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

An electrolyte, quasi-solid-state technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of interface stability and affect the cycle stability of lithium anodes, and achieve excellent mechanical properties and chemical/electrochemical properties.

Active Publication Date: 2018-08-03
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 electrolyte as well as preparation method and application thereof
  • Quasi-solid electrolyte as well as preparation method and application thereof
  • Quasi-solid electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The ceramic electrolyte was prepared by the sol-gel method. 19.6mL of 25% ammonia water was added dropwise to 10mL of tetraisopropyl titanate, and a precipitate was obtained after magnetic stirring for 1 hour. The precipitate was filtered and dispersed in 40mL of deionized water. Stir evenly, then add 80 mL of oxalic acid with a concentration of 1 mol / L, and stir well until the precipitate is completely dissolved to obtain solution A; 1.832 g of LiNO 3 , 2.212 grams of Al(NO 3 ) 3 9H 2 O, 7.751 g (NH 4 ) 2 HPO 4 Add it into the above-mentioned solution A in the step, and obtain solution B after thorough stirring; dissolve 6 grams of cetyltrimethylammonium bromide in 40 mL of absolute ethanol, and stir at 40°C for 2 hours to obtain solution C; Add C to solution B, stir well at 80°C to obtain a colloidal precursor, then place the precursor in a tube furnace, raise the temperature to 650°C in an air atmosphere at a rate of 2°C / min, and heat it under argon Roasting in...

Embodiment 2

[0082] The ceramic electrolyte was prepared by the sol-gel method. 19.6mL of 25% ammonia water was added dropwise to 10mL of tetraisopropyl titanate, and a precipitate was obtained after magnetic stirring for 1 hour. The precipitate was filtered and dispersed in 40mL of deionized water. Stir evenly, then add 80 mL of oxalic acid with a concentration of 1 mol / L, and stir well until the precipitate is completely dissolved to obtain solution A; 1.761 g of LiNO 3 , 2.581 grams of Al(NO 3 ) 3 9H 2 O, 7.751 g (NH 4 ) 2 HPO 4 Add it to the above solution in the step, and stir to obtain solution B; dissolve 6 grams of cetyltrimethylammonium bromide in 40 mL of absolute ethanol, and stir at 40°C for 2 hours to obtain solution C; Add it into solution B, stir well at 80°C to obtain a colloidal precursor, then place the precursor in a tube furnace, raise the temperature to 600°C in an air atmosphere at a rate of 2°C / min, and heat it under an argon atmosphere The ceramic electrolyte ...

Embodiment 3

[0086] The ceramic electrolyte was prepared by the sol-gel method. 19.6mL of 25% ammonia water was added dropwise to 10mL of tetraisopropyl titanate, and a precipitate was obtained after magnetic stirring for 1 hour. The precipitate was filtered and dispersed in 40mL of deionized water. Stir evenly, then add 80 mL of oxalic acid with a concentration of 1 mol / L, and stir well until the precipitate is completely dissolved to obtain solution A; 1.902 g of LiNO 3 , 1.843 g Al(NO 3 ) 3 ·6H 2 O, 7.751 g (NH 4 ) 2 HPO 4 Add it to the above solution in the step, and stir to obtain solution B; dissolve 6 grams of cetyltrimethylammonium bromide in 40 mL of absolute ethanol, and stir at 40°C for 2 hours to obtain solution C; Add it into solution B, stir well at 80°C to obtain a colloidal precursor, then place the precursor in a tube furnace, raise the temperature to 550°C in an air atmosphere at a rate of 2°C / min, and heat it under an argon atmosphere The ceramic electrolyte was ob...

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Abstract

The invention discloses a quasi-solid electrolyte which is prepared from the following raw materials including a polymer, a ceramic electrolyte, lithium salt and ionic liquid; the polymer is preparedfrom polyvinylidene fluoride-hexafluoropropylene and polypropylene carbonate; the ceramic electrolyte is prepared from a principal-phase lithium titanium aluminum phosphate and impurity-phase TiP2O7 / TiO2; and the ionic liquid is fluorine-containing imidazolium ionic liquid. The invention also discloses the quasi-solid electrolyte which has high mechanical strength and 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 cell, a lithium air cell 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 electrolytes, in particular to a quasi-solid electrolyte 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 replacing the liquid ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562
CPCH01M10/0562H01M2300/0068Y02E60/10
Inventor 谢健朱崇佳孙秋实曹高劭赵新兵
Owner ZHEJIANG UNIV
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