Electrode structure for an anode, method for manufacturing the same, and secondary battery comprising the same

Zinc anode structure with a ZnS·ZnF passivation layer formed using a Me3EtNOTF decomposition initiator

This technology improves the efficiency, capacity, and lifespan of secondary batteries by treating the surface of a metal substrate, such as zinc, with a mixed solution containing sulfur (S) and fluorine (F) sources to create a passivation layer containing amorphous ZnS and ZnF, which induces the formation of an SEI layer.

Secondary batteries, particularly metal-air batteries, have historically suffered from low charge-discharge efficiency and poor stability. Furthermore, they have been limited by the unstable formation of the SEI layer on the electrode surface, which leads to rapid performance degradation.

This technology involves modifying the surface of a metal substrate by immersing it in a reaction solution containing a Me3EtNOTF decomposition initiator and zinc salts such as Zn(OTF)2, Zn(TFSI)2, or Zn(FSI). If necessary, recesses can be formed on the surface via wet processing or imprinting to adjust flexibility and mechanical properties. Applicable to zinc-air batteries, aqueous zinc-ion batteries, and portable power sources requiring flexible electrodes, this method allows for the creation of an anode with a stable interfacial protective layer simply through immersion, without the need for separate coating equipment.

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Key Features:

• Step of preparing Me3EtNOTF by adding methyl trifluoromethanesulfonate to a mixture of trimethylethylammonium hydroxide and acetonitrile
• Step of preparing a mixed solution by dispersing Zn(OTF)2, Zn(TFSI)2, or Zn(FSI) in a solvent and adding Me3EtNOTF
• Step of forming a passivation layer containing Zn, S, and F on the substrate by immersing the metal substrate in the mixed solution
• Step of forming a plurality of recesses on the surface of the metal substrate via wet processing or imprinting prior to immersion in the mixed solution

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This invention was developed with support from the Ministry of Science and ICT for the development of a high-energy-density soft materials platform through the design of new organic superionic plastic crystal materials.

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