Method for improving durability of electrochemical devices

Incorporating a metal phthalocyanine compound into the electrolyte of electrochemical devices forms a protective interface, addressing the issue of metal ion migration and enhancing device durability by maintaining the integrity of the cathode-electrolyte and solid electrolyte interfaces.

JP2025137450APending Publication Date: 2025-09-19NAT TAIWAN UNIV OF SCI & TECH
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Patent Information

Application Number
JP2025030713
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-07
Filing Date
2025-02-27
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

Metallic electrode materials in electrochemical devices dissolve metal ions during charge/discharge, destroying the electrode surface structure and degrading the cathode-electrolyte and solid electrolyte interfaces, reducing device durability.

Method used

Incorporating a metal phthalocyanine compound into the electrolyte of electrochemical devices, which forms a beneficial positive electrode interface and prevents transition metal ions from migrating to the negative electrode, thereby enhancing the durability of the device.

Benefits of technology

The method improves the durability of electrochemical devices by forming a protective interface that prevents metal ion migration and maintains the integrity of the solid electrolyte interface, leading to better electrical performance and extended device life.

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Abstract

To provide a method for improving durability of an electrochemical device, which solves a problem that an electrolyte of a current electrochemical device dissolves a metal ion, destroys an electrode surface structure, and cannot produce a good cathode electrolyte interface (CEI), and in which even a transition metal ion passes through a separator to reach an anode, and a solid electrolyte interface (SEI) of a surface of the anode deteriorates, and the durability of the electrochemical device deteriorates.SOLUTION: A metal phthalocyanine is added to a positive electrode material and / or an electrolyte of an electrochemical device, and after charging and discharging of the electrochemical device, the metal phthalocyanine is converted into a phthalocyanine compound containing a transition metal from the positive electrode material to generate a beneficial positive electrode electrolyte interface on a surface of the positive electrode material and / or the surface of the device. A transition metal ion is prevented from being released to a negative electrode to affect formation of a solid electrolyte interface on the negative electrode surface, thereby improving durability of the electrochemical device.SELECTED DRAWING: Figure 1
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