William Fitzhugh, Co-Founder and CEO of Adden Energy
- Harvard Grid
- Apr 10
- 1 min read
Adden Energy is a startup focused on developing next-generation solid-state batteries, particularly for electric vehicles (EVs). The company, spun out from Harvard University, is working on lithium-metal battery technology that aims to offer faster charging times, longer lifespan, and improved safety compared to traditional lithium-ion batteries. Their innovation could significantly enhance EV adoption by addressing range anxiety and charging concerns.

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William Fitzhugh completed his PhD in Applied Physics in 2020 from Harvard University. He is the CEO and Co-Founder of Adden Energy, a company that is combating climate-change with next-gen battery technologies. Adden Energy was founded by a team of scientists at Harvard University as a Grid Accelerator project with Xin Li, Associate Professor of Materials Science at SEAS. By developing and scaling up a brand-new type of solid-state battery, benchmarks such as charge times as low as 3 minutes and capacity retention for over 10,000 cycles in a lab-scale cell have been realized. This technology will enable mass adoption of EVs around the world and contribute greatly to a cleaner future.
One piece of advice to Venturing@Harvard
Working with business-oriented people was crucial for interacting with the bureaucracy of legacy OEMs.