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Solid-state sodium ion electrolyte, preparation method thereof and all-solid-state sodium battery

An electrolyte and sodium ion technology, applied in the field of solid-state sodium ion electrolyte and its preparation, and all-solid-state sodium battery, can solve the problems of low sodium ion conductivity, high processing cost, poor interface stability, etc., and achieves simple process and high generation efficiency. , the effect of low battery internal resistance

Active Publication Date: 2020-04-21
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inorganic ceramic electrolytes usually have high ionic conductivity, but are easy to react with electrodes, have poor interface stability, and high processing costs; polymer electrolytes usually have good flexibility and stable interfaces, and are easy to process and shape. Low production cost and promising applications in solid-state batteries, but typically low Na-ion conductivity at low temperatures

Method used

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  • Solid-state sodium ion electrolyte, preparation method thereof and all-solid-state sodium battery
  • Solid-state sodium ion electrolyte, preparation method thereof and all-solid-state sodium battery
  • Solid-state sodium ion electrolyte, preparation method thereof and all-solid-state sodium battery

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[0027] The invention provides a kind of preparation method of solid sodium ion electrolyte, comprises the following steps:

[0028] A) stirring the sodium salt, the initiator and the liquid polymer monomer under low water and low oxygen conditions to obtain a solid sodium ion electrolyte precursor slurry;

[0029] B) Under the irradiation of ultraviolet light, the slurry of the solid sodium ion electrolyte precursor is subjected to in-situ polymerization reaction to obtain a solid sodium ion electrolyte.

[0030] In the invention, the sodium salt, the initiator and the liquid polymer monomer are stirred under the condition of low water and low oxygen to obtain the solid sodium ion electrolyte precursor slurry.

[0031] Specifically, it includes: first adding sodium salt and initiator into solvent-free liquid polymer monomers, and fully stirring in a low-water and low-oxygen glove box to obtain the precursor slurry before the solid sodium ion electrolyte.

[0032] Among them, ...

Embodiment 1

[0053] 0.7g sodium vanadium phosphate (Na 3 V 2 (PO 4 ) 3 ), 0.1g conductive carbon black and 0.2g binder (PEO+NaClO 4 ) mixed and ground and stirred evenly, and coated on the surface of aluminum foil; dried in a vacuum oven at 60°C, and cut to obtain a positive electrode sheet after drying;

[0054] Then, sodium bis(fluorosulfonyl)imide (NaFSI) and polydimethylolpropionic acid (DMPA) with a mass fraction of 1% were added to the polymer monomer dimethacrylic acid (PEGDMA) without any solvent. In the solution, the molar ratio of the polymer monomer to the sodium salt was adjusted to 16:1, and it was controlled to be placed at room temperature and fully stirred to obtain a uniform polymer precursor slurry. Subsequently, move the polymer precursor slurry into a dull glove box, control the content of water and oxygen in the glove box to be lower than 0.5ppm, and then uniformly coat the polymer precursor slurry by casting method On the positive electrode sheet, thereby filling...

Embodiment 2

[0057] Sodium bis(fluorosulfonyl)imide (NaFSI) and polydimethylolpropionic acid (DMPA) with a mass fraction of 1% were added to the polymer monomer dimethacrylic acid (PEGDMA) solution without any solvent , adjust the molar ratio of the polymer monomer to the sodium salt to be 22:1, place it at room temperature and stir thoroughly to obtain a uniform polymer precursor slurry. Subsequently, move the polymer precursor slurry into a glove box with an ultraviolet light source, control the water and oxygen content in the glove box to be lower than 0.5ppm, then cast the polymer precursor slurry on a polytetrafluoroethylene plate, The polymer electrolyte precursor was solidified and polymerized under ultraviolet light irradiation, and after 20 minutes of ultraviolet light irradiation at a temperature of 30° C., a sodium ion solid sodium ion electrolyte film with a thickness of about 150 μm was obtained.

[0058] Test the ionic conductivity of the prepared solid sodium ion electrolyte...

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Abstract

The invention provides a preparation method of a solid sodium ion electrolyte, comprising the following steps: A) stirring a sodium salt, an initiator and a liquid polymer monomer under low-water andlow-oxygen conditions to obtain solid sodium ion electrolyte precursor slurry; and B) carrying out an in-situ polymerization reaction on the solid sodium ion electrolyte precursor slurry under the irradiation of ultraviolet light to obtain the solid sodium ion electrolyte. The solid-state sodium ion electrolyte provided by the invention has high ionic conductivity, good electrochemical compatibility and good flexibility, and can reduce the internal resistance of an all-solid-state sodium battery and improve the electrochemical performance of the all-solid-state sodium battery. The solid-statesodium ion polymer electrolyte provided by the invention is relatively high in ionic conductivity, and has low battery internal resistance, excellent long-cycle performance and low self-discharge performance when being assembled into a solid-state sodium battery. The preparation method of the solid sodium ion electrolyte provided by the invention is simple in process, low in cost, high in production efficiency and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a solid sodium ion electrolyte, a preparation method thereof, and an all-solid sodium battery. Background technique [0002] Lithium-ion batteries are considered to be the most promising chemical power sources due to their advantages such as high energy density, long charge-discharge life, small self-discharge, and no memory effect. However, the lack of lithium resources and high production costs limit the development of lithium-ion batteries. Because sodium is abundant in the earth's crust and cheap, sodium-ion batteries have received extensive attention from researchers. At present, traditional sodium-ion batteries mostly use liquid organic electrolytes, which are prone to problems such as liquid leakage and electrode corrosion. At excessively high temperatures, there is even a danger of combustion and explosion. In order to solve the problem of low s...

Claims

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Application Information

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IPC IPC(8): C08F122/14C08F122/20C08F2/48H01M10/0565H01M10/054
CPCC08F2/48H01M10/054H01M10/0565H01M2300/0082Y02E60/10
Inventor 余彦姚霞银魏振耀姚雨
Owner UNIV OF SCI & TECH OF CHINA
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