Electrolyte additive structure and manufacturing method thereof

Sustained-release electrolyte additive structure using unidirectional porous needle-like carriers and polymer coating

This technology is a structural design that loads electrolyte additives or lithium salts into needle-like carriers with unidirectional pores to control the gradual release of additives within a battery. Adding a polymer coating layer to the surface allows for even more precise control over the release rate.

Conventional methods of adding additives directly to the electrolyte suffer from rapid depletion during initial battery reactions, failing to maintain performance improvements over time. Furthermore, residual additives can lead to increased impedance and degraded rate capability.

This technology utilizes needle-like carriers with unidirectional pores—such as alumina, silica, or halloysite—to load additives via vacuum impregnation. By forming a polymer coating layer, such as polyethyleneimine (PEI) or PVdF, on the surface, the release path is physically delayed. This allows for application in electrolyte composition design, lithium metal anode cells, and fast-charging cells, enabling additive replenishment when needed without excessive initial loading, while preventing impedance rise.

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Key Features:

• A needle-like carrier made of alumina, silica, or halloysite, featuring internal unidirectional pores
• Additives or lithium salts loaded within the pores of the needle-like carrier, released through inlets at both ends of the pores
• A polyethyleneimine or PVdF-based polymer coating layer formed on the surface of the needle-like carrier to regulate the additive release rate
• A step of loading additives into the pores by placing the needle-like carrier in an additive-containing solution and applying reduced pressure

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This invention was developed with support from the Ministry of Science and ICT for energy storage and conversion systems based on sustained-release material control.

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