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Process for combining amphipathy segmented copolymer electrolyte of POEM-PDMS

An amphiphilic block and copolymer technology, applied in the direction of circuits, electrical components, battery pack components, etc., can solve the problems of battery fire and combustion, battery thermal runaway, and failure to fundamentally solve the safety problem of lithium-ion batteries. Achieve the effects of small equipment investment, convenient operation and simple preparation process

Active Publication Date: 2012-06-20
菏泽天宇锂电能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the organic electrolyte still exists in the battery, it does not fundamentally solve all the safety problems of lithium-ion batteries.
Among them, the most prominent problem is that under the overcharge condition of the polymer lithium-ion battery, like the liquid lithium-ion battery, the lithium cobalt oxide positive electrode material undergoes a decomposition reaction, releasing a large amount of heat and active oxygen, causing the negative electrode material, binder, etc. A series of exothermic reactions with the electrolyte can also lead to thermal runaway of the battery, causing the battery to catch fire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a) 200 ml of polyethylene glycol methyl ether methacrylate monomer (PEGMEM, the number of oxyethylene EO segments is 5), 60 ml of polydimethylsiloxane monomer (PDMS) in a weight ratio of 80:20 , dissolved in 1000 ml of ethyl acetate;

[0022] b) Dissolve 60 mg of initiator 2,2'-azobisisobutyronitrile in 100 ml of ethyl acetate;

[0023] c) Mix the above two ethyl acetate solutions evenly and transfer them to an airtight flask;

[0024] d) Evacuate the air in the ethyl acetate mixed solution with pure argon for 30 minutes;

[0025] e) Heat the ethyl acetate mixed solution to 60°C and keep it warm for 24 hours;

[0026] f) washing the polymer product obtained in step e with petroleum ene, and drying in vacuum to obtain POEM-g-PDMS amphiphilic block copolymer;

[0027] g) Using tetrahydrofuran as a solvent, lithium trifluoromethanesulfonate was doped with POEM-g-PDMS copolymer at a ratio of Li : EO = 1:5;

[0028] h) POEM-g-PDMS copolymer electrolyte membrane was obtai...

Embodiment 2

[0031] a) 130 ml of polyethylene glycol methyl ether methacrylate monomer (PEGMEM, the number of oxyethylene EO segments is 15), 60 ml of polydimethylsiloxane monomer (PDMS) according to the design ratio (weight ratio 70:30) dissolved in 1000 ml ethyl acetate;

[0032] b) 60 mg of initiator 2,2'-azobisisobutyronitrile was dissolved in 100 ml of ethyl acetate;

[0033] c) Mix the above two ethyl acetate solutions evenly and transfer them to an airtight flask;

[0034] d) Evacuate the air in the ethyl acetate mixed solution with pure argon for 30 minutes;

[0035] e) Heat the ethyl acetate mixed solution to 68°C and keep it warm for 24 hours;

[0036] f) washing the polymer product obtained in step e with petroleum ene, and drying in vacuum to obtain POEM-g-PDMS amphiphilic block copolymer;

[0037] g) Using tetrahydrofuran as a solvent, lithium trifluoromethanesulfonate was doped with a POEM-g-PDMS copolymer at a ratio of Li : EO = 1: 20;

[0038] h) POEM-g-PDMS copolymer e...

Embodiment 3

[0041] a) 130 ml of polyethylene glycol methyl ether methacrylate monomer PEGMEM, the number of oxyethylene EO segments is 30), 60 ml of polydimethylsiloxane monomer (PDMS) in a weight ratio of 70:30, Dissolved in 1000 ml ethyl acetate;

[0042] b) 60 mg of initiator 2,2'-azobisisobutyronitrile was dissolved in 100 ml of ethyl acetate;

[0043] c) Mix the above two ethyl acetate solutions evenly and transfer them to an airtight flask;

[0044] d) Evacuate the air in the ethyl acetate mixed solution with high-purity argon for 30 minutes;

[0045] e) Heat the ethyl acetate mixed solution to 80°C and keep it warm for 24 hours;

[0046] f) washing the polymer product obtained in step e with petroleum ene, and drying in vacuum to obtain POEM-g-PDMS amphiphilic block copolymer;

[0047] g) Using tetrahydrofuran as a solvent, lithium trifluoromethanesulfonate was doped with POEM-g-PDMS copolymer at a ratio of Li : EO = 1: 30;

[0048] h) POEM-g-PDMS copolymer electrolyte membrane...

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PUM

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Abstract

The invention discloses a process for combining amphipathy segmented copolymer electrolyte of POEM (polyoxyethylene methyl methacrylate)- PDMS (polydimethylsiloxane). The prepared electrolyte film is used for manufacturing a novel full solid lithium ion battery. In the combining process of a copolymer, users can control the length of the hydrophilic POEM section and the component proportion of the POEM and the PDMS to simultaneously increase glass-transition temperature of the copolymer, reduce room temperature viscosity coefficient of the copolymer, increases dosage concentration of lithium ions in the POEM-g-PDMS amphipathy segmented copolymer electrolyte, and improves conductivity of the lithium ions of the copolymer electrolyte. The copolymer electrolyte is simple in combining process, less in equipment investment and suitable for industrial production.

Description

technical field [0001] The invention relates to a process for synthesizing an amphiphilic block copolymer electrolyte of POEM (polyoxyethylene methyl methacrylate)-PDMS (polydimethylsiloxane), and belongs to the technical field of new materials. Background technique [0002] Lithium-ion battery is a new generation of rechargeable battery, which has the advantages of high energy / power density, high working voltage (~3.7V), small self-discharge, no memory effect, green and pollution-free, and is by far the best overall performance battery unit. In the past two decades, lithium-ion batteries have developed rapidly, and have dominated the field of portable electronic devices such as notebook computers, mobile phones, and digital cameras, as well as power tools, due to their high performance and low price ratio. At present, lithium-ion batteries have been developed as power sources for hybrid electric vehicles (HEV) and electric vehicles (EV), and have gradually been expanded as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L57/06C08L83/04C08F299/02C08G77/38H01M2/16
CPCY02E60/12Y02E60/10
Inventor 韦伟峰胡许先
Owner 菏泽天宇锂电能源科技有限公司
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