Multiple-Electron Aqueous Battery

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College Park, Maryland
Project Term:
03/18/2014 - 05/31/2022

Technology Description:

The University of Maryland (UMD) is using water-based magnesium and hydrogen chemistries to improve the energy density and reduce the cost of EV batteries. The lithium-ion batteries typically used in most EVs today require heavy components to protect the battery and ensure safety. Water-based batteries are an inherently safer alternative, but can be larger and heavier compared to lithium-ion batteries, making them inefficient for use in EVs. To address this, UMD’s water-based battery will use a magnesium hydrogen chemistry that would double energy storage capacity, for a much lighter energy storage system. Furthermore, UMD’s use of safe inexpensive materials could reduce the cost of battery management, improve reliability, and allow for operation across a wider range of temperatures.

Potential Impact:

If successful, UMD’s water-based battery would be inherently safer than lithium-ion batteries with a comparable energy density, but would be smaller, lighter, and less expensive.


The mass adoption of EVs would diminish the demand for petroleum, dramatically reducing U.S. dependence on foreign oil.


Greater use of EVs would reduce U.S. greenhouse gas emissions, 28% of which come from the transportation sector.


Technological advancements from the RANGE program could enable EVs to travel significantly further on a single charge at a much lower cost than that of current EVs and conventional vehicles.


ARPA-E Program Director:
Dr. Halle Cheeseman
Project Contact:
Prof. Chunsheng Wang
Press and General Inquiries Email:
Project Contact Email:


Liox Power
U.S. Army Research Laboratory

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