Lithium-Seawater Battery for Backup Power on Underwater Vehicles

­An AUV backup battery with a lithium anode and a seawater cathode. Background: Extremely high energy density batteries are needed for underwater electric ships such as unmanned submarines and naval observatories. Technology Overview: The lithi…

­An AUV backup battery with a lithium anode and a seawater cathode.

Background:

Extremely high energy density batteries are needed for underwater electric ships such as unmanned submarines and naval observatories.

Technology Overview:

The lithium-seawater battery is made of two compartments: the anode compartment, which encloses the metal in the non-aqueous electrolyte, and the cathode compartment, which contains porous and electrically conductive materials and seawater.  A solid-state metal-ion conductive membrane is used to separate the two compartments. Inlets and outlets for seawater flow channels are installed in the cathode compartment and a mechanical pump is used to control and pump seawater into the compartment.

The theoretical energy density of a Li-seawater flow battery is about 11.6 kWh/kg while the cost for replacing the lithium in the anode is about $1.2/kWh.  This makes the volumetric energy density of lithium-seawater flow battery about 2 kWh/L or 2,000 kWh/m^3, which is 0.0005 m^3/kWh.

http://buffalo.technologypublisher.com/files/sites/7452_image.png

Advantages:

The lithium-seawater battery can deliver over specific energy of 4,000 Wh/kg, which is much greater than that of any electrochemical energy storage system including hydrogen fuel cells.

Applications:

Emergency backup power on underwater vehicles or other naval equipment

Intellectual Property Summary:

Provisional patent 63/300,251 filed 1/17/2022  

Stage of Development:

TRL 2

Licensing Status:

Not licensed.

Licensing Potential:

Available for licensing on conversion.

Website:

https://suny.technologypublisher.com/tech/Lithium-Seawater_Battery_for_Backup_Power_on_Underwater_Vehicles

TTO Home Page: https://suny.technologypublisher.com

Name: Evan Witmer

Title: Technology Assessment Specialist

Department: Technology Transfer

Email: evanwitm@buffalo.edu

Phone: (716)645-8181