Organic/inorganic composite solid electrolyte with bicontinuous structure and preparation method thereof

A solid electrolyte, inorganic composite technology, applied in composite electrolyte, electrolyte battery manufacturing, electrolyte and other directions, can solve the problems of complex preparation process, electrochemical performance to be optimized, etc., to achieve simple preparation method, precise control of electrochemical performance, easy effect achieved

Active Publication Date: 2020-11-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The room temperature ionic conductivities of these two methods are all in the range of 10 -4 About S / cm, the electrochemical performance still needs to be optimized, and the preparation process is relatively complicated

Method used

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  • Organic/inorganic composite solid electrolyte with bicontinuous structure and preparation method thereof
  • Organic/inorganic composite solid electrolyte with bicontinuous structure and preparation method thereof
  • Organic/inorganic composite solid electrolyte with bicontinuous structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] An organic / inorganic composite solid electrolyte with a bicontinuous structure, the preparation method of which is as follows:

[0037] 1) According to the chemical formula Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 In the molar ratio of elements, weigh 5.7864g lithium carbonate, 10.8728g lanthanum oxide, 2.9494g tantalum oxide and 3.8379g zirconia to form LLZO precursor powder, add PMMA and MgO to the precursor powder, PMMA accounts for LLZO precursor powder, PMMA and 25wt% of the total mass of MgO, MgO accounts for 0.5wt% of the LLZO precursor powder, then adds PVA aqueous solution (mass concentration is 10%) to the mixed powder, the PVA aqueous solution accounts for 10wt% of the mixed powder gross mass, and the resulting mixture is ground for 100min Finally, 0.6 g of the ground mixture was taken for tableting (tablet diameter 10 mm), placed in a zirconia crucible, placed in a Nabertherm muffle furnace, and heated to 1000 °C at a heating rate of 1 °C / min at room temperature. ...

Embodiment 2

[0040] An organic / inorganic composite solid electrolyte with a bicontinuous structure, the preparation method of which is as follows:

[0041] 1) According to the chemical formula Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Medium element molar ratio Weigh 2.34g lithium oxide, 10.8728g lanthanum oxide, 2.9494g tantalum oxide and 3.8379g zirconia to form LLZO precursor powder, add PMMA and MgO to the precursor powder, PMMA accounts for LLZO precursor powder, PMMA and 15wt% of the total mass of MgO, MgO accounts for 0.5wt% of the LLZO precursor powder, then adds PVA aqueous solution (mass concentration is 10%) in the mixed powder, the PVA aqueous solution accounts for 10wt% of the total mass of the mixed powder, and the resulting mixture is ground for 10min Finally, 0.6 g of the ground mixture was taken for tableting (10 mm in diameter), placed in a zirconia crucible, placed in a Nabertherm muffle furnace, and heated to 1100 °C at a heating rate of 3 °C / min at room temperature Carry out...

Embodiment 3

[0047] An organic / inorganic composite solid electrolyte with a bicontinuous structure, the preparation method of which is as follows:

[0048] 1) According to the chemical formula Li 6.4 Ga 0.2 La 3 Zr 2 o 12 Medium element molar ratio Weigh 1.8365g lithium oxide, 8.5333g lanthanum oxide, 0.3273g gallium oxide and 4.303g zirconia to form LLZO precursor powder, add PMMA and MgO to the precursor powder, PMMA accounts for LLZO precursor powder, PMMA and 5wt% of the total mass of MgO, MgO accounts for 1wt% of the LLZO precursor powder, then adds PVA aqueous solution (mass concentration is 10%) in the mixed powder, the PVA aqueous solution accounts for 10wt% of the mixed powder gross mass, after the gained mixture is ground for 45min , take 0.6g of the ground mixture and press it into tablets (10mm in diameter), put it in a zirconia crucible, put it in a Nabertherm muffle furnace, and heat it up to 800°C at a heating rate of 3°C / min at room temperature. Sintering, the sinterin...

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Abstract

The invention provides an organic/inorganic composite solid electrolyte with a bicontinuous structure and a preparation method thereof. The solid electrolyte comprises a three-dimensional porous LLZOframework material, an organic material and a lithium salt, wherein continuous through pores are uniformly distributed in the three-dimensional porous LLZO framework material, and the organic materialand the lithium salt are uniformly mixed and fully fill the pores in the three-dimensional porous LLZO framework material. According to the composite solid electrolyte prepared by the invention, thethree-dimensional porous LLZO is used as a framework material, and pores of the framework material are filled with the organic material and the lithium salt with relatively good ion conductivity, so that a bicontinuous ion conduction path is provided for lithium ions, and very high room-temperature ion conductivity (up to 1.33 * 10 <-3 > S/cm) is achieved.

Description

technical field [0001] The invention belongs to the field of all solid-state batteries, in particular to an organic / inorganic composite solid electrolyte with a bicontinuous structure and a preparation method thereof. [0002] technical background [0003] Lithium-ion batteries using liquid electrolytes have insurmountable shortcomings in terms of life and safety. In comparison, the solid electrolyte has high mechanical strength, which can effectively inhibit the dendrite penetration of the lithium negative electrode, thereby avoiding short circuit, and also has good safety at high temperature, which can fundamentally solve the problem of liquid electrolyte. question. [0004] Currently, two types of solid electrolytes, polymer electrolytes and ceramic electrolytes, are showing great potential. The former benefits from the flexibility and elasticity of the polymer material, which can better wet the electrodes. But its own low room temperature ionic conductivity (10 -7 ~10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/058
CPCH01M10/0562H01M10/0565H01M10/058H01M2300/0091H01M2300/0088Y02E60/10Y02P70/50
Inventor 陈斐夏子雯宋尚斌曹诗雨沈强
Owner WUHAN UNIV OF TECH
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