Reference #: 1738
The University of South Carolina is offering licensing opportunities for Immiscible-Multilayer Battery Electrode Architecture.
Background:
Battery electrodes undergo volumetric expansion and contraction during electrochemical cycling. While this effect is modest in intercalation-based electrodes such as layered transition-metal oxides, it becomes significantly more pronounced in conversion- and alloying-type electrodes, including sulfur cathodes and silicon anodes. Repeated volume changes can lead to cracking, fracturing, delamination from the current collector, and impaired ionic and electronic transport—especially in thick, high-areal-loading electrodes. These mechanical and transport limitations restrict achievable energy density, cyclability, and manufacturability across a wide range of battery chemistries.
Invention Description:
This invention relates to a multilayer battery electrode architecture designed to enhance cell cyclability by accommodating mechanical strain associated with volumetric expansion and contraction during electrochemical cycling. The architecture comprises multiple electrode layers with differentiated interfacial and mechanical characteristics that collectively reduce stress accumulation, maintain adhesion to the current collector, and preserve effective ionic and electronic transport across the electrode thickness.
In certain embodiments, the multilayer structure incorporates layers formed using chemically or physically distinct binding environments, resulting in interfaces that dissipate mechanical stress and inhibit crack propagation during repeated charge–discharge cycles. The layered configuration enables improved structural stability in thick, high-areal-loading electrodes and under conditions where transport limitations are typically exacerbated.
The multilayer electrode architecture is adaptable to a wide range of electrochemically active materials and battery chemistries, including electrodes that undergo modest volume change as well as those that experience substantial expansion and contraction. While electrodes based on conversion or alloying reactions may particularly benefit from this approach, the architecture is not limited to any specific active material, binder chemistry, solvent system, or fabrication method.
Potential Applications:
This technology is applicable to electrodes used in lithium-ion, lithium-sulfur, sodium-ion, silicon anode and other emerging battery systems. It may be implemented for cathodes or anodes composed of intercalation, conversion, or alloying materials. Adoption of this architecture could impact a multi-billion-dollar battery manufacturing market, with electrode fabrication representing approximately 10-15% of total system cost.
Advantages and Benefits:
Compared to conventional single-layer electrode architectures, the multilayer approach improves mechanical robustness by distributing electrochemically induced strain across multiple interfaces within the electrode. The resulting structural configuration reduces crack formation, limits delamination, and supports effective ionic and electronic transport in thick electrodes. These advantages enable higher active-material loading, improved cycling stability, and enhanced performance under transport-limited operating conditions across a broad range of battery chemistries.