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Functional diaphragm for lithium-ion batteries and preparation method and application thereof

A lithium-ion battery, functional technology, applied in the field of functional diaphragms for lithium-ion batteries and its preparation, can solve problems affecting cycle performance, metal cation dissolution, etc., achieve good oxidation resistance and thermal stability, and reduce aging , Improve the effect of cycle performance

Inactive Publication Date: 2019-08-02
安徽金力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the metal cations in the positive electrode material are easy to dissolve during the recycling process of the existing lithium battery diaphragm, and enter the negative electrode from the positive electrode through the diaphragm and deposit on the surface of the negative electrode, thus affecting its recycling performance. The present invention provides a lithium ion Functional diaphragm for battery, preparation method and application thereof

Method used

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  • Functional diaphragm for lithium-ion batteries and preparation method and application thereof
  • Functional diaphragm for lithium-ion batteries and preparation method and application thereof
  • Functional diaphragm for lithium-ion batteries and preparation method and application thereof

Examples

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Embodiment 1

[0044] A functional separator for a lithium ion battery in this embodiment includes a polyethylene separator base material and a zirconium hydrogen phosphate functional material, wherein the added amount of zirconium hydrogen phosphate is 2% of the total amount of the polyethylene separator base material. The functional separator is prepared by a wet process. Specifically, polyethylene raw materials, zirconium hydrogen phosphate and paraffin oil are melt-extruded, and then stretched into a porous film according to the thermally induced phase separation method (TIPS). The key process parameters For: extruder temperature: 170°C, melt temperature: 160°C; casting temperature: 30°C; stretching temperature: 70°C; stretching speed ratio: 6 times. The porous film obtained in this example has the following characteristics: thickness: 50 μm; porosity: 30%; air permeability: 200s / 100cc; strength: greater than or equal to 35Mpa; tortuosity: 15; pore diameter: 10nm.

Embodiment 2

[0046] A functional diaphragm for a lithium ion battery in this embodiment includes a polypropylene diaphragm base material and a zirconium hydrogen phosphate functional material, wherein the added amount of zirconium hydrogen phosphate is 3% of the total amount of the polyethylene diaphragm base material. The functional separator is prepared by a wet process, and the key process parameters are: extruder temperature: 220°C, melt temperature: 205°C; casting temperature: 10°C; stretching temperature: 90°C; stretching speed ratio :4 times. The porous film obtained in this example has the following characteristics: thickness: 30 μm; porosity: 50%; air permeability: 220s / 100cc; strength: greater than or equal to 35Mpa; tortuosity: 20; pore diameter: 30nm.

Embodiment 3

[0048] A functional separator for a lithium ion battery in this embodiment includes a polyethylene separator base material and a zirconium hydrogen phosphate functional material, wherein the added amount of zirconium hydrogen phosphate is 5% of the total amount of the polyethylene separator base material. The functional separator is prepared by a wet process, and the key process parameters are: extruder temperature: 190°C, melt temperature: 180°C; casting temperature: 60°C; stretching temperature: 100°C; stretching speed ratio : 8.5 times. The porous film obtained in this example has the following characteristics: thickness: 5 μm; porosity: 40%; air permeability: 20s / 100cc; strength: greater than or equal to 35Mpa; tortuosity: 3; pore diameter: 50nm.

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Abstract

The invention discloses a functional diaphragm for lithium-ion batteries and a preparation method and an application thereof, and belongs to the technical field of lithium-ion battery diaphragms. Thefunctional diaphragm for the lithium-ion batteries comprises a diaphragm base material and a functional material, wherein the functional material is zirconium hydrogen phosphate with the particle sizebeing 25[mu]m-50[mu]m; and the functional material is directly added to the diaphragm base material to prepare a porous film material, or the functional material is coated on the surface of a porousfilm prepared by taking the diaphragm base material as a raw material in the form of a functional coating. The cycle performance of the lithium-ion battery diaphragm can be effectively improved by adopting the technical scheme of the invention. In addition, the functional diaphragm is simple in preparation process and non-toxic, and can effectively improve the safety performance of the lithium-ionbatteries.

Description

technical field [0001] The invention belongs to the technical field of lithium battery separators, and more specifically relates to a functional separator for lithium ion batteries and a preparation method and application thereof. Background technique [0002] Secondary lithium-ion batteries are used in a variety of fixed and portable devices due to their outstanding advantages such as high energy density, low self-discharge, no memory effect, and relatively low internal resistance. However, the current cycle performance of lithium-ion batteries still cannot fully meet people's growing demand for them, especially when lithium-ion batteries are used in the field of electric vehicles that have high requirements for cruising range. Among them, the diaphragm, as an important part of the lithium-ion battery, has a vital impact on the performance of the battery. The performance of the diaphragm determines the interface structure, internal resistance, etc. of the battery, and direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/446H01M50/449Y02E60/10
Inventor 晋沛沛王杰邓豪胡韬
Owner 安徽金力新能源有限公司
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