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Lithium-ion battery gel electrolyte and preparation method thereof

A gel electrolyte and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor mechanical properties, discounted battery performance, and difficulty in dispersing, so as to increase the conductivity of lithium ions and increase heat dissipation. Stability, beneficial effect of wetting

Active Publication Date: 2017-09-12
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gel electrolyte batteries usually use polymers such as PVDF, PAN, PMMA, PEO, PVC, etc. as the electrolyte matrix. However, these polymers have the following defects: when the ionic conductivity is high, the mechanical properties are not good, and when the mechanical strength is high, the ionic conductivity is low.
However, in practice, the surface energy of nanoparticles is high, which is easy to agglomerate and difficult to disperse. At the same time, the compatibility of nanoparticles with most polymer electrolytes is very poor, and the addition of nanoparticles will also increase the viscosity of traditional polymer electrolytes. It is not conducive to the infiltration of the polymer electrolyte to the electrode and the separator, so the effect of improving the performance of the battery is greatly reduced

Method used

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  • Lithium-ion battery gel electrolyte and preparation method thereof
  • Lithium-ion battery gel electrolyte and preparation method thereof
  • Lithium-ion battery gel electrolyte and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0037] Preparation of liquid-filled batteries: graphite and lithium cobaltate are used as active materials for anode and cathode, respectively, conductive agents and adhesives are added, and the anode and cathode to be wound are obtained through stirring, coating, cold pressing, slitting, welding and other processes. The pole piece is then wound together with the separator to obtain the bare cell, and the aluminum-plastic film is used to seal the top and side of the packaging bag, and then baked in a Baking furnace until the water content is lower than 200ppm;

[0038] Liquid injection and cell molding: inject the prepared electrolyte into the baked cell, let it stand until the electrolyte fully infiltrates the entire diaphragm, and then perform heating polymerization, shaping, degassing and other processes to finally obtain the formed cell core.

Embodiment 1

[0040] Organic compound-nanoparticle composite SiO 2 -OA1 (OA1 here is for SiO 2 A naming method of -O-A, where A refers to the organic compound monomer, SiO 2and the organic compound monomer are connected by -O-bond, and the following OA2 has the same meaning) synthesis:

[0041] 1g of nano-SiO with an average particle size of 20nm 2 Disperse in 200ml n-hexane solution to obtain a suspension; at room temperature, add 0.5g (COOH-CH 2 -CH 2 -O-CH=CH 2 ) Propionic acid vinyl ether, heated up to 60 ℃ and reacted for 4h; the obtained liquid was filtered, and water and organic solvent were distilled off under reduced pressure to obtain a clear and transparent organic compound-nanoparticle composite agent SiO 2 -OA1, about 90% yield.

Embodiment 2

[0043] Organic compound-nanoparticle composite SiO 2 Synthesis of -OA2:

[0044] 1g of nano-SiO with an average particle size of 20nm 2 Disperse into 200ml of n-hexane solution to obtain a suspension; add 15g of propionic acid vinyl ether to the suspension at room temperature, raise the temperature to 60°C and react for 4h; filter the obtained liquid, and distill under reduced pressure to remove water and organic Solvent, that is, to obtain a clear and transparent organic compound-nanoparticle composite agent SiO 2 -OA2 in about 91% yield.

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Abstract

The invention discloses a gel electrolyte of a lithium ion battery and a preparation method of the gel electrolyte. The gel electrolyte comprises a solvent, an additive, lithium salt and an organic polymer-nanoparticle combination agent, wherein organic polymers and nanoparticles in the combination agent are combined by forming a new covalent bond. Compared with the prior art, the lithium ion battery with the gel electrolyte has the advantages that the problems of difficulty in uniform dispersion, easiness in settlement and viscosity increase caused by direct addition of the nanoparticles into an existing gel electrolyte are solved; the organic polymer-nanoparticle combination agent is clear and transparent, and low in viscosity; the lithium ion conduction performance of the gel electrolyte can be improved, and the heat stability, oxidation resistance and all mechanical performances of a cell can be improved; the prepared lithium ion battery is high in capacity and ideal in safety performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a lithium-ion battery gel electrolyte and a preparation method thereof. Background technique [0002] Due to the advantages of high voltage, small size, light weight, high energy density, no memory effect, good environmental protection and long cycle life, lithium-ion batteries have gradually replaced traditional batteries such as lead-acid and Ni-Cd, and gained market dominance. status. [0003] Lithium-ion batteries are divided into liquid electrolyte batteries and gel electrolyte batteries due to different electrolytes. In contrast, liquid electrolyte batteries have better electrochemical performance and poor safety; gel electrolyte batteries have the advantages of high safety performance, good cycle performance, long storage life and wide temperature range. Gel electrolyte batteries usually use polymers such as PVDF, PAN, PMMA, PEO, PVC, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565B82Y30/00
CPCY02E60/10
Inventor 修倩游从辉张新枝赖旭伦江辉
Owner DONGGUAN AMPEREX TECH
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