible interdigital negative electrode 2 are alternately plugged one by one and an accommodation space is provided between each two adjacent interdigital fingers, that is, an S-shaped accommodation space is provided between the flexible interdigital positive electrode 1 and the flexible interdigital negative electrode 2, and the gel electrolyte 3 is provided in the accommodation space.

[0029] A method for preparing a zinc ion battery with flexible interdigitated electrodes of the present invention comprises the following steps:

[0030] S1: Preparation of flexible interdigitated positive electrode slurry: The vanadium-based and carbon slurries with a mass ratio of 1:1-5 (preferably 1:4) are mixed at high speed in a ball mill to obtain a flexible interdigitated positive electrode slurry; the ball mill speed is 300 rpm / min, the forward and reverse rotations are 30 minutes each, and the ball milling time is 1-6 hours, preferably 2 hours.

[0031] S2: Preparation of flexible interdigitated negative electrode slurry: Zinc powder and carbon slurry in a mass ratio of 1:3-8 (preferably 1:5) are mixed at high speed in a ball mill to obtain a flexible interdigitated negative electrode slurry; the ball mill speed is 300 rpm / min, the forward and reverse rotations are 30 minutes each, and the ball milling time is 1-6 hours, preferably 2 hours.

[0032] S3: preparing a gel electrolyte: heating and stirring an aqueous electrolyte and polyvinyl alcohol in a mass ratio of 5:0.5-1.5 to form a gel electrolyte;

[0033] The aqueous electrolyte is 2MZnSO4 or 3MZn(CF3SO3)2 or 3MZn(ClO4)2, etc., preferably 3MZn(CF3SO3)2.

[0034] The heating temperature is 40-100°C, preferably 60-80°C.

[0035] S4: Preparation of flexible interdigitated batteries:

[0036] S401: Take the flexible interdigitated positive electrode slurry and place it in the syringe of the dispensing machine and select a needle with a suitable inner diameter; the syringe capacity is 5ml or 10ml, and the selected needle specification model is 20-34G, preferably 26-32G.

[0037] S402: Connect the syringe to the air pump and fix the syringe on the dispensing machine;

[0038] S403: using 3D printing software to control a dispensing machine to print the flexible interdigitated positive electrode slurry on a flexible substrate to form a flexible interdigitated positive electrode 1;

[0039] S404: Printing a flexible interdigitated negative electrode 2 according to S401-S403;

[0040] The air pressure is 5-20psi and the printing speed is 1-5mm s -1 , the number of printing layers is 1-5 layers.

[0041] S405 : spraying the gel electrolyte 3 into the accommodation space between the flexible interdigital positive electrode 1 and the flexible interdigital negative electrode 2 .

[0042] The positive and negative electrodes are 3D printed into a forked shape, and the gel electrolyte is located in the accommodation space. The spacing between the forked fingers is very small, which reduces the transmission distance between ions and increases the ion conductivity. The number of forked pairs can be one to one hundred pairs. The number of forked electrodes includes one or more, and can be multiple in series or in parallel, and is applied to different workplaces.

[0043] Embodiment 1:

[0044] A method for preparing a zinc ion battery with flexible interdigitated electrodes of the present invention comprises the following steps:

[0045] S1: Preparation of flexible interdigitated positive electrode slurry: Add 1g of vanadium base and 4g of carbon slurry into a ball mill, add a certain amount of ball milling beads and then perform ball milling. The ball mill speed is 300rpm / min, and the forward and reverse rotations are 30min each, and the ball milling time is 2h.

[0046] S2: Preparation of flexible interdigitated negative electrode slurry: Add 1g of zinc powder and 5g of carbon slurry into a ball mill, add a certain amount of ball milling beads and then perform ball milling. The ball mill speed is 300rpm / min, and the forward and reverse rotations are 30min each, and the ball milling time is 2h.

[0047] S3: Preparation of gel electrolyte: Add 10 ml of 3MZn(CF3SO3)2 and 2 g of polyvinyl alcohol into a beaker, heat to 80°C and stir until dissolved evenly, and form a viscous gel electrolyte after natural cooling.

[0048] S4: Preparation of flexible interdigitated batteries:

[0049] S401: Take 3 ml of the flexible interdigitated positive electrode slurry and place it in a 5 ml syringe corresponding to the dispensing machine and select a needle with a needle specification of 28G;

[0050] S402: Connect the syringes to the corresponding air pumps and fix both syringes on the glue dispensing machine; place the self-laminated photo paper substrate on the printing plane of the glue dispensing machine.

[0051] S403: Set the printing path, the area of ​​the rectangle where the interdigitated electrodes are located is 1.44 cm 2 , adjust the air pressure to 10psi, and the printing speed to 2.0mm s -1 The number of printing layers is 3, and the positive electrode part is printed.

[0052] S404: Printing a flexible interdigitated negative electrode 2 according to S401-S403;

[0053] S405 : spraying the gel electrolyte 3 into the accommodation space between the flexible interdigital positive electrode 1 and the flexible interdigital negative electrode 2 .

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A zinc ion battery with flexible interdigitated electrodes, characterized in that: The invention comprises a flexible interdigitated positive electrode (1), a flexible interdigitated negative electrode (2) and a gel electrolyte (3); the flexible interdigitated positive electrode (1) and the flexible interdigitated negative electrode (2) are both provided with a plurality of interdigitated fingers, the plurality of interdigitated fingers of the flexible interdigitated positive electrode (1) and the plurality of interdigitated fingers of the flexible interdigitated negative electrode (2) are alternately plugged one by one and a containing space is provided between each two adjacent interdigitated fingers, that is, an S-shaped containing space is provided between the flexible interdigitated positive electrode (1) and the flexible interdigitated negative electrode (2), and the gel electrolyte (3) is provided in the containing space.

2. A method for preparing a zinc ion battery with flexible interdigitated electrodes according to claim 1, characterized in that: The method comprises the following steps: S1: preparing a flexible interdigitated positive electrode slurry: mixing a vanadium-based slurry and a carbon slurry in a mass ratio of 1:1-5 at high speed in a ball mill to obtain a flexible interdigitated positive electrode slurry; S2: preparing a flexible interdigitated negative electrode slurry: mixing zinc powder and carbon slurry at a mass ratio of 1:3-8 at high speed in a ball mill to obtain a flexible interdigitated negative electrode slurry; S3: preparing a gel electrolyte: heating and stirring an aqueous electrolyte and polyvinyl alcohol in a mass ratio of 5:0.5-1.5 to form a gel electrolyte; S4: Preparation of flexible interdigitated batteries: S401: taking the flexible interdigitated positive electrode slurry and placing it in the syringe of the dispensing machine and selecting a needle with a suitable inner diameter; S402: Connect the syringe to the air pump and fix the syringe on the dispensing machine; S403: using 3D printing software to control a dispensing machine to print the flexible interdigitated positive electrode slurry on a flexible substrate to form a flexible interdigitated positive electrode (1); S404: Printing a flexible interdigitated negative electrode (2) according to S401-S403; S405: spraying the gel electrolyte (3) into the accommodation space between the flexible interdigital positive electrode (1) and the flexible interdigital negative electrode (2).

3. The method according to claim 2, characterized in that: S3 The aqueous electrolyte is 2MZnSO4 or 3MZn(CF3SO3)2 or 3MZn(ClO4)2.

4. The method according to claim 2, characterized in that: The heating temperature in S3 is 40-100°C.

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