New Patents

Doped Carbon-Sulfur Species Nanocomposite Cathode For LI-S Batteries

Donghai Wang, associate professor of mechanical engineering

Patent No. US 9,225,011

Lithium-sulfur batteries have attracted increasing attention as next-generation energy storage devices because of their high theoretical capacity (1672mA h g-1) and energy density (2600 Wh kg-1). Donghai Wang’s team developed a novel doped carbon-sulfur nanocomposite material as a cathode for lithium-sulfur batteries. The doping can effectively promote chemical adsorption of both sulfur and lithium polysulfide intermediates, leading to a high coulombic efficiency of >99% and long-cycle life.

Synthesis of Micro-sized Interconnected SI-C Composites

Donghai Wang, associate professor of mechanical engineering

Patent No. US 9,269,949

This disruptive technology provides silicon materials as anodes to replace conventional carbon materials to make lithium-ion batteries last longer, charge faster and cost less. The materials are unique becuase, unlike most silicon anode materials in the market, these silicon materials are micro-sized as a whole, which is in line with currently used graphite, while at the same time having the nanoscale building blocks. These features make them drop-in materials for conventional battery manufacturing.

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With more than 60 faculty members, 330 graduate students, and 800 undergraduate students, the Penn State Department of Mechanical Engineering embraces a culture that welcomes individuals with a diversity of backgrounds and expertise. Our faculty and students are innovating today what will impact tomorrow’s solutions to meeting our energy needs, homeland security, biomedical devices, and transportation systems. We offer B.S. degrees in mechanical engineering as well as resident (M.S., Ph.D.) and online (M.S.) graduate degrees in mechanical engineering. See how we’re inspiring change and impacting tomorrow at

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