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Lithium ion battery diaphragm base material and preparation method thereof

A lithium-ion battery and diaphragm technology, which is applied in the field of lithium-ion battery diaphragm substrates and its preparation, can solve problems affecting ion transmission performance and increasing the ionic impedance of the diaphragm, so as to ensure uniformity, reduce the ionic impedance of the diaphragm, and reduce the impedance Effect

Pending Publication Date: 2022-07-05
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent No. CN108598337B proposes to use double-layer one-time forming and hot pressing process to prepare ultrafine backbone fibers, thermoplastic bonding fibers and nanofibers to obtain a substrate with a support layer and a dense layer. The medium will migrate into the pores between the nanofibers, resulting in local pore closure, affecting the ion transport performance, thereby greatly increasing the ionic impedance of the separator.

Method used

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  • Lithium ion battery diaphragm base material and preparation method thereof
  • Lithium ion battery diaphragm base material and preparation method thereof
  • Lithium ion battery diaphragm base material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A lithium ion battery diaphragm base material is prepared by the following method:

[0030] (1) Control the Tencel chopped fiber (length 4mm, diameter 12μm) at a concentration of 4%, use three disc refiner refining equipment for refining treatment, and the refining power is 180kw to obtain a beating degree of 40°SR. Slurry 1;

[0031] (2) Dilute the concentration of slurry 1 to 0.03% for screening treatment, and pass through three screening machines in turn. The screen meshes of the three screening machines are 100 mesh, 200 mesh and 300 mesh in turn, and the screen meshes of the three screening machines are intercepted. The slurries were mixed together to obtain Slurry 2; then Slurry 2 was diluted to a concentration of 20%, and treated with three disc refiners, with a refining power of 180kw, to obtain Slurry 3 with a beating degree of 95°SR; then Mix slurry 3 and slurry 1 to form a closed sieving-refining circulation system, until all the slurry passes through a 300-...

Embodiment 2

[0035] A lithium ion battery diaphragm base material is prepared by the following method:

[0036] (1), (2) step is with embodiment 1;

[0037] (3) Control the concentration of Tencel fibrillated fiber slurry to 0.25%, sizing through the open headbox, and deposit on the polyester fiber non-woven fabric with a thickness of 18 μm along the outer inclined plate of the open headbox, and vacuum Wet paper sheets are obtained after dehydration and pressing, and dry paper sheets are obtained after the wet paper sheets are dried in a drying cylinder;

[0038] (4) The dry paper sheet is subjected to soft calendering treatment to obtain a lithium ion battery separator substrate, wherein the soft calendering pressure is 80 N / mm and the temperature is less than 100°C.

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Abstract

The invention provides a preparation method of a lithium ion battery diaphragm base material, which comprises the following steps: S1, grinding tencel chopped fibers by using grinding equipment to obtain slurry 1; s2, the pulp 1 passes through a screening-pulp grinding circulation system, and tencel fibrillated fibers with the maximum diameter smaller than 2.5 micrometers are obtained through screening; s3, sizing the tencel fibrillated fibers obtained in the step S2 through an open headbox at the concentration of 0.1-0.3%, depositing the tencel fibrillated fibers on a polyester fiber non-woven fabric along an outer inclined plate of the open headbox, performing vacuum dehydration and squeezing to obtain wet paper sheets, and drying the wet paper sheets in a drying cylinder to obtain dry paper sheets; and S4, carrying out soft calendering treatment on the dry paper sheet to obtain the lithium ion battery diaphragm base material. According to the lithium ion battery diaphragm base material prepared by the method, the polyester fibers can be prevented from being migrated into pores of the fibrillated fibers in a papermaking mode of depositing the fibrillated fibers on the polyester fiber non-woven fabric, so that the ion transport property of the base material can be improved, and the impedance of diaphragm ions is reduced.

Description

technical field [0001] The invention relates to the technical field of battery diaphragm manufacturing, in particular to a lithium ion battery diaphragm base material and a preparation method thereof. Background technique [0002] The development of new energy vehicles is the only way for my country to move from a big automobile country to a powerful automobile country, and it is a strategic measure to deal with climate change and promote green development. However, with the frequent occurrence of spontaneous combustion accidents in electric vehicles in recent years, the safety of battery products has become more and more important. Diaphragm breakage is the direct cause of battery thermal runaway. Polyolefin microporous membrane has excellent mechanical properties, chemical stability and relatively uniform pore structure, and is currently the mainstream membrane in the market. However, the polyolefin microporous membrane has a low heat resistance temperature and a yield s...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/429H01M50/44
CPCH01M50/403H01M50/44H01M50/429Y02E60/10
Inventor 汪洋云娜曾林浩黄志环黄晶晶翁心慧高海彬刘华涛吴佳曼
Owner GUANGDONG IND TECHN COLLEGE