Method for preparing lithium ion battery employing organic-inorganic composite gel polymer electrolyte

A lithium-ion battery and composite gel technology, applied in the field of lithium-ion battery preparation, can solve problems such as insufficient contact, large internal resistance, explosion, etc., to reduce interface impedance, improve affinity, and improve compatibility sexual effect

Inactive Publication Date: 2019-03-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the liquid electrolyte used in commercial lithium-ion batteries has risks such as leakage, fire, and explosion.
The gelation of the liquid electrolyte can reduce leakage, but the prefabricated gel polymer electrolyte before assembling the battery must make a compromise between the practical mechanical strength and the flexibility required to conduct lithium ions, and at the same time face the problem of contact with the solid electrode. The problem of high internal resistance caused by insufficient interface contact and the decrease of lithium ion diffusion rate after gelation

Method used

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  • Method for preparing lithium ion battery employing organic-inorganic composite gel polymer electrolyte
  • Method for preparing lithium ion battery employing organic-inorganic composite gel polymer electrolyte
  • Method for preparing lithium ion battery employing organic-inorganic composite gel polymer electrolyte

Examples

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Embodiment 1

[0030] In this example, see figure 1 , a preparation method of a lithium ion battery using an organic-inorganic composite gel polymer electrolyte, comprising the steps of:

[0031] The ethylene separator was modified with 3-methacryloxypropyltrimethoxysilane functionalized silica nanoparticles, and the surface-functionalized inorganic oxide nanoparticles 4 were uniformly immobilized on the surface of the separator 3 and its internal pores. The separator 3 is modified; then the modified separator 3 is cut to the size required for the preparation of the target lithium ion battery, and the cut and modified separator 3 is sandwiched between the lithium cobaltate positive electrode 1 and the metal lithium negative electrode material 8 for setting , put it into the battery outer packaging 7 after being stacked; then inject the initiator group containing functionalized oligomer component 2, namely polyethylene glycol dimethacrylate and azobisisoheptanonitrile, into the electrolyte ca...

Embodiment 2

[0047] This embodiment is basically the same as Embodiment 1, especially in that:

[0048] In this embodiment, a method for preparing a lithium-ion battery using an organic-inorganic composite gel polymer electrolyte includes the following steps:

[0049] The polyethylene-polypropylene-polyethylene composite separator is modified with vinyltriethoxysilane functionalized zirconia nanoparticles, and the surface-functionalized inorganic oxide nanoparticles 4 are uniformly fixed on the surface of the separator 3 and its internal pores , modify the separator 3; then cut the modified separator 3 to the size required for the preparation of the target lithium-ion battery, sandwich the trimmed modified separator 3 between the lithium iron phosphate positive electrode 1 and the graphite negative electrode material 8 After being stacked, put them into the battery outer packaging 7; then inject the functionalized oligomer component 2, namely ethoxylated trimethylolpropane triallyl ether a...

Embodiment 3

[0056] This embodiment is basically the same as the previous embodiment, and the special features are:

[0057] In this embodiment, a method for preparing a lithium-ion battery using an organic-inorganic composite gel polymer electrolyte includes the following steps:

[0058] The cellulose separator was modified with titanium dioxide nanoparticles functionalized with 3-methacryloyloxypropyltris(2-methoxyethoxy)silane, and the surface-functionalized inorganic oxide nanoparticles 4 were uniformly immobilized on the surface of the separator 3 and its internal pores, the diaphragm 3 is modified; then the modified diaphragm 3 is cut into the size required for the preparation of the target lithium ion battery, and the trimmed modified diaphragm 3 is sandwiched between the ternary lithium positive electrode 1 and carbon silicon Set between the composite negative electrode materials 8, put them into the battery outer packaging 7 after being stacked; then inject the functionalized olig...

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Abstract

The invention discloses a method for preparing a lithium ion battery employing an organic-inorganic composite gel polymer electrolyte. The preparation method comprises the steps: uniformly fixing thesurface-functionalized inorganic oxide nanoparticles to the surface of a membrane and in the internal pores by chemical bonds, sandwiching the modified membrane between the positive and negative materials, injecting an electrolyte mixed with a functionalized low polymer and an initiator, and initiating the in-situ polymerization crosslinking of the oligomer by heating to gel the liquid substancesinside the battery to obtain a lithium ion battery based on the organic-inorganic composite gel polymer electrolyte. The gel forming electrolyte of the invention not only prevents the risk of electrolyte leakage, but also reduces the reactivity of solvent molecules on the electrode surface. A liquid state electrolyte system before polymerization can fully wet the electrode material and reduce theelectrode / electrolyte interface resistance. The inorganic / polymer compatibility is enhanced by the double-bond copolymerization of a double-bond functional group on the inorganic nanoparticle surfaceand an oligomer chain end. The obtained components are uniform after polymerization.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery with an organic-inorganic composite electrolyte, in particular to a preparation method for a lithium-ion battery with a polymer-based organic-inorganic composite electrolyte, which is applied in the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in daily life due to their advantages such as high energy density, no memory effect during charging and discharging, no pollution during use, small self-discharge during storage, and long cycle life. Diaphragm and electrolyte are important components of lithium-ion batteries, which not only ensure the electronic insulation between the positive and negative electrodes inside the battery, but also provide lithium-ion transmission channels. Security matters. [0003] At present, the liquid electrolyte used in commercial lithium-ion batteries has risks such as leakage, fire, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0085Y02E60/10
Inventor 施利毅李锐王竹仪袁帅
Owner SHANGHAI UNIV
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