sio 2 /pvdf-hfp composite fiber membrane and its preparation method and application

A technology of PVDF-HFP and composite fiber membrane, which is applied in the field of electrochemistry, can solve problems such as limitations, low mechanical strength, and major safety issues, and achieve the effects of high mechanical strength, improved battery performance, and high porosity

Active Publication Date: 2022-05-06
QINGDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiO 2 The mechanical strength of the nanofiber membrane as a lithium battery separator is low, and when the battery is in a high charge and discharge rate, the battery temperature is too high, there is a big safety problem, which limits its practical application

Method used

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  • sio <sub>2</sub> /pvdf-hfp composite fiber membrane and its preparation method and application

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preparation example Construction

[0040] The embodiment of the present invention provides a SiO 2 The preparation method of / PVDF-HFP composite fiber membrane comprises the following steps:

[0041] Preparation of PVDF-HFP nanofiber membrane: Prepare PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) spinning precursor solution, inject PVDF-HFP spinning precursor solution into the electrospinning device, and use electrospinning method to obtain PVDF- HFP nanofiber membrane;

[0042] Preparation of SiO 2 Fiber membrane: dissolving soluble silicon salt and inorganic acid in solvent to obtain SiO 2 (Silicon dioxide) precursor solution, prepare the template polymer solution, the SiO 2 Precursor solution and template polymer solution are mixed to form hybrid SiO 2 Spinning precursor solution, the hybrid SiO 2 The spinning precursor liquid is injected into the electrospinning device, and hybrid SiO is prepared by electrospinning 2 Nanofibrous membranes, on the resulting hybrid SiO 2 Nanofibrous membranes w...

Embodiment 1

[0059] A SiO 2 The preparation method of / PVDF-HFP composite fiber membrane comprises the following steps:

[0060] Preparation of PVDF-HFP spinning precursor solution: Add PVDF-HFP to acetone and DMF (N,N-dimethylformamide) mixed solvent, stir in a water bath heating environment at 40°C until PVDF-HFP is completely dissolved to obtain PVDF- HFP spinning precursor, the content of PVDF-HFP in the PVDF-HFP spinning precursor is 18wt%, and the mass ratio of acetone and DMF in the mixed solvent is 1: 1;

[0061]Electrospinning PVDF-HFP nanofiber membrane: inject PVDF-HFP spinning precursor liquid into the liquid storage mechanism in the electrospinning device, open the electrospinning device, and deposit PVDF-HFP nanofiber membrane on the drum collector , the PVDF-HFP nanofiber membrane was removed from the drum collector; the spinning parameters of the electrospinning process were spinning distance 16cm, spinning voltage 16kV, the propulsion rate of the propulsion pump was 27μL / m...

Embodiment 2

[0079] A SiO 2 The preparation method of / PVDF-HFP composite fiber membrane comprises the following steps:

[0080] Preparation of PVDF-HFP spinning precursor solution: Add PVDF-HFP to a mixed solvent of acetone and DMF (N,N-dimethylformamide), stir in a water bath heating environment at 50°C until PVDF-HFP is completely dissolved to obtain PVDF- HFP spinning precursor, the content of PVDF-HFP in the PVDF-HFP spinning precursor is 22wt%, and the mass ratio of acetone and DMF in the mixed solvent is 1: 1;

[0081] Electrospinning PVDF-HFP nanofiber membrane: inject PVDF-HFP spinning precursor liquid into the liquid storage mechanism in the electrospinning device, open the electrospinning device, and deposit PVDF-HFP nanofiber membrane on the drum collector , the PVDF-HFP nanofiber membrane was removed from the drum collector; the spinning parameters of the electrospinning process were spinning distance 20cm, spinning voltage 22kV, the propulsion rate of the propulsion pump was ...

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Abstract

The present invention proposes SiO 2 / PVDF-HFP composite fiber membrane and its preparation method and application, the preparation method includes the following steps: preparing PVDF-HFP nanofiber membrane: preparing PPVDF-HFP spinning precursor solution, and using electrospinning to obtain PVDF-HFP nanofiber membrane ; Preparation of SiO 2 Fiber membrane: Prepare SiO separately 2 Precursor solution and prepared template polymer solution, mix the two to form hybrid SiO 2 Spinning precursor solution, hybrid SiO prepared by electrospinning 2 Nanofibrous membranes, on the resulting hybrid SiO 2 Nanofibrous membranes were annealed at high temperature to remove template polymers to yield SiO 2 Fiber membrane; material composite: bond PVDF‑HFP nanofiber membrane and SiO with battery-specific adhesive 2 SiO 2 / PVDF‑HFP composite fiber membrane. The application of the composite fiber membrane to the lithium battery can improve the performance of the battery, and when the lithium battery is at a high charge and discharge rate, the battery separator can produce a closed cell effect, which can improve the safety of the battery.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to SiO 2 / PVDF-HFP composite fiber membrane and its preparation method and application. Background technique [0002] As an important part of lithium-ion batteries, separators have received continuous attention from R&D laboratories around the world. The lithium battery separator prepared by electrospinning technology has many advantages such as high porosity, liquid absorption rate, specific surface area, uniform pore size distribution and small pore size. [0003] Chinese patent CN201710133122 "a lithium battery separator and its preparation method and application in lithium batteries" discloses the preparation of pure inorganic SiO by electrospinning 2 Nanofibrous membranes are used in Li-ion battery separators, this SiO 2 The nanofibrous membrane has high thermal stability, high porosity, high electrolyte absorption rate and high lithium ion conductivity, so that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/446H01M10/052H01M10/0525D01D5/00B32B27/02B32B27/30B32B7/12B32B27/12B32B9/04B32B9/00H01M50/489
CPCH01M10/052H01M10/0525D01D5/003B32B5/02B32B5/26B32B7/12B32B27/12B32B9/047B32B2457/10B32B2307/306B32B2307/202B32B2307/50B32B2262/0238B32B2262/10B32B2250/02B32B2250/20H01M50/446H01M50/403Y02E60/10
Inventor 龙云泽徐源于淼朱建伟王晓雄张俊李晓
Owner QINGDAO UNIV
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