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Quasi-solid-state electrolyte film as well as preparation method and application thereof

An electrolyte film, quasi-solid-state technology, applied in solid electrolytes, electrolyte battery manufacturing, electrolytes, etc., can solve the problems of interface stability and affect the cycle stability of lithium anode, so as to improve interface stability and improve lithium ion conductivity. and excellent effects on migration number, mechanical properties and chemical/electrochemical properties

Active Publication Date: 2018-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is an interface stability problem between the ceramic electrolyte and lithium metal, and there is also an interface stability problem between the liquid electrolyte and lithium metal, which affects the cycle stability of the lithium negative electrode.

Method used

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  • Quasi-solid-state electrolyte film as well as preparation method and application thereof
  • Quasi-solid-state electrolyte film as well as preparation method and application thereof
  • Quasi-solid-state electrolyte film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Under Ar atmosphere, 0.2123 g of Li 2 S, 0.16 g P 2 S 5 , 0.1605 g SiS 2 and 0.0127 g of LiCl were added to a container containing 10 mL of anhydrous acetonitrile, then the container was sealed, stirred magnetically for 24 h, and then left to stand for 2 h, and the supernatant was removed with a dropper to leave a white mixture, which was placed under an argon atmosphere at room temperature Evaporate and dry under reduced pressure, then grind it into powder with a mortar, put it into a quartz tube, seal the tube in vacuum, then place the sample in a tube furnace at 475°C, react for 11h, the heating rate is 5°C / min, and cool with the furnace , to obtain a ceramic electrolyte; 0.8 g of polyvinylidene fluoride-hexafluoropropylene and 0.8 g of polypropylene carbonate were placed in 50 mL of methyl pyrrolidone, and stirred at 80 ° C to obtain a uniform solution, and then 0.32 g of ceramic electrolyte and 0.32 Two grams of bistrifluoromethanesulfonylimide lithium is disper...

Embodiment 2

[0071] Under Ar atmosphere, 0.2123 g of Li 2 S, 0.1540 g P 2 S 5 , 0.1605 g SiS 2and 0.0116 g of LiCl were added to a container containing 10 mL of anhydrous acetonitrile, then the container was sealed, stirred by magnetic force for 24 h, and then left to stand for 2 h, and the supernatant liquid was removed with a dropper, leaving a white mixture, which was placed under an argon atmosphere at room temperature Evaporate and dry under reduced pressure, then grind it into powder with a mortar, put it into a quartz tube, vacuum seal the tube, then place the sample in a tube furnace at 500°C, react for 9h, the heating rate is 5°C / min, and cool with the furnace , to obtain a ceramic electrolyte; 1.12 grams of polyvinylidene fluoride-hexafluoropropylene and 0.48 grams of polypropylene carbonate were placed in 50 mL of methyl pyrrolidone, and stirred at 80 ° C to obtain a uniform solution, and then 0.32 grams of ceramic electrolyte and 0.32 Two grams of bistrifluoromethanesulfonyl...

Embodiment 3

[0074] Under Ar atmosphere, 0.2123 g of Li 2 S, 0.1623 g P 2 S 5 , 0.1605 g SiS 2 and 0.0130 g of LiCl were added to a container containing 10 mL of anhydrous acetonitrile, then the container was sealed, stirred by magnetic force for 24 h, and then left to stand for 2 h, and the supernatant liquid was removed with a dropper to leave a white mixture, which was placed under an argon atmosphere at room temperature Evaporate and dry under reduced pressure, then grind to powder with a mortar, put it into a quartz tube, vacuum seal the tube, then place the sample in a tube furnace at 450°C, react for 13h, the heating rate is 5°C / min, and cool with the furnace , to obtain a ceramic electrolyte; 0.48 grams of polyvinylidene fluoride-hexafluoropropylene and 1.12 grams of polypropylene carbonate were placed in 50 mL of methyl pyrrolidone, and stirred at 80 ° C to obtain a uniform solution, and then 0.32 grams of ceramic electrolyte and 0.32 Two grams of bistrifluoromethanesulfonylimi...

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Abstract

The invention discloses a quasi-solid-state electrolyte film which is prepared from the following raw materials including polymer, ceramic electrolyte, lithium salt and ionic liquid; the polymer comprises polyvinylidene fluoride-hexafluoropropylene and poly(propylene oxide carbonate); the ceramic electrolyte comprises a main-phase thio LISICON type compound and impurity phase Li3PS4; and the ionicliquid is fluorine-containing imidazole ionic liquid. The invention discloses the quasi-solid-state electrolyte film which has high mechanical strength, toughness, high room-temperature lithium ion conductivity and high chemical / electrochemical stability with a metal lithium negative electrode and an oxide positive electrode, is used for a metal lithium battery, a lithium air battery and a lithium-sulfur battery and can realize good electrochemical performance.

Description

technical field [0001] The invention relates to the field of novel lithium battery solid-state electrolytes, in particular to a quasi-solid-state electrolyte film and a preparation method and application thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for the energy density of power batteries are getting higher and higher, while the energy density of traditional lithium-ion batteries is close to the bottleneck value, and the development of new lithium battery systems has become an urgent need. Substituting metal lithium for the graphite negative electrode of a lithium-ion battery can significantly increase the energy density of the battery and reduce the volume of the battery. However, lithium metal has poor compatibility with liquid electrolytes, and lithium metal is prone to form dendrites during repeated charging and discharging, which can easily pierce the separator and cause safety problems. By repl...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/056H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 谢健朱崇佳孙秋实曹高劭赵新兵
Owner ZHEJIANG UNIV
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