Preparation method of high-voltage-resistant solid polymer electrolyte

A solid polymer and electrolyte technology, applied in solid electrolytes, electrolytes, non-aqueous electrolytes, etc., can solve the problems of solid electrolytes that cannot work at room temperature, low room temperature ionic conductivity, and vaporization of organic electrolytes, so as to improve energy density and Safety, high cycle capacity, and low production cost

Active Publication Date: 2019-02-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Samsung note7 spontaneously ignited, and Tesla caught fire. The reason was that the battery overheated, which caused the organic electrolyte to vaporize and the battery to bulge, which eventually caused the electrolyte to leak and cause a fire accident.
Although solid polymer electrolytes have obvious advantages, there are also problems such as low room temperature ionic conductivity and low electrochemical window.
This makes the existing solid electrolytes unable to maintain room temperature work, and secondly cannot match high voltage, high capacity ternary positive electrodes

Method used

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  • Preparation method of high-voltage-resistant solid polymer electrolyte
  • Preparation method of high-voltage-resistant solid polymer electrolyte
  • Preparation method of high-voltage-resistant solid polymer electrolyte

Examples

Experimental program
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Embodiment 1

[0030] Dissolve zinc oxide and boric acid in water at a molar ratio of 1:3, stir, dry, and place in a 1000°C muffle furnace for calcination for 10 minutes. After the muffle furnace is cooled, the sample is taken out, washed, filtered, and dried to obtain the desired zinc borate nanoparticles.

[0031] Dissolve PEO and LiTFSI in an appropriate amount of anhydrous acetonitrile solution at a mass ratio of EO:Li=20:1, and stir to mix them evenly. Zinc borate nanoparticles were added to the mixed solution as zinc borate accounted for 10% of the total mass of PEO and LiTFSI, and vigorously stirred for 48 hours to make it evenly mixed. Among them, the use of LiTFSI must control the water and oxygen content in its environment to be less than 10ppm to prevent the decomposition of salt. The mixed solution was poured into a polytetrafluoroethylene mold and volatilized at 50°C for 24 hours to obtain a solid polymer electrolyte membrane with a certain thickness, which was cut into small d...

Embodiment 2

[0038] Dissolve aluminum nitrate, boric acid, ammonium nitrate, and citric acid in a small amount of water in a molar ratio of 1:1:5:1.4, mix well, and place in a muffle furnace at 1000°C for calcination for 6 minutes. After the muffle furnace is cooled, the sample is taken out, washed, filtered, and dried to obtain the desired aluminum borate nanowhiskers.

[0039]Dissolve PEO and LiTFSI in an appropriate amount of anhydrous acetonitrile solution at a mass ratio of EO:Li=15:1, and stir to mix them evenly. Add aluminum borate nano-whiskers to the mixed solution according to the fact that aluminum borate accounts for 10% of the total mass of PEO and LiTFSI, and stir vigorously for 48 hours to make it evenly mixed. Among them, the use of LiTFSI must control the water and oxygen content in its environment to be less than 10ppm to prevent the decomposition of salt. The mixed solution was poured into a polytetrafluoroethylene mold and volatilized at 50°C for 48 hours to obtain a s...

Embodiment 3

[0046] Calcium chloride and borax were dissolved in water at a molar ratio of 1:2, stirred, dried, and calcined in a muffle furnace at 850°C for 2 hours. After the muffle furnace is cooled, the sample is taken out, washed, filtered, and dried to obtain the desired calcium borate nanowires.

[0047] Dissolve PEO and LiTFSI in an appropriate amount of anhydrous acetonitrile solution at a mass ratio of EO:Li=10:1, and stir to make them evenly mixed. Calcium borate nanowires were added to the mixed solution as calcium borate accounted for 5% of the total mass of PEO and LiTFSI, and vigorously stirred for 24 hours to make it evenly mixed. Among them, the use of LiTFSI must control the water and oxygen content in its environment to be less than 10ppm to prevent the decomposition of salt. The mixed solution was poured into a polytetrafluoroethylene mold and volatilized at 55°C for 48 hours to obtain a solid polymer electrolyte membrane with a certain thickness, which was cut into sm...

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Abstract

A preparation method of a high-voltage-resistant solid polymer electrolyte includes the steps of: 1) according to certain ratio, dissolving a polymer substrate, lithium salt, and an inorganic additivein anhydrous acetonitrile and stirring the mixture at room temperature to obtain a uniform solution, wherein the polymer substrate is polyoxyethylene, the lithium salt is lithium bistrifluoromethylsulfonimide or lithium perchlorate; the inorganic additive is nano-wires or nano-particles of zinc borate, aluminum borate, sodium tetraborate, barium metaborate or calcium borate, the mass ratio of thepolyoxyethylene to the lithium salt EO : Li<+> is 10-20:1, and the mass of the inorganic additive is not more than 20% of the total mass of the polymer substrate and lithium salt; 2) pouring the solution into a polytetrafluoroethylene mold to volatilize the solution until completely dried, thus preparing the solid polymer electrolyte. The method improves the high-voltage resistance of the solid polymer electrolyte, so that the product fits a high-voltage ternary cathode material and energy density and safety of an all-solid-state battery are improved.

Description

(1) Technical field [0001] The invention belongs to the technical field of solid-state lithium batteries, and relates to a preparation method of a high-voltage-resistant solid polymer electrolyte. (2) Background technology [0002] The Samsung note7 spontaneously ignited, and the Tesla car caught fire. The reason was that the battery overheated, causing the organic electrolyte to vaporize and the battery to bulge, which eventually led to the leakage of the electrolyte and caused a fire accident. Most of the current lithium-ion batteries also use flammable and explosive organic electrolytes, which makes electronic products such as mobile phones, computers, tablets, and electric vehicles a great safety hazard, which does not satisfy people's expectations for the safety of electronic products usage requirements. Therefore, we need to research and produce solid polymer electrolytes with higher safety. The solid polymer electrolyte is equivalent to the electrolyte and diaphragm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082H01M2300/0091Y02E60/10
Inventor 陶新永盛欧微金成滨罗剑敏袁华栋居治金陈媚
Owner ZHEJIANG UNIV OF TECH
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