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Preparation and application of organic-inorganic composite solid electrolyte

A solid electrolyte, inorganic composite technology, used in circuits, electrical components, secondary batteries, etc., can solve the problems of inability to meet the use of high-voltage cathode materials, poor cycle performance, low ionic conductivity, etc., and achieve excellent ion transport capacity and thermal conductivity. Effects of stable performance, improved charge and discharge performance, and high ionic conductivity

Pending Publication Date: 2022-08-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte exhibits good mechanical properties and stability to metal lithium, but its ionic conductivity is much lower than that of liquid electrolytes, and its electrochemical window is low, which cannot meet the use of high-voltage cathode materials.
[0004] In all-solid-state batteries, due to the low ionic conductivity of the electrolyte, narrow electrochemical window, and serious interface problems between the electrolyte and electrode materials, all-solid-state batteries cannot match high-voltage positive electrode materials, and the cycle performance is poor. Poor, the power density of the battery is low, and its application is limited to a certain extent

Method used

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  • Preparation and application of organic-inorganic composite solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix and stir ethylene ethylene carbonate (VEC) and lithium bistrifluoromethanesulfonimide (LiTFSI) in a ratio of 7.69:2.31 to obtain solution A, and stir at room temperature to completely dissolve; according to the quality of the solution, add solution A Azobisisobutyronitrile with a mass of 0.5-1‰ was uniformly stirred for 2h. Then hydroxyl-rich functionalized nanosilica (SiO 2): (Solution A)=0.5:9.5 ratio, stir at room temperature for 1h, then ultrasonic for 2h, continue to stir for 4h, make it fully combined to produce intermolecular interaction, on the polytetrafluoroethylene mold, use whatman glass fiber membrane For the porous support framework, the uniformly stirred mixture was scraped onto both sides of the whatman film; heated in a vacuum drying oven at 80°C for 10 hours to cure to form a film.

Embodiment 2

[0031] Mix ethylene ethylene carbonate and lithium bistrifluoromethanesulfonimide (LiTFSI) in a ratio of 7.69:2.31 with stirring B, add N-methylpyrrolidone (NMP) with a mass of 50% of the mixture and stir at room temperature to completely dissolve it ; According to the quality of solution B, add azobisisobutyronitrile with a mass of 0.5-1‰ and stir evenly for 2h. Then add functionalized nano-alumina: (solution B) = 0.5:9.5 ratio to mix, stir for 1h, then sonicate for 2h, continue to stir for 4h, make it fully react to generate intermolecular interaction, in the polytetrafluoroethylene mold Using whatman glass fiber membrane as the porous support skeleton, the evenly stirred mixture was scraped onto both sides of the whatman membrane; heated in a vacuum drying oven at 80°C for 10 hours to cure to form a membrane.

Embodiment 3

[0033] Dissolve ethylene ethylene carbonate and lithium bistrifluoromethanesulfonimide (LiTFSI) in a ratio of 7.69:2.31, mix and stir C, add a certain amount of N-methylpyrrolidone (NMP) and stir at room temperature to make it completely dissolved; According to the quality of solution C, azobisisobutyronitrile with a mass of 0.5-1‰ was added and stirred uniformly for 2h. Then the nanosized (solid electrolyte Li 6.4 Ga 0.2 La 3 Zr 2 O 12 ):(Solution C)=0.5:9.5 ratio, stir for 1h, then sonicate for 2h, continue to stir for 4h, make it fully react to produce intermolecular interaction, on the polytetrafluoroethylene mold, with whatman membrane as porous support The skeleton, the evenly stirred mixture was scraped onto both sides of the whatman film; heated in a vacuum drying oven at 80°C for 10 hours to cure to form a film.

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Abstract

The invention discloses preparation and application of an organic-inorganic composite solid electrolyte, and belongs to the technical field of lithium ion battery electrolytes. The organic-inorganic composite solid electrolyte is prepared by compounding a carbonate-based polymer, a conductive lithium salt, a porous support material and functional inorganic nanoparticles. The polycarbonate-based polymer electrolyte has high ionic conductivity and excellent mechanical properties; the functionalized inorganic nanoparticles can improve the ion transference number of the polymer electrolyte and broaden the electrochemical window of the polymer electrolyte through the intermolecular interaction, and improve the interface contact between the solid electrolyte and the positive and negative electrodes, thereby improving the charge and discharge performance of the lithium ion battery. The thickness of the composite solid electrolyte is 5-500 microns; the material has the advantages of excellent interface stability, wide electrochemical window (greater than 5.5 V), wide working temperature range (-20 to 50 DEG C) and high ionic conductivity (greater than 1 * 10 <-3 > S / cm); the method is suitable for a lithium ion solid-state battery of a high-voltage positive electrode material.

Description

technical field [0001] The invention relates to a lithium ion battery solid electrolyte, in particular to the preparation and application of an organic-inorganic composite solid electrolyte, and belongs to the technical field of lithium ion battery electrolytes. Background technique [0002] Lithium-ion batteries are widely used energy storage devices because of their high energy density and good reliability. So far, commercial lithium-ion batteries mostly use conventional organic liquid electrolytes, such as ethylene carbonate and propylene carbonate. However, lithium-ion batteries using organic liquid electrolytes have huge safety problems, which seriously hinder the further popularization and wider application of lithium-ion batteries. The main reason is that organic electrolytes usually have high chemical activity, volatility, and fire , easy to explode and other safety defects. Therefore, the use of solid-state electrolytes instead of traditional organic electrolytes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M2300/0088H01M2300/0065Y02P70/50
Inventor 尉海军王永涛吴玲巧郭现伟
Owner BEIJING UNIV OF TECH
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