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Separator for non-aqueous secondary battery

A secondary battery, non-aqueous technology, used in battery pack parts, separators/films/diaphragms/spacers, circuits, etc. To achieve the effect of reducing polarization resistance, improving adhesion, and facilitating diffusion and conduction

Active Publication Date: 2016-12-07
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During these processes, PVDF will swell, causing the pores of the coating to be blocked and the pore structure of the coating to collapse.

Method used

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  • Separator for non-aqueous secondary battery
  • Separator for non-aqueous secondary battery
  • Separator for non-aqueous secondary battery

Examples

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preparation example Construction

[0047] The present application also relates to the preparation method of the lithium-ion battery diaphragm, which at least includes the following steps: adding adhesive and ceramic material particles to an organic solvent to prepare a coating liquid, coating the coating liquid on a substrate, and then immersing the In the coagulation solution, a substrate with a coating is formed, and the wet film thickness of the coating is 1-3 μm, preferably 1.4-2.2 μm.

[0048] This application uses the principle of phase inversion method to prepare the coating of the diaphragm, wherein the solvent used is oily, PVDF can be dissolved in the solvent; the non-solvent is water-based, PVDF is insoluble in the non-solvent; and the solvent and the non-solvent are miscible. After PVDF is dissolved in an oily solvent, it is mixed with ceramics to form a coating solution. The coating solution is coated on the isolation film, and the isolation film is immersed in a non-solvent to exchange the solvent...

Embodiment 1

[0056] A diaphragm for a non-aqueous secondary battery comprises a diaphragm substrate and a coating attached to the surface of the substrate, and the surface layer of the coating includes a bonding area and an electrolyte diffusion area.

[0057] The preparation method of the membrane of the present application is:

[0058] 1. Dissolve the PVDF resin KYNAR2851 produced by ARKEN in the solvent dimethylacetamide to make a coating solution. The solid content of the resin is 5%, and the mass ratio of resin to solvent is 5:93; add ceramic particle materials, ceramic The parameters such as the type, particle size and content of the granular material are shown in Table 1;

[0059] 2. The coating solution is coated on a porous substrate (TN0901: SK company, 9 μm thickness, porosity 43%) by an OSB-17 wire bar to form a coating solution coating, and the ratio of the coating to ceramic material particles is as follows As shown in Table 1;

[0060] 3. Immerse the coating liquid coating...

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Abstract

The invention relates to the field of a lithium-ion battery and specifically relates to a separator for a non-aqueous secondary battery. The separator for the non-aqueous secondary battery provided by the invention comprises a separator base material and a coating attached on the surface of the base material. The surface layer of the coating comprises an adhering area and an electrolyte diffusion area. According to the separator for the non-aqueous secondary battery provided by the invention, the adhering strength of the separator and an electrode can be improved, moreover, after a battery technology production process is carried out, and a pore structure can stilled be kept, thereby facilitating diffusion and conduction of electrolyte and reducing polarization impedance.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, in particular, to a diaphragm for a non-aqueous secondary battery. Background technique [0002] Non-aqueous secondary batteries, especially lithium-ion secondary batteries, are widely used to power portable electronic devices such as notebook computers, digital cameras, video cameras and mobile phones due to their high energy density and good rate performance. In recent years, lithium-ion secondary batteries have been widely developed as power supplies for new energy vehicles. In recent years, in order to further increase the energy density, aluminum composite pouch batteries have been used. However, during the cycle, as the charge and discharge progress, a gap will be formed between the electrode and the separator, resulting in a decrease in cycle capacity and affecting life. Therefore, how to solve the problem of the gap between the separator and the electrode is one of the key...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18
CPCH01M50/409H01M50/463Y02E60/10
Inventor 张新枝张磊易建建陶兴华张盛武
Owner DONGGUAN AMPEREX TECH
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