Composite solid electrolyte and preparation method thereof

A solid electrolyte and electrolyte technology, applied in non-aqueous electrolyte batteries, circuits, electrical components, etc., can solve the problems of poor wettability, easy breakage, fracture, and high interface impedance

Inactive Publication Date: 2019-05-21
杭州阳名新能源设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after replacing the organic electrolyte with an inorganic solid electrolyte, the solid-liquid interface of the electrode material/electrolyte in the lithium battery system is also replaced by the solid-solid interface of the electrode material/solid electrolyte, and the wettability between the solid-solid interface is extreme

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  • Composite solid electrolyte and preparation method thereof
  • Composite solid electrolyte and preparation method thereof
  • Composite solid electrolyte and preparation method thereof

Examples

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Example Embodiment

[0046] The invention provides a composite solid electrolyte and a preparation method thereof. Firstly, a porous inorganic solid electrolyte ceramic green film is prepared and sintered to obtain a porous inorganic solid electrolyte frame with particles or fibers interconnected and connected; then a polymer-based solid electrolyte The mixed solution is absorbed into the porous inorganic solid electrolyte frame by vacuum; finally, the composite solid electrolyte is obtained by vacuum drying or in-situ polymerization to obtain the composite solid electrolyte. The specific steps are as follows:

[0047] S1. Preparation of porous inorganic solid electrolyte frame by scraper coating or template method;

[0048] S101. Preparation of porous inorganic electrolyte frame by doctor blade coating method

[0049] S1011. Mix the solid electrolyte precursor powder, pore former, dispersant, solvent, plasticizer and binder uniformly to obtain a mixed slurry; the method of mixing is not limited, and met...

Example Embodiment

[0067] Example 1

[0068] The Garnet solid electrolyte niobium-doped lithium lanthanum zirconium oxygen precursor is prepared by the sol-gel method. The required mass of lithium nitrate is weighed according to the stoichiometric ratio, and the lanthanum nitrate and zirconyl oxynitrate are slowly added to the deionized water; Slowly add a solution containing 2% niobium pentachloride, then add citric acid for evaporation to dryness to obtain a dry gel; finally, high temperature sintering to obtain a niobium-doped lithium lanthanum zirconium oxygen precursor.

[0069] 3 grams of niobium doped lithium lanthanum zirconium oxygen precursor, 0.2 grams of carbon balls, a few drops of triethanolamine and 9 grams of n-hexane / isopropanol azeotropic solvent, 0.8 grams of polyvinyl butyral and dibutyl phthalate The ester mixture was mixed and ball milled for 5 hours at a speed of 500 revolutions per minute to obtain a ball milled mixed slurry.

[0070] Use a coater to cast the resulting slurry o...

Example Embodiment

[0073] Example 2

[0074] First, use the sol-gel method to prepare the Garnet solid electrolyte niobium-doped lithium lanthanum zirconium-oxygen precursor, weigh the required mass of lithium nitrate according to the stoichiometric ratio, and slowly add lanthanum nitrate hexahydrate and zirconyl oxynitrate to deionized water ; Then slowly add a solution containing 2% niobium pentachloride, and then add citric acid for evaporation to obtain a dry gel; finally, high temperature sintering to obtain a niobium-doped lithium lanthanum zirconium oxygen precursor.

[0075] 3 grams of niobium doped lithium lanthanum zirconium oxygen precursor, 0.2 grams of carbon balls, a few drops of triethanolamine and 9 grams of n-hexane / isopropanol azeotropic solvent, 0.8 grams of polyvinyl butyral and dibutyl phthalate The ester mixture was mixed and ball milled for 4 hours at a speed of 500 revolutions per minute to obtain a ball milled mixed slurry.

[0076] Use a coater to cast the resulting slurry on...

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Abstract

The present invention discloses a composite solid electrolyte and a preparation method thereof. The composite solid electrolyte comprises an inorganic solid electrolyte and a polymer electrolyte. Theinorganic solid electrolyte is of a porous structure; the porosity of the inorganic solid electrolyte is less than 30%; and the inside of the inorganic solid electrolyte is provided with a continuouslithium ion channel composed of particles communicating with each other. The polymer electrolyte is arranged between the inorganic solid electrolytes for filling gaps, and account for less than 30% ofthe composite solid electrolyte. The porous inorganic solid electrolyte of the invention constitutes a main frame structure, which has a porosity below 30% and is the main bearer of lithium ion transportation. The polymer electrolyte is a gap filling material, which is mainly used for improving the overall flexibility of the composite solid electrolyte and reducing the impedance of the solid-solid contact interface between the positive electrode plate and negative electrode plate.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a composite solid electrolyte and a preparation method thereof. Background technique [0002] The use of solid electrolytes instead of liquid organic electrolytes to assemble solid-state lithium batteries is expected to essentially solve the safety problems of existing liquid lithium-ion batteries. At the same time, the solid-state electrolyte has a wider operating voltage window and better chemical compatibility with the electrode. After using the solid-state electrolyte, the lithium battery can use a positive electrode material with a higher operating voltage, and the negative electrode can directly use metal lithium. Therefore, the energy density of solid-state lithium batteries may reach 2 to 5 times that of existing lithium-ion batteries, and the cycle and service life are longer, making them a candidate technology for next-generation battery energy storage wi...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/052
CPCY02E60/10
Inventor 沈飞曾鼎元高捷孙周婷王凯铭蒋扬昶韩晓刚
Owner 杭州阳名新能源设备科技有限公司
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