Lithium lanthanum zirconium oxide solid electrolyte, preparation method thereof and lithium ion battery

A solid electrolyte, lithium lanthanum zirconium oxide technology, applied in secondary batteries, circuits, electrical components and other directions, can solve the problems of complex preparation methods, high cost, inability to have both electrochemical properties and mechanical properties, and achieve easy availability of raw materials. , low cost, the effect of optimizing interface compatibility and stability

Active Publication Date: 2019-05-28
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen that the existing composite solid electrolytes still have problems such as inability to have both electrochemical and mechanical properties, high cost and complicated preparation methods. Therefore, it is necessary to develop a new composite solid electrolyte and its preparation method

Method used

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  • Lithium lanthanum zirconium oxide solid electrolyte, preparation method thereof and lithium ion battery
  • Lithium lanthanum zirconium oxide solid electrolyte, preparation method thereof and lithium ion battery
  • Lithium lanthanum zirconium oxide solid electrolyte, preparation method thereof and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0035] The lithium lanthanum zirconium oxide solid electrolyte is composed of: 63.56wt% polymer, 10.24wt% lithium salt and 26.20wt% lithium lanthanum zirconium oxide three-dimensional porous inorganic network.

[0036] S1. Preparation of lithium lanthanum zirconium oxygen precursor solution: dissolve 0.9526g lithium nitrate, 2.598g lanthanum nitrate hexahydrate, 0.924g zirconyl nitrate, 0.18g aluminum nitrate nonahydrate in 25mL deionized water, stir at room temperature for 3 hours, get Li 6.28 La 3 Zr 2 al 0.24 o 12 The precursor solution;

[0037] S2, the area is 400cm 2 Dust-free paper cut into 5×5cm 2After that, completely immerse in the lithium lanthanum zirconium oxide precursor solution for 6 hours, and dry the template at 70°C after soaking;

[0038] S3, the dried 5 × 5cm 2 The dust-free paper was heat-treated in a muffle furnace at 850°C for 2 hours, and the heating rate was 5°C / min to obtain a three-dimensional porous inorganic network of lithium lanthanum zi...

Embodiment 2

[0048] The lithium lanthanum zirconium oxygen solid electrolyte is composed of: 75wt% polymer, 10wt% lithium salt and 15wt% lithium lanthanum zirconium oxide three-dimensional porous inorganic network.

[0049] The lithium lanthanum zirconium oxygen solid electrolyte was prepared according to the following steps:

[0050] S1. Preparation of lithium lanthanum zirconium oxygen precursor solution: dissolve 0.834g lithium nitrate, 2.598g lanthanum nitrate hexahydrate, 1.289g octahydrate zirconium oxychloride, 0.176g gallium trichloride in 25mL deionized water, stir at room temperature 3 hours, get Li 5.5 La 3 Zr 2 Ga 0.5 o 12 The precursor solution; the concentration of lithium nitrate is 33.36g / L; the concentration of lanthanum nitrate hexahydrate is 103.92g / L; the concentration of zirconium oxychloride octahydrate is 51.56g / L; the concentration of gallium trichloride is 7.04g / L;

[0051] S2, the area is 400cm 2 Lens cleaning paper cut into 5×5cm 2 After that, completely i...

Embodiment 3

[0058] The lithium lanthanum zirconium oxygen solid electrolyte is composed of: 60wt% polymer, 10wt% lithium salt and 30wt% lithium lanthanum zirconium oxide three-dimensional porous inorganic network.

[0059] The lithium lanthanum zirconium oxygen solid electrolyte was prepared according to the following steps:

[0060] S1. Preparation of lithium lanthanum zirconium oxygen precursor solution: 0.944g lithium acetate, 1.896g lanthanum acetate, 0.982g zirconium acetate, 0.358g tantalum pentachloride were dissolved in 25mL deionized water, and stirred at room temperature for 3 hours to obtain Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 The precursor solution; lithium acetate concentration is 37.76g / L; lanthanum acetate concentration is 75.84g / L; zirconium acetate concentration is 39.28g / L; tantalum pentachloride concentration is 14.32g / L;

[0061] S2, the area is 400cm 2 Filter paper cut into 5×5cm 2 Afterwards, completely immerse in the lithium lanthanum zirconium oxide precursor solu...

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Abstract

The invention belongs to the field of all-solid-state lithium batteries, and discloses a lithium lanthanum zirconium oxide solid electrolyte. The lithium lanthanum zirconium oxide solid electrolyte comprises 60-75wt% of a polymer, 8-15wt% of a lithium salt and 15-30wt% of a lithium lanthanum zirconium oxide three-dimensional porous inorganic network, wherein the polymer is compounded in the lithium lanthanum zirconium oxide three-dimensional porous inorganic network in situ. The invention also discloses a preparation method of the lithium lanthanum zirconium oxide solid electrolyte and application of the lithium lanthanum zirconium oxide solid electrolyte in the field of lithium ion batteries. The lithium lanthanum zirconium oxide three-dimensional porous network provides a continuous lithium ion transmission channel, so that the ionic conductivity is higher. Meanwhile, due to the existence of the lithium lanthanum zirconium oxide three-dimensional porous network, certain mechanical properties are provided for the composite solid electrolyte, the growth of lithium dendrites can be inhibited, and the high-temperature performance and safety of the battery are improved. Therefore, theinterfacial compatibility and stability between the solid electrolyte and the electrode are optimized and improved, and the formed all-solid-state lithium battery has the advantages of being stable in cycle performance, high in rate capability, low in interfacial impedance and good in stability.

Description

technical field [0001] The invention belongs to the field of all-solid-state lithium batteries, and in particular relates to a composite solid-state electrolyte, specifically a lithium-lanthanum-zirconium-oxygen solid-state electrolyte, a preparation method thereof, and an application thereof in the field of lithium-ion batteries. Background technique [0002] Lithium metal batteries have been widely regarded as the most promising next-generation energy storage devices due to their high energy density. However, lithium metal batteries using organic liquid electrolytes face safety hazards such as electrolyte leakage and combustion, and short circuits caused by lithium dendrite growth. The use of solid-state electrolytes instead of traditional organic liquid electrolytes to assemble all-solid-state lithium batteries is expected to fundamentally improve the safety of lithium batteries. Common solid electrolytes are divided into polymeric solid electrolytes and inorganic solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCY02E60/10
Inventor 付雪连卢周广廖成竹程化
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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