Constantin Ionel Stefan

Title: Innovations by Constantin Ionel Stefan in Lithium Ion Battery Technology

Introduction

Constantin Ionel Stefan is a prominent inventor based in San Jose, California. He has made significant contributions to the field of lithium ion battery technology, holding a total of 11 patents. His work focuses on enhancing the performance and longevity of battery anodes through innovative materials and fabrication methods.

Latest Patents

One of his latest patents is titled "Compositionally modified silicon coatings for use in a lithium ion battery anode." This invention provides nanostructures for lithium ion battery electrodes and outlines methods of fabrication. The silicon coating includes a non-conformal, more porous silicon-rich layer and a conformal, denser layer on top. This dual-layer approach utilizes two different deposition processes: a PECVD layer for the non-conformal layer and a thermal CVD process for the conformal layer. This innovative design prevents silicon crystalline domain growth, limits macroscopic swelling, increases lithium diffusion rates, and significantly enhances battery life during charge and discharge cycles.

Another notable patent is "Structurally controlled deposition of silicon onto nanowires." Similar to his previous work, this invention also focuses on nanostructures for lithium ion battery electrodes. The method involves a nanostructure template coated with a silicon coating, which includes both a non-conformal, porous layer and a conformal, denser layer. The resulting anodes demonstrate longer cycle lifetimes compared to those made using either deposition method alone.

Career Highlights

Throughout his career, Constantin has worked with notable companies such as Amprius, Inc. and Amprius Technologies, Inc. His experience in these organizations has allowed him to refine his expertise in battery technology and contribute to groundbreaking advancements in the field.

Collaborations

Constantin has collaborated with talented individuals such as Song Han and Zuqin Liu. Their combined efforts have led to innovative solutions in lithium ion battery technology, further enhancing the performance of energy storage systems.

Conclusion

Constantin Ionel Stefan's contributions to lithium ion battery technology through his patents and collaborations have positioned him as a key figure in the field. His innovative approaches continue to influence the development of more efficient and durable battery systems.