A kind of preparation method of high pressure 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 The effect of safety, high cycle capacity, and low production cost

Active Publication Date: 2021-02-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • A kind of preparation method of high pressure resistant solid polymer electrolyte
  • A kind of preparation method of high pressure resistant solid polymer electrolyte
  • A kind of preparation method of high pressure resistant solid polymer electrolyte

Examples

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Embodiment 1

[0034] 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.

[0035] 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

[0042] Dissolve aluminum nitrate, boric acid, ammonium nitrate, and citric acid in a small amount of water at 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.

[0043]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

[0050] 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.

[0051] 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 solid polymer electrolyte, comprising: (1) dissolving a polymer matrix, a lithium salt, and an inorganic additive in anhydrous acetonitrile in a certain proportion, and stirring at room temperature to obtain a uniform solution; the polymer matrix It is polyethylene oxide, the lithium salt is lithium bistrifluoromethanesulfonimide or lithium perchlorate, and the inorganic additive is nanowire or nanoparticle, selected from zinc borate, aluminum borate, sodium tetraborate , barium metaborate or calcium borate; The mass ratio of the polyoxyethylene and lithium salt is EO:Li + =10-20:1, the mass consumption of described inorganic additive is no more than 20% of polymer matrix and lithium salt total mass; (2) the homogeneous solution of step (1) gained is poured in the polytetrafluoroethylene mould, evaporates Let it dry completely to obtain a solid polymer electrolyte. The preparation method of the invention improves the high-voltage resistance performance of the solid polymer electrolyte, enables it to match the high-voltage ternary positive electrode material, and improves the energy density and safety of the all-solid-state battery.

Description

[0001] (1) Technical field [0002] 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. [0003] (2) Background technology [0004] 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 electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(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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