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Method for modifying lithium battery diaphragm by temperature-resistant macromolecules and corresponding lithium battery diaphragm

A lithium battery diaphragm and polymer technology, applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problem of not being able to prevent lithium dendrites from the mechanism, no diaphragm modification technology, and lack of performance of traditional diaphragms, etc. problem, to achieve the effect of preventing internal short circuit of the battery, uniform distribution of lithium ions, and inhibiting the growth of

Inactive Publication Date: 2020-05-08
杭州阳名新能源设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charge-discharge cycle of the lithium metal battery, the above-mentioned diaphragm will have safety problems, such as the dendrite problem caused by the uneven deposition of lithium ions on the surface of the negative electrode, which will cause serious consequences in two aspects:
[0005] (1) After the lithium dendrite grows to a certain extent, it breaks and becomes dead lithium, resulting in attenuation of battery capacity;
[0006] (2) Lithium dendrites continue to grow, eventually piercing the separator, resulting in a short circuit between the positive and negative electrodes, a sharp increase in current, causing thermal runaway, and in severe cases, accidents such as fire and explosion
[0007] Therefore, the safety performance of traditional lithium metal batteries is not high, mainly due to the lack of performance of traditional separators in two aspects:
[0008] (1) The generation of lithium dendrites cannot be prevented from the mechanism, and the growth of lithium dendrites can be inhibited from the root;
[0009] (2) Poor high temperature resistance (below 120°C), the heat generated by the internal short circuit will further melt and deform the diaphragm, resulting in a complete short circuit and thermal runaway
[0010] In recent years, in view of the above-mentioned safety problems caused by lithium dendrites, research on methods to improve the safety of lithium metal batteries has attracted increasing attention, such as electrolyte doping, negative electrode surface modification and negative electrode structure improvement, etc., but the direct modification of the diaphragm to inhibit Lithium dendrite growth and treatment methods to improve thermal stability are rare, and there is no diaphragm modification technology that can be put into actual production, so it is urgent to find effective solutions to solve the above problems

Method used

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  • Method for modifying lithium battery diaphragm by temperature-resistant macromolecules and corresponding lithium battery diaphragm
  • Method for modifying lithium battery diaphragm by temperature-resistant macromolecules and corresponding lithium battery diaphragm
  • Method for modifying lithium battery diaphragm by temperature-resistant macromolecules and corresponding lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] First prepare a polyimide solution with a mass fraction of 10%, and weigh the required mass of soluble polyimide precursor material and organic solvent N, N to dimethylformamide according to the proportion; mix the organic solvent N, N ~ Dimethylformamide was slowly added to the polyimide, heated and stirred at 100° C. for 7 hours, and ultrasonicated for 1 hour.

[0062] Select a commercial polyethylene lithium battery separator, cut it into a suitable size, and fix it on the roller collector of the electrospinning spraying device.

[0063] Transfer the prepared polyimide solution to the syringe of the electrospinning spraying device, and remove excess air bubbles; adjust the device parameters, the voltage is 20kV, the drum collector speed is 500r / min, and the injection pump injection speed is 1mL / h , the distance between the high pressure needle and the roller collector is 20cm.

[0064] Turn on the switch of the device and carry out high-pressure spraying for 3 hours...

Embodiment 2

[0068] First configure 10% polyimide solution, and the configuration process is the same as in Example 1.

[0069] Select a commercial polyethylene lithium battery separator, cut it into a suitable size, and fix it on the roller collector of the electrospinning spraying device.

[0070] Transfer the prepared polyimide solution to the syringe of the electrospinning spraying device, and remove excess air bubbles; adjust the device parameters, the voltage is 25kV, the drum collector speed is 100r / min, and the injection pump injection speed is 1mL / h , the distance between the high pressure needle and the roller collector is 25cm.

[0071] Turn on the switch of the device and carry out high-pressure spraying for 2 hours.

[0072] Close the device, take out the modified diaphragm, put it into a vacuum oven, adjust the temperature to 100°C, and dry it for 1 hour to obtain a polyethylene diaphragm modified with polyimide.

[0073] Scanning electron microscope analysis was carried ou...

Embodiment 3

[0075] First prepare a polyimide solution with a mass fraction of 5%, and weigh the required mass of soluble polyimide precursor material and organic solvent dimethylacetamide according to the ratio; slowly add the organic solvent dimethylacetamide into polyimide, heated and stirred at 120° C. for 7 h, and ultrasonicated for 0.5 h.

[0076] Select a commercial polyethylene lithium battery separator, cut it into a suitable size, and fix it on the roller collector of the electrospinning spraying device.

[0077] Transfer the prepared polyimide solution to the syringe of the electrospinning spraying device, and remove excess air bubbles; adjust the parameters of the device, the voltage is 25kV, the rotation speed of the drum collector is 1000r / min, and the injection speed of the syringe pump is 0.5mL / h, the distance between the high pressure needle and the roller collector is 20cm.

[0078] Turn on the switch of the device and carry out high-pressure spraying for 0.5h.

[0079...

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Abstract

The invention discloses a method for modifying a lithium battery diaphragm by using temperature-resistant macromolecules and a corresponding lithium battery diaphragm. The method comprises the steps of fully mixing and stirring a required temperature-resistant macromolecular material and an organic solvent to prepare a precursor solution with a certain mass fraction; cutting the lithium battery diaphragm to be modified, and fixing the cut lithium battery diaphragm on an electrostatic spinning spraying device; adjusting parameters such as the voltage of the electrostatic spinning spraying device, the rotating speed of a roller, the solution injection speed and the distance between a high-pressure needle head and a roller collecting device, and electrostatic spraying or spinning the precursor solution onto the lithium battery diaphragm; and turning off the electrostatic spinning spraying device at the arrival of the required time, flattening the lithium battery diaphragm, and carrying out vacuum drying to obtain the modified lithium battery diaphragm. The modified diaphragm provided by the invention can greatly improve the electrochemical performance and safety performance of the lithium metal battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and specifically relates to a method for modifying a lithium battery diaphragm with a temperature-resistant polymer and a corresponding lithium battery diaphragm. Background technique [0002] Lithium batteries are mainly used for consumer lithium batteries, power batteries and industrial energy storage, and occupy an important part of the entire new energy industry. Among them, electronic digital products are the main application areas of lithium batteries at present, including tablet computers, notebook computers, smart phones, digital cameras and other products, which will surely become the key development direction and main growth point of the market for lithium batteries in the future; in addition, power batteries are The biggest engine of growth in the field of lithium batteries; in addition, the technical application of lithium batteries in energy storage mainly revolves around grid ene...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 沈飞王凯铭曾鼎元韩晓刚
Owner 杭州阳名新能源设备科技有限公司
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