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Quasi-solid state lithium ion conductive electrolyte and preparation method and application thereof

A lithium-ion, quasi-solid-state technology, applied in the field of new lithium battery solid-state electrolytes, 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: 2018-09-28
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 lithium ion conductive electrolyte and preparation method and application thereof
  • Quasi-solid state lithium ion conductive electrolyte and preparation method and application thereof
  • Quasi-solid state lithium ion conductive electrolyte and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0064] The ceramic electrolyte was prepared by the sol-gel method, 3.27 grams of zirconium n-propoxide was dissolved in 0.71 grams of ethyl acetoacetate, and the solution A was obtained by thorough stirring; 2.41 grams of LiNO 3 and 6.49 g La(NO 3 ) 3 ·6H 2 O was dissolved in 7.53 g of absolute ethanol to obtain solution B; solution B was added to solution A, and stirred at 40 ° C for 2 hours to obtain a gel; the above gel was freeze-dried to obtain a precursor, and then the precursor Roasting under the atmosphere, the heating rate is 2°C / min, the firing temperature is 600°C, and the firing time is 8 hours, then the powder obtained by firing is pressed at 10MPa, and the ceramic electrolyte is obtained by repeated firing with the above firing process; Vinyl fluoride-hexafluoropropylene and 0.8 g of polypropylene carbonate were placed in 50 mL of methylpyrrolidone, stirred thoroughly at 80 ° C to obtain a homogeneous solution, and then 0.32 g of ceramic electrolyte and 0.32 g ...

Embodiment 2

[0080] The ceramic electrolyte was prepared by the sol-gel method, 3.22 grams of zirconium n-propoxide was dissolved in 0.71 grams of ethyl acetoacetate, and the solution A was obtained by thorough stirring; 2.41 grams of LiNO 3 and 6.33 g La(NO 3 ) 3 ·6H 2 O was dissolved in 7.53 g of absolute ethanol to obtain solution B; solution B was added to solution A, and stirred at 40 ° C for 2 hours to obtain a gel; the above gel was freeze-dried to obtain a precursor, and then the precursor Roasting under the atmosphere, the heating rate is 2°C / min, the firing temperature is 650°C, and the firing time is 6 hours, then the powder obtained by firing is pressed at 10MPa, and the ceramic electrolyte is obtained by repeated firing with the above firing process; 1.12 grams of poly Vinyl fluoride-hexafluoropropylene and 0.48 g of polypropylene carbonate were placed in 50 mL of methylpyrrolidone, stirred thoroughly at 80 ° C to obtain a homogeneous solution, and then 0.32 g of ceramic ele...

Embodiment 3

[0084] The ceramic electrolyte was prepared by the sol-gel method, and 3.32 g of zirconium n-propoxide was dissolved in 0.71 g of ethyl acetoacetate, and the solution A was obtained by thorough stirring; 2.41 g of LiNO 3 and 6.65 g La(NO 3 ) 3 ·6H 2 O was dissolved in 7.53 g of absolute ethanol to obtain solution B; solution B was added to solution A, and stirred at 40 ° C for 2 hours to obtain a gel; the above gel was freeze-dried to obtain a precursor, and then the precursor Roasting under the atmosphere, the heating rate is 2°C / min, the firing temperature is 550°C, and the firing time is 12 hours, then the powder obtained by firing is pressed at 10MPa, and the ceramic electrolyte is obtained by repeated firing with the above firing process; Vinyl fluoride-hexafluoropropylene and 1.12 grams of polypropylene carbonate were placed in 50 mL of methylpyrrolidone, stirred thoroughly at 80 ° C to obtain a homogeneous solution, and then 0.32 grams of ceramic electrolyte and 0.32 ...

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Abstract

The invention discloses a quasi-solid state lithium ion conductive electrolyte. The raw material comprises a polymer, a ceramic electrolyte, a lithium salt and an ionic liquid, wherein the polymer comprises polyvinylidene fluoride-hexafluoropropylene and polypropylene carbonate, the ceramic electrolyte comprises a main phase lanthanum-lithium-zirconium-oxygen and an impurity phase La2Zr2O7, and the ionic liquid is a fluorine-containing imidazolium ionic liquid. The invention discloses the quasi-solid state lithium ion conductive electrolyte. The quasi-solid state lithium ion conductive electrolyte has high mechanical strength, is compatible with flexibility, has high room-temperature lithium ion conductivity and high chemical / electrochemical stability with a metal lithium negative electrode and an oxide positive electrode, and favorable electrochemical performance can be achieved when the quasi-solid state lithium ion conductive electrolyte is used for a metal lithium battery, a lithium-air battery and a lithium-sulfur battery.

Description

technical field [0001] The invention relates to the field of novel lithium battery solid electrolytes, in particular to a quasi-solid lithium ion conductive 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. B...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0091Y02E60/10
Inventor 赵新兵孙秋实朱崇佳曹高劭谢健
Owner ZHEJIANG UNIV
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