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A wet-formed battery separator with controllable pore size and its preparation method

A battery separator and wet forming technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of easy shrinkage of micropores, inability to guarantee battery safety performance, and high thickness of the separator, and improve the discharge platform and low temperature performance. , The assembly process is simple and easy, and the effect of ensuring safety performance

Active Publication Date: 2021-11-05
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems exist in the existing diaphragm manufacturing process: (1) The porosity is difficult to control: the existing diaphragm manufacturing process is difficult to control the porosity, and the control of the pore size cannot be realized according to the actual situation, and the resistance is large, so it cannot be effective. (2) The micropores are easy to shrink: the micropores will become smaller during use, and the stability is poor; (3) The closing temperature of the micropores is high: micropores The hole needs a particularly high temperature to close, so as to prevent the passage of ions, and the safety performance of the battery cannot be guaranteed; (4) The thickness of the diaphragm is high: the thickness of the diaphragm is thick, which makes the lithium battery have low capacity and short service life; (5) Liquid storage low rate, poor wettability

Method used

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  • A wet-formed battery separator with controllable pore size and its preparation method

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Effect test

Embodiment 1

[0031] A wet-formed battery separator with controllable pore size. The battery separator is based on a three-layer composite film composed of polyolefin microporous film, melted cloth, and wet-laid non-woven fabric containing polyethylene short fibers. A composite membrane formed by radiation grafting of carboxyl and / or sulfonic acid functional groups.

[0032] Wherein, the polyolefin microporous membrane is a polyethylene microporous membrane, the porosity of the polyolefin microporous membrane is greater than 30%, and the thickness of the polyolefin microporous membrane is 0.02-0.07mm. The fused cloth is a polypropylene / polyethylene glycol fused cloth, and the surface density of the fused cloth is 13 to 20 g / m 2 , the porosity is 81~96%, the liquid absorption capacity is greater than 500%, the thickness is 0.11~0.18mm, the number of fibers with a fiber fineness characteristic of 800nm ​​or less accounts for 17~45%, and the fiber fineness characteristic is 800~2000nm The num...

Embodiment 2

[0041] A wet-formed battery separator with controllable pore size. The battery separator is based on a three-layer composite film composed of polyolefin microporous film, melted cloth, and wet-laid non-woven fabric containing polyethylene short fibers. A composite membrane formed by radiation grafting of carboxyl and / or sulfonic acid functional groups.

[0042] Wherein, the polyolefin microporous membrane is a polyethylene microporous membrane, the porosity of the polyolefin microporous membrane is 50-60%, and the thickness of the polyolefin microporous membrane is 0.02-0.04mm. Described melting cloth is polypropylene / polyethylene glycol melting cloth, and the surface density of described melting cloth is 15~18g / m 2 , the porosity is 85~92%, the liquid absorption capacity is greater than 500%, the thickness is 0.13~0.16mm, the number of fibers whose fiber fineness characteristic is below 800nm ​​accounts for 25~37%, and the fiber fineness characteristic is 800~2000nm The numb...

Embodiment 3

[0051] A wet-formed battery separator with controllable pore size. The battery separator is based on a three-layer composite film composed of polyolefin microporous film, melted cloth, and wet-laid non-woven fabric containing polyethylene short fibers. A composite membrane formed by radiation grafting of carboxyl and / or sulfonic acid functional groups.

[0052] Wherein, the polyolefin microporous membrane is a polyethylene microporous membrane, the porosity of the polyolefin microporous membrane is 55%, and the thickness of the polyolefin microporous membrane is 0.03mm. Described fusion cloth is polypropylene / polyethylene glycol fusion cloth, and the surface density of described fusion cloth is 16.5g / m 2 , the porosity is 88.5%, the liquid absorption capacity is 505%, the thickness is 0.14mm, the number of fibers whose fiber fineness characteristic is below 800nm ​​accounts for 31%, and the number of fibers whose fiber fineness characteristic is 800~2000nm accounts for 61%. ,...

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Abstract

The invention provides a wet-formed battery separator with controllable pore size and a preparation method thereof. The multi-layer composite membrane is a substrate, and the composite diaphragm is formed by grafting carboxyl and / or sulfonic acid functional groups through radiation. The wet-formed battery separator with controllable pore size provided by the present invention has low closed cell temperature, high fusing temperature, controllable pore size, high liquid storage rate, and has moderate air permeability after radiation grafting treatment, and the air permeability is about equivalent to conventional 15% of the non-woven separator, and the wet resistance of the battery separator is low, which is conducive to improving the discharge platform and low temperature performance of the battery. There will be no foam during use, and there is no risk of electrolyte overflowing the battery due to foam, which is different from conventional multilayer membranes. Compared with superimposed use, it is more convenient to use, will not cause misalignment and wrinkles, and has low production cost.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a wet-formed battery separator with controllable pore size and a preparation method thereof. Background technique [0002] As the global energy crisis intensifies and environmental issues become more prominent, it is gradually becoming a trend for renewable energy to replace fossil fuels. The storage and use of renewable energy is inseparable from the development of chemical power sources. Among various types of chemical power systems, lithium-ion batteries have become the most popular secondary batteries because of their high voltage, high specific energy, and long life. secondary battery. At present, my country is committed to strengthening the application of lithium-ion batteries in the field of energy storage systems and new energy vehicles and other large-scale power batteries. The ultimate strategic goal of the transition from traditional power vehicles to elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/417H01M50/44H01M50/457H01M50/454H01M50/403H01M50/491
CPCH01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 张恒甄琪张一风刘让同章伟刘雍
Owner ZHONGYUAN ENGINEERING COLLEGE
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