Organic/inorganic composite electrolyte membrane for solid-state sodium ion battery, preparation and application thereof

A composite electrolyte membrane and inorganic composite technology, which is applied in the field of electrolyte preparation, can solve problems such as air and water instability, poor interface compatibility, and poor ionic conductivity, and achieve excellent mechanical properties, high ionic conductivity, and high ion conductivity. The effect of migration number

Active Publication Date: 2020-09-04
HUNAN AGRICULTURAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Among them, the interfacial compatibility of the polymer electrolyte is good, but the ionic conductivity at room temperature is poor; the ionic conductivity of the sulfurized electrolyte is high, but the voltage window is narrow, and it is unstable to air and water; the oxide electrolyte shows relatively low High ionic conductivity, good mechanical strength and electrochemical stability, but poor interfacial compatibility

Method used

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  • Organic/inorganic composite electrolyte membrane for solid-state sodium ion battery, preparation and application thereof
  • Organic/inorganic composite electrolyte membrane for solid-state sodium ion battery, preparation and application thereof
  • Organic/inorganic composite electrolyte membrane for solid-state sodium ion battery, preparation and application thereof

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[0039] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0040] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0041] Na used in the following examples 3 Zr 2 Si 2 PO 12 The preparation method of inorganic ceramic powder refers to following documents:

[0042] Narayanan S, Reid S, Butler S, et al. Sintering temperature, excess sodium, and phosphorous de...

Embodiment 1

[0045] Synthesis of NZSP(Na 3 Zr 2 Si 2 PO 12 ) Inorganic ceramic powder, the NZSP ceramic powder prepared by 100mg is mixed with 300mg PVDF-HFP, fully dispersed in 3ml of acetone and methylacetamide mixed solution with a volume ratio of 2:1, fully stirred to obtain a mixed slurry, The mixed slurry was evenly scraped on a glass plate, then soaked in water to form a film, and dried to prepare a flexible porous base film with a thickness of 20 μm. The flexible porous base membrane has a porous ceramic skeleton structure with a pore diameter of about 1 μm, which is recorded as a composite electrolyte membrane before curing.

[0046] Dissolve 40mg of polyethylene oxide (PEO) in 2g of dimethylsulfoxide (DMSO), and add 40mg of 2-hydroxy-2-methylpropane to 1ml of ethoxylated trimethylolpropane triacrylate Propiophenone was used as photoinitiator and mixed well. Take 1ml of the above-mentioned PEO solution and add it to the above-mentioned polymer monomer solution and stir evenly...

Embodiment 2

[0053] Other conditions are the same as in Example 1, except that 100 mg of dibenzoyl peroxide is added to 1 ml of ethoxylated trimethylolpropane triacrylate and mixed uniformly. Take 1ml of PEO solution and add it to the above polymer monomer solution and stir evenly, finally add 150mg sodium hexafluorophosphate, stir evenly and set aside. A circular flexible porous membrane with a diameter of 16 mm was soaked in the above-prepared monomer solution for 12 hours, taken out and placed in an oven for curing for 30 minutes to obtain the target electrolyte membrane.

[0054] The electrochemical performance test results show that the thickness of the composite electrolyte membrane prepared in Example 2 is 40 μm, the ion mobility coefficient at 60°C is 0.603, and the ion conductivity is 3.20*10 -4 S / cm, using sodium vanadium phosphate as the positive electrode to assemble a sodium-ion half-cell, the discharge capacity is 92mA h / g at a rate of 0.2C.

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Abstract

The invention provides an organic/inorganic composite electrolyte membrane for a solid-state sodium ion battery, preparation and application of the organic/inorganic composite electrolyte membrane, wherein a flexible organic/inorganic composite porous membrane is prepared by utilizing high mechanical strength of an inorganic ceramic and high elasticity and interfacial compatibility of a polymer. According to the invention, a porous base membrane is soaked in a polymer precursor solution containing a sodium salt, and the polymer precursor solution is cured in situ in the pore channels of the porous base membrane by means of photo-initiation or thermal initiation; and the composite electrolyte membrane prepared by the invention has high ionic conductivity, excellent mechanical properties andhigh ion mobility, shows stable battery operation at a high temperature (60 DEG C), and has a wide application prospect.

Description

technical field [0001] The invention relates to the preparation and application of electrolytes in solid-state batteries, in particular to an organic / inorganic composite electrolyte membrane used in solid-state sodium-ion batteries and its preparation and application. Background technique [0002] With the continuous development of new renewable energy sources, the demand for energy storage is increasing. In various energy storage systems, lithium-ion batteries are favored by people because of their significant advantages such as high energy density, power density, long cycle life, green environmental protection and no memory effect. However, the limited and uneven distribution of lithium resources in the earth's crust has become a major bottleneck restricting its large-scale and long-term development. From the perspective of long-term demand for energy development and utilization, the development of a secondary battery system based on abundant resources and low price has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/054
CPCH01M10/054H01M10/056H01M2300/0091H01M2300/0094Y02E60/10
Inventor 吴雄伟凌苇邓奇周鹏晟曾宪祥马强王泓睿左兰兰胡海燕周春娇
Owner HUNAN AGRICULTURAL UNIV
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