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Co-polymer based polymer electrolyte material for lithium battery, compound electrolyte film and its preparation method

A technology of electrolyte materials and polymers, which is applied in the manufacture of electrolyte batteries, batteries with organic electrolytes, non-aqueous electrolyte batteries, etc., can solve problems such as safety, hidden dangers, and limited room temperature conductivity improvement, and achieve the effect of improving conductivity

Active Publication Date: 2008-07-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only improve room temperature conductivity to a limited extent.
At the same time, polymer electrolytes are still a safety hazard due to the lack of thermal runaway control under battery abuse

Method used

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  • Co-polymer based polymer electrolyte material for lithium battery, compound electrolyte film and its preparation method
  • Co-polymer based polymer electrolyte material for lithium battery, compound electrolyte film and its preparation method
  • Co-polymer based polymer electrolyte material for lithium battery, compound electrolyte film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (a) Using mesoporous SiO 2 , first calcined at 500 ° C for 6 hours to remove the template in the channel, referred to as SBA-15, and its particle size is about 1 micron. Prepare 1M LiTFSI / (ethylene carbonate+propylene carbonate) liquid electrolyte, wherein the weight percentage of ethylene carbonate and propylene carbonate is 1:1. Soak SBA-15 powder in liquid electrolyte in a glove box. Soaking time is 4 days. The solution was then filtered.

[0042] (b) Weigh 0.5 g of EO 20 -PO 70 -EO 20Copolymer, referred to as P123. Weigh 0.170 g of LiTFSI (the molecular weight of LiTFSI is 287.08, the molecular weight of P123 is 5800, contains 110 O atoms, the average molecular weight is 580 / 11, and the molar ratio is 16). According to 0%, 5%, 10%, 15%, 20%, 25%, 30% of the total weight percentage of the copolymer and lithium salt, the SBA-15 powder soaked in liquid electrolyte is weighed, and these three are added to 5ml In acetonitrile, stir for 12 hours, and use ultrasoni...

Embodiment 2

[0046] Weigh 0.5 g EO 20 -PO 70 -EO 20 copolymer. LiTFSI was weighed according to O / Li molar ratio of 7, 8, 10, 12, 16, 20, 25, 40. These two were added to 5 ml of acetonitrile and stirred for 12 hours. Then, the solvent was evaporated in a glove box for 12 hours, and further dried in a vacuum oven at 80° C. for 5 hours.

[0047] Figure 7 shows the variation of ionic conductivity with LiTFSI concentration at 30 °C. Figure 8 shows the differential thermal curves of the polymer electrolyte material with an O / Li molar ratio of 16. Figure 9 shows the glass transition temperature T of the samples g Variation with LiTFSI concentration. It can be seen from the figure that the conductivity reaches a maximum value around n=20, which is 4.6×10 -5 Scm -1 . Moreover, this electrolyte material does not crystallize and has a low T g , indicating that its chain segment activity is strong.

Embodiment 3

[0049] Weigh 0.5 g EO 20 -PO 70 -EO 20 copolymer. Weigh LiClO according to the O / Li molar ratio of 6, 7, 8, 10, 12 4 . These two were added to 5 ml of acetonitrile and stirred for 12 hours. Then, the solvent was evaporated in a glove box for 12 hours, and further dried in a vacuum oven at 80° C. for 5 hours.

[0050] Figure 10 shows the ionic conductivity at 30 °C versus LiClO 2 changes in concentration. Figure 11 shows the differential thermal curves of polymer electrolyte materials with an O / Li molar ratio of 8. Figure 1 2 shows the glass transition temperature T of the polymer electrolyte material g With LiClO 4 change in concentration. It can be seen from the figure that the conductivity reaches a maximum value around n=8, which is 8.9×10 -6 Scm -1 . Moreover, this electrolyte material does not crystallize and has a low T g , indicating that its chain segment activity is strong.

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Abstract

The invention provides a copolymer based polymer electrolyte material used for a lithium cell, which comprises a copolymer matrix and alkali metal salts, wherein, the copolymer matrix consists of ethylene oxide cells and propylene oxide cells. The invention also provides a composite electrolyte membrane which comprises the polymer electrolyte material and a preparation method thereof. The copolymer based polymer electrolyte material used for the lithium cell of the invention adopts copolymers as matrix materials; the polymer electrolyte material is prepared through a simple solution casting method, and recombination of the active polymer electrolyte material and a macromolecule diaphragm material is realized by adoption of an infusion method. The polymer electrolyte material of the invention does not comprise organic liquid electrolyte and is incombustible. Moreover, compared with the prior PEO based polymer electrolyte, conductivity is obviously improved; thermorunaway can be prevented; mechanical property is good.

Description

technical field [0001] The present invention relates to a class of polymer electrolyte materials and preparation methods thereof, in particular to a class of energy storage applicable to novel high-performance lithium batteries (including primary lithium batteries, secondary lithium ion batteries and secondary metal lithium batteries) A polymer electrolyte using a copolymer as a matrix in the fields of energy conversion of fuel cells, solar cells, chemical sensors, and electrochemical capacitors, a composite electrolyte membrane thereof, and a preparation method thereof. Background technique [0002] Polymer electrolytes are especially suitable as electrolyte materials for lithium batteries due to their advantages of non-flammability and high packaging efficiency. Traditional polymer electrolytes formed of polyethylene oxide (PEO) and alkali metal salts can achieve high ionic conductivity (greater than 10 -4 Scm -1 ), and can be actually used in fields such as communicati...

Claims

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Application Information

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IPC IPC(8): H01M6/16H01M6/18H01M10/40C08L23/00C08J5/18H01M10/0562H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 南策文王晓亮林元华梅骜
Owner TSINGHUA UNIV
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