Method for preparing composite lithium-ion battery separator through electrostatic spinning/electrostatic spraying

A technology of electrospinning and electrostatic spraying, which is applied to battery components, circuits, electrical components, etc., can solve the problems of low surface energy, poor compatibility and adhesion, and high processing cost of polytetrafluoroethylene materials, and achieve High electrochemical stability window, excellent thermal shrinkage resistance, and low cost

Inactive Publication Date: 2013-12-25
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PTFE material used has low surface energy, poor wettability, poor compatibility and adhesion with other materials, it needs to be surface modified, and adhesion aids and A small amount of acid, the process is complicated and the processing cost is high

Method used

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  • Method for preparing composite lithium-ion battery separator through electrostatic spinning/electrostatic spraying
  • Method for preparing composite lithium-ion battery separator through electrostatic spinning/electrostatic spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At room temperature, the dried PVDF was weighed and added to a certain amount of DMF / acetone mixed solvent, stirred and dissolved to prepare a polymer spinning solution. Then weigh the nano-Al 2 o 3 and PVDF (mass ratio 0.8:0.2) were added to DMF solvent to prepare nanoparticle suspension.

[0031] The polymer spinning solution is electrospun to prepare PVDF nanofiber membrane and deposited on the receiving device, then the nanoparticle suspension is deposited on the nanofiber membrane by electrostatic spraying, and then a layer of electrospun PVDF nanofiber is received on the inorganic particle layer. The fiber membrane, that is, the electrospinning / electrostatic spraying composite lithium-ion battery separator was obtained.

[0032] The prepared electrospinning / electrostatic spraying composite lithium-ion battery separator was placed in a hot box at 150°C for 1 hour, and the shrinkage rate was 1.25%. The fiber membrane was immersed in ethylene carbonate / dimethyl car...

Embodiment 2

[0034] At room temperature, the dried P(VDF-HFP) was weighed and added to a certain amount of DMF solvent, stirred and dissolved to prepare a polymer spinning solution. Then weigh the nano-SiO 2 and P(VDF-HFP) (mass ratio 0.9:0.1) were added to DMF solvent to prepare nanoparticle suspension.

[0035] The P(VDF-HFP) nanofiber film prepared by electrospinning of the polymer spinning solution is deposited on the receiving device, and then the nanoparticle suspension is deposited on the nanofiber film by electrostatic spraying, and then a layer of inorganic particles is received on the inorganic particle layer. A layer of electrospun P (VDF-HFP) nanofiber membrane is obtained to obtain an electrospinning / electrostatic spraying composite lithium-ion battery separator.

[0025] 5. The preparation process of the inorganic nanoparticle suspension in the electrospinning / electrostatic spraying composite lithium-ion battery diaphragm preparation method provided by the present invention ...

Embodiment 3

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Abstract

The invention relates to the field of lithium-ion batteries, in particular to a method for preparing a composite lithium-ion battery separator through electrostatic spinning/electrostatic spraying. The method specifically includes the steps of firstly, adding high molecular polymer into an organic solvent, dissolving the high molecular polymer through mechanical stirring to form a transparent solution, and obtaining an electrostatic spinning solution; secondly, mixing inorganic nanometer particles with the high molecular polymer and adding the mixture into the organic solvent, and conducting mechanical stirring to obtain inorganic nanometer particle suspension liquid; thirdly, conducting electrostatic spinning on the spinning solution prepared in the first step to prepare a lower layer nanometer fiber film, and enabling the inorganic nanometer particle suspension liquid prepared in the second step to be deposited on the lower layer nanometer fiber film through electrostatic spraying to obtain an interlayer; finally, receiving an electrostatic spun nanometer fiber layer on an inorganic particle layer to obtain the composite lithium-ion battery separator. The composite lithium-ion battery separator has the high imbibing rate and good electrochemical stability under the room temperature and has good heat shrinkage resistance performance at the same time.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a multilayer composite lithium ion battery separator by electrostatic spinning / electrostatic spraying. technical background [0002] Lithium-ion batteries are mainly composed of positive and negative electrodes, separators, electrolytes and pole shells. Among them, the separator is between the positive and negative electrode materials, which plays the role of isolating the positive and negative electrodes, preventing short circuit, preventing electrons from passing through, and allowing ions to pass through. The performance of the separator determines the internal resistance and internal interface structure of the battery, which in turn affects the capacity, charge and discharge performance, cycle performance and safety performance of the battery. [0003] Gel polymer electrolyte refers to the polymer network system formed by the swelling of the polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18D04H1/42D04H1/728H01M50/403H01M50/431H01M50/44H01M50/443H01M50/454H01M50/457H01M50/491
CPCY02E60/10
Inventor 焦晓宁于宾柯鹏康卫民程博闻陈康胡炳辉
Owner TIANJIN POLYTECHNIC UNIV
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