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Sodium battery comprising asymmetric modification layer and preparation method thereof

A technology of sodium battery and modification layer, which is applied in the field of energy materials, can solve the problem that the interface behavior between the positive and negative electrodes and the solid electrolyte cannot be solved well, and achieve the simple and easy processing method, low cost, and strong raw material selectivity Effect

Active Publication Date: 2016-09-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, how to simultaneously improve the interface behavior between the positive and negative electrodes and the solid electrolyte has not been well resolved so far.

Method used

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  • Sodium battery comprising asymmetric modification layer and preparation method thereof
  • Sodium battery comprising asymmetric modification layer and preparation method thereof
  • Sodium battery comprising asymmetric modification layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The porous nickel layer (11 μm) and the porous carbon layer (6 μm) were modified on the inner and outer surfaces of the β″-alumina solid electrolyte by sol-gel coating method and wet chemical coating method, and then the modified β″-alumina Assemble a sodium-nickel chloride battery with a design capacity of 15Ah. The sodium negative electrode contacts the porous carbon layer, and the nickel chloride positive electrode contacts the porous nickel layer. Figure 2 shows the scanning electron microscope pictures of the porous carbon layer and the porous nickel layer. Then test the charge and discharge curve of the battery under constant current (0.5A), such as image 3 , found that the first charge and discharge polarization voltage of the battery was as low as 0.05V. Polarization was significantly improved compared to unmodified cells.

Embodiment 2

[0053] The porous nickel layer (11 μm) and metal tin layer (200 μm) were modified on the inner and outer surfaces of the β″-alumina solid electrolyte by sol-gel coating method and evaporation method, and then the modified β″-alumina oxide was used to assemble the design A sodium-nickel chloride battery with a capacity of 15Ah. The sodium negative electrode contacts the metal tin layer, and the nickel chloride positive electrode contacts the porous nickel layer. After testing the charge and discharge curve of the battery under constant current (0.5A), it was found that the first charge and discharge polarization voltage of the battery was as low as 0.08V. Polarization was significantly improved compared to unmodified cells.

Embodiment 3

[0055] The porous iron layer (5 μm) and porous nickel layer (11 μm) were modified on the inner and outer surfaces of the β″-alumina solid electrolyte by the template coating method and the sol-gel coating method, and then assembled with the modified β″-alumina solid electrolyte A sodium-ferric chloride battery with a design capacity of 15Ah. The sodium negative electrode contacts the porous nickel layer, and the ferric chloride positive electrode contacts the porous iron layer. After testing the charge and discharge curve of the battery under constant current (0.5A), it was found that the first charge and discharge polarization voltage of the battery was as low as 0.06V. Polarization was significantly improved compared to unmodified cells.

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Abstract

The invention relates to a sodium battery comprising an asymmetric modification layer and a preparation method thereof. The sodium battery comprises a metal sodium anode, a solid electrolyte, a metal halide cathode, arranged on the surface of the solid electrolyte and located between the electrolyte and the The anode modification layer between the anodes, and the cathode modification layer arranged on the surface of the solid electrolyte and between the electrolyte and the cathode; the anode wetting layer and the cathode porous film are composed of different materials. The sodium battery comprising an asymmetric modification layer provided by the invention can achieve the purpose of simultaneously improving the interface properties between positive and negative electrodes and solid electrolytes such as β"-alumina.

Description

technical field [0001] The invention belongs to the field of energy materials, and relates to a sodium battery, more specifically, to an asymmetric modification layer for a sodium battery, a sodium battery comprising the asymmetric modification layer and a preparation method thereof. Background technique [0002] Medium-temperature reversible sodium batteries, including sodium-sulfur batteries and sodium-nickel chloride batteries (also known as ZEBRA batteries), are due to their high theoretical specific energy (such as ZEBRA batteries are 790Wh kg -1 ), long life, high conversion efficiency, good cycle stability and rate performance, and low preparation and maintenance costs, have become a promising large-scale static energy storage technology, and have shown good performance in power applications Prospects. In addition, sodium batteries usually use β″-alumina ceramics as a solid electrolyte, which has good stability and is a fully sealed battery that does not release any ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M10/39H01M4/02
CPCH01M10/38H01M10/3909Y02E60/10Y02P70/50
Inventor 温兆银胡英瑛张敬超吴相伟吴梅芬
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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