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Method for preparing solid polymer electrolyte lithium ion battery

A solid-state polymer, lithium-ion battery technology, used in the preparation of gel/all-solid-state polymer electrolyte lithium-ion batteries, based on in-situ electrospinning to prepare solid-state polymer electrolyte lithium-ion batteries, can solve the precursor solution phase Poor tolerance, increased ohmic polarization of the battery, and low porosity of the separator, to achieve the effects of high mechanical strength, stable capacity, and stable chemical properties

Inactive Publication Date: 2015-05-20
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(D.Zhou, Y.B.He, Q.Cai, et.al.Journal of Materials Chemistry A, 2014, 2, 20059-20066.) This method usually needs to soak the precursor solution into the membrane to achieve in-situ polymerization, but the common commercial The separator has low porosity and poor compatibility with the precursor solution, which brings about a series of problems such as increased ohmic polarization of the battery and deterioration of interface impedance.

Method used

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  • Method for preparing solid polymer electrolyte lithium ion battery
  • Method for preparing solid polymer electrolyte lithium ion battery
  • Method for preparing solid polymer electrolyte lithium ion battery

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Embodiment 1

[0029] Step 1) Dissolve polymethyl methacrylate in tetrahydrofuran to obtain a solution for electrospinning with a mass fraction of 25%, and then add the solution for electrospinning into the syringe of the electrospinning device, and the moving speed of the nozzle is 50mm / s, the moving distance is 300mm, the spinning temperature is 50°C, and the electrospinning is performed under the conditions of the voltage 20kV, and a 20-micron-thick electrospinning fiber membrane is obtained on the receiver covered with the lithium cobalt oxide electrode membrane;

[0030] Step 2) Weigh the following components according to the following mass relationship, succinonitrile: acrylonitrile: lithium hexafluorophosphate: boron trifluoride=75:10:14.9:0.1. heating and melting succinonitrile at 60°C, adding acrylonitrile, lithium hexafluorophosphate and boron trifluoride into the succinonitrile melt and mixing them uniformly to obtain a solid polymer electrolyte precursor;

[0031] Step 3) heatin...

Embodiment 2

[0034] Step 1) Dissolving polyacrylonitrile in acetone to obtain a solution for electrospinning with a mass fraction of 30%, then adding the solution for electrospinning into the syringe of the electrospinning device, moving the nozzle at a speed of 50mm / s, moving Electrospinning was carried out at a distance of 300mm, a spinning temperature of 50°C, and a voltage of 20kV, and an electrospun fiber membrane with a thickness of 20 microns was obtained on a receiver covered with a graphite electrode membrane;

[0035] Step 2) Take the following components according to the following mass relationship, isophthalonitrile: diethylene glycol dimethacrylate: lithium bis(trifluoromethylsulfonate) imide: azobisisobutyronitrile=70 :15:14.5:0.5. Heat and melt isophthalonitrile at 50°C, add diethylene glycol dimethacrylate, lithium bis(trifluoromethylsulfonate)imide, and azobisisobutyronitrile into isophthalonitrile melt After mixing uniformly, the solid polymer electrolyte precursor is ob...

Embodiment 3

[0039] Step 1) dissolving polyvinylidene fluoride in acetonitrile to obtain a solution for electrospinning with a mass fraction of 20%, then adding the solution for electrospinning into the syringe of the electrospinning device, and moving the nozzle at a speed of 50mm / s, Electrospinning was carried out under the conditions of a moving distance of 300mm, a spinning temperature of 50°C, and a voltage of 20kV, and an electrospun fiber membrane with a thickness of 20 microns was obtained on the receiver covered with a lithium cobalt oxide electrode membrane;

[0040] Step 2) Take the following components according to the following mass relationship, ethylene carbonate: diethyl carbonate: ethyl methyl carbonate: triethylene glycol diacrylate: lithium hexafluorophosphate: lauroyl peroxide=20:30:30:10: 9.8:0.2. Adding triethylene glycol diacrylate, lithium hexafluorophosphate, and lauroyl peroxide into a solvent of ethylene carbonate and diethyl carbonate and mixing them uniformly t...

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Abstract

The invention provides a method for preparing a solid polymer electrolyte lithium ion battery. The method comprises the following steps: A, dissolving a high polymer into an organic solvent, and then performing electrostatic spinning to obtain a thin-layer electrostatic spinning fiber membrane on a receiver covered by an anode diaphragm; B, adding a crosslinking monomer, a lithium salt and an initiating agent into an electrolyte solvent, and mixing uniformly to prepare a precursor; C, pouring the precursor prepared in the step B into the electrostatic spinning fiber membrane, and performing curtain coating uniformly in the electrostatic spinning fiber membrane; and D, assembling a solid polymer electrolyte / electrode diaphragm and a counter electrode diaphragm into a cell, putting the cell into a shell or a bag, sealing, heating to realize in situ synthesis of the solid polymer electrolyte, and sequentially performing formation, shaping and degassing processes to prepare a formed battery. The method provided by the invention can be simultaneously used for preparing a gel / all-solid polymer electrolyte lithium ion battery, and the obtained battery is small in interface impedance, high in mechanical strength and high in safety performance.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium battery manufacturing, and relates to the preparation of an electrolyte battery for solid-state lithium-ion batteries, which can be used for the preparation of gel / all-solid-state polymer electrolyte lithium-ion batteries at the same time, and in particular to an in-situ-based lithium-ion battery. Method for preparing solid-state polymer electrolyte lithium-ion battery by electrospinning. Background technique [0002] Modern human life is inseparable from mobile chemical power sources. Li-ion batteries are widely used in various small portable devices due to their environmental friendliness, high operating voltage, large specific capacity and long cycle life. The new green chemical power source. However, with the improvement of living tastes, people have put forward higher requirements for mobile appliances: lighter, thinner, smaller and more durable; therefore, as the power supply un...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 康飞宇周栋贺艳兵柳明李宝华杨全红杜鸿达游从辉
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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