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Particle-size mixing routes to stable silicon anodes for lithium-ion batteries

Technology

In development

University

Blending silicon nanoparticles and microparticles in optimized ratios produces stable, high-capacity silicon anodes that retain over 85% capacity across hundreds of cycles using industry-standard slurry casting.

Researchers at Montana State University have developed a novel method for creating majority silicon electrodes with high electrochemical stability, enabling long-lasting, high-capacity lithium-ion batteries.

Background

Silicon is a promising alternative to graphite as the anode material in lithium-ion batteries due to its high lithiation capacity (~10 times that of graphite), low redox potential, and abundance. However, its extreme volume expansion during cycling (>300%) causes electrode instability, rapid capacity loss, and challenges in maintaining electrical connectivity. This invention introduces a cost-effective solution that leverages optimized particle-size mixing to overcome these limitations, enabling stable, high-performance silicon electrodes directly from powder precursors.

Technology Overview

This invention combines silicon nanoparticles (NPs) and microparticles (MPs) in optimized ratios (e.g., 3:7) to create stable silicon electrodes. The mixed particle sizes synergistically enhance binding properties and porosity, mitigating the effects of volume expansion and improving cycling stability. Using standard carbonate-based electrolytes with fluoroethylene carbonate (FEC) additives, the electrodes retain >85% of their original capacity over hundreds of cycles. The method is compatible with industry-standard slurry-casting techniques and can be extended to other high-volume expansion electrode materials for lithium-ion and beyond-lithium battery chemistries.

Benefits

Enables stable, high-capacity silicon anodes with extended cycle life.
Reduces reliance on expensive pure nanoparticles by using majority microparticles.
Provides a scalable solution compatible with existing battery manufacturing processes.
Improves energy density and performance for advanced battery applications.

Applications

High-performance lithium-ion batteries for electric vehicles and portable electronics.
Development of next-generation batteries, including sodium-ion and solid-state chemistries.
Research and manufacturing of advanced anode materials for energy storage systems.

Opportunity

Available for license: methods for electrode fabrication, optimized particle-size mixing strategies, and supporting data. Collaborative opportunities include optimization for specific applications, scale-up, and integration into commercial battery production.

IP Status

Provisional patent application filed. Available for licensing and/or collaboration.

About Montana State University

Montana State University's substantial research enterprise growth has been accompanied by focused investments in innovation and research translation, creating new opportunities for companies to engage with MSU research and expertise. A particular strength is MSU’s network of specialized centers, institutes, and industry-accessible core facilities, which bring together multidisciplinary expertise, advanced research infrastructure, testing capabilities, and established pathways for working with industry partners. MSU is one of a select group of universities participating in the NSF's Accelerating Research Translation (ART) program, which is building the capacity and infrastructure needed to translate more research discoveries into solutions with real-world impact. The growing MSU Innovation Campus and expanding incubator infrastructure provide additional opportunities for university-industry interaction, startup development, and technology-focused companies. These efforts are complemented by MSU’s Technology Transfer Office, which works with researchers and companies to protect and license MSU inventions and facilitate industry-sponsored research collaborations.