# Adden Energy

> Adden Energy is a Harvard spinout building dynamically-stable, self-healing solid-state lithium-metal batteries designed to make electric vehicles charge in minutes, last a million miles, and never catch fire. Headquartered in Waltham, Massachusetts, the company is scaling its lab breakthrough into commercial pouch cells on a roll-to-roll pilot line and shipping samples to automakers for validation.

- **Founded:** 2021
- **Headquarters:** Waltham, Massachusetts, United States
- **Founders:** William Fitzhugh (Co-Founder & CEO), Luhan Ye (Co-Founder & CTO), Xin Li (Co-Founder (Harvard SEAS Associate Professor)), Fred Hu (Co-Founder & Board Director)
- **Team size:** ~23 employees
- **Products:** Dynamically-Stable Solid-State Cells, EV-Format Pouch Cells, Roll-to-Roll Pilot Line
- **Notable:** Spun out of Harvard with an exclusive license to self-healing solid-state battery technology, Demonstrated lab cells with charge times as low as 3 minutes and 6,000-10,000 cycle life, Reported roughly 50% higher energy density than conventional lithium-ion in early prototypes

## Products & services

- **Dynamically-Stable Solid-State Cells** — All-solid-state pouch cells with a porous lithium-metal anode and high-nickel NMC cathode, built around a self-healing solid electrolyte separator discovered at Harvard that suppresses dendrites during both manufacturing and use.
- **EV-Format Pouch Cells** — Commercially acceptable, EV-compatible pouch-cell form factors delivering extreme fast charging, high energy density, and robust low-temperature performance, shipped to OEMs for validation.
- **Roll-to-Roll Pilot Line** — An R&D pilot manufacturing line in Waltham, MA for producing sample cells at scale and proving out manufacturability ahead of mass production.

## Achievements

- Spun out of Harvard with an exclusive license to self-healing solid-state battery technology
- Demonstrated lab cells with charge times as low as 3 minutes and 6,000-10,000 cycle life
- Reported roughly 50% higher energy density than conventional lithium-ion in early prototypes
- Raised $15M Series A in October 2024, ~$25M total funding
- Commissioned a roll-to-roll R&D pilot line in Waltham, MA in February 2025
- Began shipping solid-state sample pouch cells to automakers for validation

## Latest updates

- **2024-10** — Closed $15M Series A led by At One Ventures to build a roll-to-roll pilot production line.
- **2025-02** — Commissioned its R&D pilot line and began producing solid-state sample cells for OEM validation.

## Links

- Website: https://addenenergy.com
- LinkedIn: https://www.linkedin.com/company/adden-energy

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Profile page: https://yespress.io/adden-energy
Published by YesPress — https://yespress.io
Last updated: 2026-06-07