A kind of composite polymer solid electrolyte, solid lithium battery and preparation method thereof

A solid electrolyte and composite polymer technology, applied in solid electrolyte, non-aqueous electrolyte battery, lithium battery, etc., can solve the problems of unfavorable composite polymer solid electrolyte performance, uneven distribution, particle agglomeration, etc., to improve lithium ion conductivity The effect of high efficiency and migration number, low preparation energy consumption, and not easy to agglomerate

Active Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation of inorganic ceramic fillers mainly adopts the method of sol-gel to form colloids and then calcined, or directly adopts solid-phase synthesis technology. These preparation methods are complicated and consume a lot of energy, especially during the calcining process. Agglomeration occurs to form large particles, which will cause uneven distribution during the compounding process, which is not conducive to the further improvement of the performance of the composite polymer solid electrolyte

Method used

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  • A kind of composite polymer solid electrolyte, solid lithium battery and preparation method thereof
  • A kind of composite polymer solid electrolyte, solid lithium battery and preparation method thereof
  • A kind of composite polymer solid electrolyte, solid lithium battery and preparation method thereof

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Embodiment 1

[0058] The metal-organic framework structure that adsorbs lithium-containing ionic liquid: the preparation of a composite solid electrolyte of (PEO+LiTFSI)=1:4 and the corresponding solid-state lithium battery prepared from the electrolyte, the specific steps are as follows:

[0059] Take 0.15g of the activated metal-organic framework and 0.24g of the lithium-ion-containing liquid, grind and mix them in a mortar, and heat at 120°C for 24 hours in a vacuum to obtain a metal-organic framework that adsorbs the lithium-ion-containing liquid;

[0060] Disperse 0.1349g of the metal-organic framework structure that adsorbs lithium-containing ionic liquids in 6ml of anhydrous acetonitrile, then add 0.396g of PEO and 0.1435g of LiTFSI, heat to 60°C in a glove box, and stir for 24h to obtain a colloidal solution; Pour it on a polytetrafluoroethylene plate, and after the surface solvent is completely evaporated, dry it in vacuum at 60°C for 24 hours to obtain a composite polymer solid ele...

Embodiment 2

[0065] The metal-organic framework structure that adsorbs lithium-containing ionic liquid: (PEO+LiTFSI)=1:9 The preparation of the composite solid electrolyte, the specific steps are as follows:

[0066] Take 0.15g of the activated metal-organic framework and 0.15g of the lithium-ion-containing liquid, grind and mix them in a mortar, and heat at 110°C for 22 hours in a vacuum to obtain a metal-organic framework that adsorbs the lithium-ion-containing liquid;

[0067]Disperse 0.06g of the metal-organic framework structure for adsorbing lithium-containing ionic liquids in 6ml of anhydrous acetonitrile, then add 0.396g of PEO and 0.1435g of LiTFSI, heat to 60°C in a glove box, and stir for 24h to obtain a colloidal solution; Pour it on a polytetrafluoroethylene plate, and after the surface solvent is completely volatilized, dry it in vacuum at 70°C for 20 hours to obtain a composite polymer solid electrolyte with a conductivity of 0.049×10 -4 S / cm.

Embodiment 3

[0069] The metal-organic framework structure for adsorbing lithium-containing ionic liquid: (PEO+LiTFSI) = 3:7 preparation of composite solid electrolyte, the specific steps are as follows:

[0070] Take 0.15g of the activated metal-organic framework and 0.24g of the lithium-ion-containing liquid, grind and mix them in a mortar, and heat at 120°C for 24 hours under vacuum to obtain a metal-organic framework that adsorbs the lithium-ion-containing liquid;

[0071] Disperse 0.2314g of the metal-organic framework structure that adsorbs lithium-containing ionic liquids in 6ml of anhydrous acetonitrile, then add 0.396g of PEO and 0.1435g of LiTFSI, heat to 60°C in a glove box, and stir for 24h to obtain a colloidal solution; Pour it on a polytetrafluoroethylene plate, and after the surface solvent is completely volatilized, dry it in vacuum at 60°C for 24 hours to obtain a composite polymer solid electrolyte with a conductivity of 0.68×10 -4 S / cm.

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Abstract

The invention belongs to the field of solid-state lithium batteries, and specifically discloses a composite polymer solid electrolyte, a solid-state lithium battery and a preparation method thereof, which uses a novel nanostructured metal-organic framework structure filler to prepare a composite polymer solid based on PEO polymer Electrolyte, and using the composite polymer solid electrolyte to prepare a solid-state lithium battery has the advantages of simple preparation, energy saving, strong applicability, etc. The prepared composite polymer solid electrolyte has high conductivity, and the solid-state lithium battery has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of solid-state lithium batteries, and more specifically relates to a composite polymer solid electrolyte, a solid-state lithium battery and a preparation method thereof. Background technique [0002] Polyethylene oxide (PEO, polyethylene oxide) is an amorphous macromolecular polyether. Since its discovery in the 1970s, PEO has become one of the most widely studied polymer materials. PEO is capable of dissolving lithium salts without the addition of solvents, thus serving as a polymer lithium-ion solid electrolyte. In the polymer matrix, the O atoms in PEO can interact with Li + Ions share electrons to form coordination bonds, the rotation barrier of Li-O chemical bonds is low, and the movement of polymer chain segments is easy. Therefore, the conductivity of the material can reach 10 -7 S / cm~10 -6 S / cm. However, PEO is easier to crystallize, and the migration of lithium ions in the crystallization region is hinde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 吴剑芳郭新汪其
Owner HUAZHONG UNIV OF SCI & TECH
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