Ambri

Ambri. It is an American company specializing in the development of long-duration energy storage systems based on a proprietary liquid metal battery technology. Founded by Massachusetts Institute of Technology professor Donald Sadoway and former doctoral student David Bradwell, the company aims to provide grid-scale solutions for renewable energy integration. Its technology emerged from foundational research conducted at MIT and has attracted significant attention from investors and industrial partners.

History

The company's origins are rooted in electrochemistry research led by Donald Sadoway within the Department of Materials Science and Engineering at MIT. Inspired by the industrial-scale electrochemistry of aluminum smelting, Sadoway and his team, including David Bradwell, sought to create a low-cost, durable battery for the power grid. Key early funding and validation came from the Advanced Research Projects Agency-Energy (ARPA-E) under its BEEST program, alongside support from Bill Gates, who became a prominent early investor. After a successful laboratory demonstration, the company was spun out in 2010, initially operating under the name Liquid Metal Battery Corporation before rebranding to Ambri. The company established its headquarters and pilot manufacturing facility in Marlborough, Massachusetts, advancing its technology toward commercial deployment.

Technology

Ambri's core innovation is a stationary liquid metal battery that uses molten antimony and molten magnesium as electrodes, with a molten salt electrolyte operating at high temperatures. This all-liquid, self-segregating design, based on the principles of density and immiscibility, eliminates many failure mechanisms found in conventional lithium-ion or flow battery systems, such as separator degradation. The cells are housed in robust, sealed steel containers, forming modular units that are aggregated into larger systems. The technology is designed for exceptional longevity, capable of tens of thousands of cycles with minimal capacity fade, and is inherently safe, with no risk of thermal runaway. Its primary application is for long-duration storage, from 4 to 24 hours, to support grid energy storage, solar power, and wind power projects.

Financial challenges

The path to commercialization proved financially arduous, leading to significant restructuring. In 2022, facing liquidity issues and delays in scaling production, Ambri filed for Chapter 11 bankruptcy protection in the United States Bankruptcy Court for the District of Delaware. The filing revealed challenges in securing sufficient capital to build its first commercial-scale manufacturing line. The bankruptcy process culminated in the company's assets being acquired by a new entity, LMB Opco, LLC, controlled by its existing secured lender, Paulson & Co., effectively wiping out equity held by previous investors like Bill Gates and TotalEnergies. This period highlighted the capital intensity and high execution risks inherent in scaling novel energy storage hardware technologies.

Partnerships and commercialization efforts

Despite financial hurdles, Ambri has established strategic partnerships to validate and deploy its technology. A significant early partnership was formed with Pacific Gas and Electric Company for a demonstration project at the Lawrence Livermore National Laboratory. The company also secured a major agreement with Terrestrial Energy to explore integration with nuclear power plants. Following its restructuring, the new ownership has focused on securing anchor customers, notably signing a multi-year supply agreement with Xcel Energy for a project in Colorado. Further commercialization efforts involve targeting data centers and microgrid applications, with ongoing project development in partnership with engineering firms like Black & Veatch.