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Ferritic stainless steel sheet for current collectors for sulfide-based solid-state batteries, and method for manufacturing same

A stainless steel plate and solid battery technology, applied in secondary batteries, manufacturing tools, battery electrodes, etc., can solve the problems of battery performance, safety reduction, current collector corrosion, etc., and achieve the effect of excellent sulfuration resistance and adhesion

Pending Publication Date: 2022-02-22
JFE STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the case of using the above-mentioned sulfide-based solid electrolyte, there is concern about corrosion of the current collector due to sulfide.
If a material with low sulfur resistance is used for the current collector, the performance and safety of the battery may decrease

Method used

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  • Ferritic stainless steel sheet for current collectors for sulfide-based solid-state batteries, and method for manufacturing same
  • Ferritic stainless steel sheet for current collectors for sulfide-based solid-state batteries, and method for manufacturing same
  • Ferritic stainless steel sheet for current collectors for sulfide-based solid-state batteries, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0224] A stainless steel plate (raw material ferritic stainless steel plate) having a plate thickness of 10 μm having the composition described in Table 1 below (the balance being Fe and unavoidable impurities) was prepared.

[0225] With regard to the prepared stainless steel plates, under the conditions shown in the following Table 2, removal of the oxide film, etching treatment, immersion treatment or electrolytic treatment were performed (sample No. 4 to No. 9).

[0226] A sample that was not subjected to any of the above treatments was designated as sample No. 1, a sample that was only subjected to immersion treatment was designated as sample No. 2, and a sample that was subjected to only removal of the oxide film and etching treatment The sample was set as sample No.3. "-" in the production conditions in Table 2 below indicates that the treatment was not performed.

[0227] The current density in Table 2 below is a value obtained by dividing the current flowing between ...

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Abstract

Provided is a ferritic stainless steel sheet for current collectors for sulfide-based solid-state batteries, which has excellent sulfidation resistance and adhesiveness. The ferritic stainless steel sheet has a component composition containing Cr in an amount of 16% by mass or more, wherein the surface of the ferritic stainless steel sheet has an uneven structure having recessed portions and projecting portions, the average height of the projecting portions is 20 to 50 nm inclusive, the average distance between the projecting portions is 20 to 200 nm inclusive, and the [Cr] / [Fe], i.e., the ratio of the atom concentration of Cr that is present in a form other than the metal form to the atom concentration of Fe that is present in a form other than the metal form, on the surface of the ferritic stainless steel sheet is 1.0 or more.

Description

technical field [0001] The present invention relates to a ferritic stainless steel plate used for a current collector of a sulfide-based solid battery and a method for producing the same. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, the production of electric vehicles (EVs) equipped with lithium-ion secondary batteries (LIBs) has been increasing. In order to further popularize such electric vehicles, LIBs are required to further increase the energy density, shorten the charging time, increase the life, and the like. Therefore, research and development of sulfide-based solid electrolytes are ongoing. [0003] For example, Li 2 S-P 2 S 5 Sulfide-based solid electrolytes such as Li-GPS (Li, Ge, P, S)-based and LGPS (Li, Ge, P, S)-based have Li ion conductivity as high as that of electrolytes, and are therefore expected to be used as electrolytes for all-solid-state batteries. An all-solid-state battery using a sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C25F1/06C25F3/06C25F3/14C25D11/34C23C22/50H01M4/66C22C38/40C22C38/02C22C38/34C22C38/04C22C38/06C22C38/44C22C38/42C22C38/52C22C38/50C22C38/48C22C38/46C22C38/54C22C38/60
CPCC21D9/46C25F1/06C25F3/06C25F3/14C25D11/34C23C22/50H01M4/669C22C38/40C22C38/02C22C38/34C22C38/04C22C38/06C22C38/44C22C38/42C22C38/52C22C38/50C22C38/48C22C38/46C22C38/54C22C38/005C22C38/008C22C38/60C21D2211/005C22C38/004C23G1/081C23G1/085C23G1/086H01M10/0562Y02E60/10C23G1/08H01M4/66C23F1/44C22C38/001
Inventor 矢野孝宜石川伸三井昭男
Owner JFE STEEL CORP
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