# William Fitzhugh

> William Fitzhugh is the co-founder and CEO of Adden Energy, a Harvard spin-out scaling a self-healing, solid-state lithium-metal battery that has charged in as little as three minutes and survived more than 10,000 cycles in lab cells. A Harvard PhD in applied physics, he is trying to turn a coin-cell breakthrough into a roll-to-roll pilot line and, eventually, batteries that let an EV recharge in the time it takes to fill a gas tank.

- **Role:** Co-Founder & CEO at Adden Energy
- **Organizations:** Adden Energy, Harvard University, American Nanotechnologies, Inc.
- **Nationality:** American
- **Education:** PhD, Applied Physics, Harvard University
- **Known for:** Co-founded and leads Adden Energy, a Harvard spin-out commercializing solid-state lithium-metal battery technology., Helped develop a solid-state battery design demonstrating charge times as low as three minutes and over 10,000 cycles in lab-scale cells., Secured an exclusive technology license from Harvard's Office of Technology Development.

## Career timeline

- **2015** — Founded American Nanotechnologies, Inc. and served as CEO.
- **2020** — Completed PhD in Applied Physics at Harvard University in Xin Li's lab.
- **2021** — Co-founded Adden Energy with Xin Li, Luhan Ye, and Fred Hu, originating as a Harvard Grid Accelerator project.
- **2022** — Adden Energy launched publicly with an exclusive technology license from Harvard and a $5.15M seed round; Fitzhugh became Co-Founder and CEO.
- **2024** — Adden Energy raised $15M Series A led by At One Ventures to build a roll-to-roll pilot production line in Waltham, MA.
- **2025** — Represented Adden Energy at industry events including Battery Tech USA 2025 and battery safety summits.

## Achievements

- Co-founded and leads Adden Energy, a Harvard spin-out commercializing solid-state lithium-metal battery technology.
- Helped develop a solid-state battery design demonstrating charge times as low as three minutes and over 10,000 cycles in lab-scale cells.
- Secured an exclusive technology license from Harvard's Office of Technology Development.
- Raised a $5.15M seed round (2022) and a $15M Series A (2024), bringing total funding to roughly $25M.
- Alumnus of the Innovation Crossroads entrepreneurial program (Oak Ridge / University of Tennessee Research Park).

## Latest updates

- **2024-10** — Adden Energy closed a $15M Series A led by At One Ventures to fund a roll-to-roll pilot production facility in Waltham, MA.
- **2025-01** — Fitzhugh attended Battery Tech USA 2025 and other battery industry events representing Adden Energy.

## Links

- Website: https://addenenergy.com
- LinkedIn: http://www.linkedin.com/in/wfitzhugh

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Profile page: https://yespress.io/william-fitzhugh
Published by YesPress — https://yespress.io
Last updated: 2026-06-03