Self-healing 3D Nanoporous CuS Anode and Sodium Secondary Battery Comprising the Same

CuS Anode Forming a 3D Porous Structure via Self-Healing During Charge/Discharge

This technology induces copper sulfide (CuS) anode active materials to undergo fragmentation and self-healing during repeated charge/discharge cycles in specific electrolytes (including DME), transforming them into a 3D porous structure.

Conventional copper sulfide anodes have suffered from low structural stability and degraded cycle life due to the fragmentation of active materials during repeated charge/discharge, as well as limitations in increasing active material loading due to binder constraints.

By using a DME (dimethoxyethane) electrolyte, this technology allows CuS to fragment and then recombine (self-heal) during charge/discharge to form a 3D porous structure, which mitigates volume expansion stress. Furthermore, by introducing a PAA (polyacrylic acid) binder, the active material content can be increased to 70–80 wt% or more, improving electrochemical performance and stability and providing a distinct technological advantage in the secondary battery anode market.

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Key Features:

• Preparing a slurry using an anode material composition that includes a CuS anode active material with a particle size of 80 to 100 micrometers and a polyacrylic acid binder
• Manufacturing a CuS anode by applying the prepared anode material slurry onto a current collector
• Inducing fragmentation and self-healing through repeated charge/discharge cycles in an electrolyte containing dimethoxyethane
• A configuration that induces the CuS anode active material to transform into a 3D nanoporous structure through repeated charge/discharge cycles

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