Modification method of polymer solid polyelectrolyte

A polyelectrolyte and polymer technology, which is applied in the direction of composite electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte battery, etc., can solve the problems of affecting the performance of polymer electrolyte, poor film uniformity, and poor compatibility, so as to improve compatibility , reduce crystallinity, low cost effect

Pending Publication Date: 2021-05-28
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these inorganic nanoparticles are easy to agglomerate, and mixing with PEO polyelectrolyte will easily lead to poor uniformity of the film, thus affecting the performance of the polymer electrolyte.
Although there are silane coupling agents to modify inorganic nanoparticles, this technology is only a physical modification and cannot effectively solve the problem of poor compatibility between inorganic particles and polymer electrolytes

Method used

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  • Modification method of polymer solid polyelectrolyte
  • Modification method of polymer solid polyelectrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) PEO modified TiO 2 Nanoparticles (PEO-TiO 2 ) preparation

[0024] 20 parts by mass of titanium sulfate and 0.1 part by mass of polyethylene oxide (PEO) with a molecular weight of 400 were added to 50 mL of deionized water, and fully stirred to make them evenly mixed. Then, the mixed solution was added dropwise to 2.1wt% sodium hydroxide solution, and after a certain period of time, the precipitate was separated by centrifugation, and then it was placed in 0.2mol / L nitric acid solution and refluxed at a temperature of 80°C. After 1 h, the precipitate was separated by centrifugation, washed thoroughly with absolute ethanol, and dried thoroughly to obtain PEO-modified TiO 2 Nanoparticles (PEO-TiO 2 ).

[0025] 2) PEO-TiO 2 Preparation of Nanoparticles and Polyethylene Oxide-Polyphenylene Ether Copolymer Polyelectrolyte Composite Membrane

[0026] The polyethylene oxide-polyphenylene ether copolymer of 65 mass parts is dissolved in xylene, adds the PEO-TiO that 0....

Embodiment 2

[0029] 1) PEO modified TiO 2 Nanoparticles (PEO-TiO 2 ) preparation

[0030] 78 parts by mass of titanium sulfate and 20 parts by mass of PEO with a molecular weight of 1000 were added to 200 mL of deionized water, and fully stirred to make them evenly mixed. Then, add the mixed solution dropwise to 10.0wt% sodium hydroxide solution, after a certain period of time, centrifuge to separate the precipitate, then place it in 2.0mol / L nitric acid solution, and reflux at a temperature of 30°C After 3 h, the precipitate was separated by centrifugation, washed thoroughly with absolute ethanol, and dried thoroughly to obtain PEO-modified TiO 2 Nanoparticles (PEO-TiO 2 ).

[0031] 2) PEO-TiO 2 Preparation of Nanoparticles and Polyethylene Oxide-Polyphenylene Ether Copolymer Polyelectrolyte Composite Membrane

[0032] The polyethylene oxide-polyphenylene ether copolymer of 98 mass parts is dissolved in xylene, adds the PEO-TiO that 45 mass parts step 1) prepares 2 The nano-particl...

Embodiment 3

[0035] 1) PEO modified TiO 2 Nanoparticles (PEO-TiO 2 ) preparation

[0036] 55 parts by mass of titanium sulfate and 10 parts by mass of PEO with a molecular weight of 600 were added to 120 mL of deionized water, and fully stirred to make them evenly mixed. Then, add the mixed solution dropwise to 5.0wt% sodium hydroxide solution, after a certain period of time, centrifuge to separate the precipitate, then place it in a 1.0mol / L nitric acid solution, and reflux at a temperature of 50°C After 2 h, the precipitate was separated by centrifugation, washed thoroughly with absolute ethanol, and dried thoroughly to obtain PEO-modified TiO 2 Nanoparticles (PEO-TiO 2 ).

[0037] 2) PEO-TiO 2 Composite of Nanoparticles and Polyethylene Oxide-Polyphenylene Ether

[0038] The polyethylene oxide-polyphenylene ether copolymer of 80 mass parts is dissolved in xylene, adds the PEO-TiO that 30 mass parts step 1) prepares 2 Nanoparticles, fully stirred and dispersed evenly, then added b...

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Abstract

The invention discloses a modification method of a polymer solid polyelectrolyte, and belongs to the technical field of solid polyelectrolyte diaphragms. The PEO modified nano TiO2 is adopted and then compounded with the polyalkylene oxide-polyphenyl ether copolymer, so that the compatibility of inorganic particles and a PEO polymer matrix is effectively improved, the TiO2 nano particles are more uniformly dispersed in an organic polymer matrix, the movement ability of a PEO chain segment is improved, the crystallinity of a polymer is effectively reduced, and the ionic conductivity is improved.

Description

technical field [0001] The invention relates to a method for modifying an all-solid polyelectrolyte diaphragm, in particular to a method for modifying a polyalkylene oxide-polyphenylene ether copolymer all-solid polyelectrolyte diaphragm by using surface-modified titanium oxide nanoparticles. The invention belongs to the technical field of solid polyelectrolyte diaphragm. [0002] technical background [0003] Electrolyte is an important part of lithium-ion batteries. Organic substances are often used as electrolytes in traditional lithium-ion batteries. Lithium dendrites are generated during use of lithium-ion batteries, which poses a risk of explosion. Therefore, improving its conductivity and service life under the premise of ensuring its safety performance is the main direction of the development of lithium-ion battery technology. Replacing the electrolyte with a solid polyelectrolyte separator is an effective way to solve the safety problem of lithium-ion batteries, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565B82Y30/00
CPCH01M10/058H01M10/0565B82Y30/00H01M2300/0088Y02P70/50Y02E60/10
Inventor 郭红霞秦周阳程一辰李明晔王子莹刘孟茜秦振平李钒
Owner BEIJING UNIV OF TECH
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