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A method and device for manufacturing a non-aqueous secondary battery separator

A kind of secondary battery, technology of manufacturing method

Active Publication Date: 2019-04-12
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the formation of the cortex, the prior art will adopt the method of delaying the solidification of the cortex, and these methods will also hinder the solidification process of the coating liquid as a whole
Moreover, during the formation of the adhesive porous layer, the interdiffusion of the coagulation liquid and the coating liquid is slow, which is not conducive to the solidification of the coating liquid, resulting in a smaller pore size of the formed adhesive porous layer. In the hot pressing process, The adhesive porous layer with small pore size is prone to collapse, which reduces the ion conductivity of the separator and increases the polarization of the battery. In addition, the existing technology also has defects such as long curing time, large consumption of coagulation liquid, and low production efficiency.

Method used

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  • A method and device for manufacturing a non-aqueous secondary battery separator
  • A method and device for manufacturing a non-aqueous secondary battery separator
  • A method and device for manufacturing a non-aqueous secondary battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The coating solution of this embodiment can adopt polyvinylidene fluoride (PVDF) series resin (Hylar460) and Al 2 o 3 Ceramic powder, with N-methylpyrrolidone (NMP) as solvent, according to the mass ratio of PVDF:Al 2 o 3 : NMP = 7: 10: 93 ratio mixed and dissolved to make. Wherein, the coagulation liquid is an aqueous solution of NMP with a weight percentage of 30%, and the temperature of the coating liquid and the coagulation liquid is selected to be 25°C. The coating solution was coated on a separator (thickness 12 μm, porosity 38.4%, Gurley value 241 s / 100 cc, manufactured by Toray Corporation of Japan) by blade coating. use as figure 1 In the processing equipment shown, the belt tension of the isolation film is controlled to be 80N / m, the belt speed is 2m / min, and the time for passing through the entire coagulation liquid is 50s. When the isolation film is immersed in the coagulation liquid and squeezed by the extrusion device, the surface of the isolation fil...

Embodiment 2

[0081] In this embodiment, on the basis of Embodiment 1, multiple extrusion mechanisms 1 are provided, and the isolation film 10 can be coated on one side or on both sides, such as figure 2 shown.

[0082] Specifically, the coating solution of this embodiment can be prepared by dissolving polyvinylidene fluoride (PVDF) resin (KYNAR2851) produced by ARKEN in dimethylacetamide solvent, wherein the solid content of the resin can be 7% . The coating liquid is coated on the surface of the separator, and then the coating liquid is solidified by inducing a phase transition between the coating liquid and the coagulation liquid by immersing the separator in the coagulation liquid. Wherein, the temperature of the coating liquid and the coagulation liquid may be 25°C. When the isolation membrane 10 is submerged in the coagulation liquid, a plurality of extrusion mechanisms 1 are used to squeeze the isolation membrane 10, and the magnitude of the force applied to the isolation membrane...

Embodiment 3

[0093] The coating solution of the present application can also adopt polyvinylidene fluoride (PVDF) series resin (Hylar460) and Al 2 o 3 Ceramic powder, with N-methylpyrrolidone (NMP) as solvent, according to the mass ratio of PVDF:Al 2 o 3 : NMP = 4: 6: 93 ratio mixed and dissolved to make. Wherein, the coagulation liquid is an aqueous solution of NMP with a weight percentage of 30%, and the temperature of the coating liquid and the coagulation liquid is 25°C. Adopt dip-coating coating solution to be coated on separating film 10 (12 μ m thickness, porosity 38%, M824, Celgard company production), the tape running tension that control separating film 10 conveys is 80N / m, and tape running speed can be 2m / min. When the isolation membrane 10 is immersed in the coagulation liquid and passes through the extruding mechanism 1 arranged at both ends of the connection mechanism 7, specifically, it may be a roller structure, so that the isolation membrane 10 is conveyed along the S...

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Abstract

The present application relates to a method for manufacturing a non-aqueous secondary battery separator, comprising: Step 1, coating a layer of coating liquid on the surface of the separator; Step 2, introducing the separator coated with the coating liquid into the coagulation liquid , and exert pressure on the surface of the isolation membrane to cause material exchange between the coating liquid and the coagulation liquid; and step 3, leading out the coagulation liquid from the isolation membrane where the material exchange between the coating liquid and the coagulation liquid occurs. The non-aqueous secondary battery separator manufacturing method provided by this application, by applying a force to the separator introduced into the coagulation solution, promotes the rapid mutual diffusion of the coating solution and the coagulation solution and then phase inversion, avoiding the impact caused by the coating solution. Diffusion with the coagulation liquid is unfavorable to form an adhesive porous layer with a small pore size, thereby avoiding the collapse of the adhesive porous layer with a small pore size in the hot pressing process, effectively improving the ion conductivity of the separator and reducing battery polarization.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to a method and equipment for making a non-aqueous secondary battery separator that can promote the interdiffusion of coagulation liquid and coating liquid. 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. With the development of lithium battery technology, lithium ion secondary batteries can also be used as a power supply for new energy vehicles. In order to further increase the energy density of lithium-ion secondary batteries, aluminum composite pouch batteries are usually used. However, during the charging and discharging cycle of the battery, along with the progress of charging and discharging, a gap will be formed betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M50/403H01M50/491H01M50/497
CPCH01M50/403Y02E60/10
Inventor 林志强易建建张新枝陶兴华张盛武
Owner NINGDE AMPEREX TECH