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PolyPlus Battery Company


PolyPlus Battery Company
2424 Sixth Street
Berkeley, CA 94710

Mailing Address:
PolyPlus Battery Company
2431 5th Street, Suite B
Berkeley, CA 94710


 / Fax: 510-841-4313

Organization's Description:

PolyPlus Battery Company

PolyPlus started operations in Berkeley, California in 1991 based on innovations made by two scientists at the Lawrence Berkeley National Laboratory for an environmentally friendly and cost-effective lithium/organosulfur battery. PolyPlus also developed and patented the related lithium/sulfur battery, which has been licensed to a U.S. manufacturer and is now a commercial product.

PolyPlus Battery Company recently made a breakthrough in lithium metal battery 
chemistry involving the use of a patented multi-layer solid electrolyte that chemically isolates the Li electrode from the catholyte, allowing the construction of lithium metal/aqueous batteries with unprecedented energy density. The Company is presently focused on the development of Lithium/Air and Lithium/Seawater batteries which are high-energy, non-toxic, and environmentally friendly. PolyPlus has an extensive patent portfolio covering key aspects of its technology including lithium-sulfur batteries, protected lithium anodes, lithium-air and aqueous-lithium batteries.


PolyPlus Battery Company has developed and patented protected lithium electrodes (PLEs) that are remarkably stable in a broad range of electrolytes, including aqueous and non-aqueous solvents. The invention of the PLE enables the development of a new class of ultra-high energy density batteries including lithium metal semi-fuel cells. PolyPlus encapsulates the lithium metal core using solid electrolyte membranes and a unique compliant seal. The solid electrolyte is highly conductive to lithium ions, but impervious to liquids and gases. In this way, the lithium core is electrochemically active but chemically isolated from the external electrolyte, allowing the construction of lithium-metal/aqueous batteries including lithium/air and lithium/water with unprecedented energy density.

PolyPlus is developing rechargeable and non-rechargeable Li-Air, and Li-Seawater batteries based on protected Li electrodes. At a nominal potential of about 3 volts, the theoretical specific energy for a lithium/air battery is over 5000 Wh/kg for the reaction forming LiOH and 11,000 Wh/kg for the reaction forming Li2O2 or for the reaction of lithium with dissolved oxygen in seawater, rivaling the energy density for hydrocarbon fuel cells and far exceeding Li-ion battery chemistry that has a theoretical specific energy of about 400 Wh/kg. PolyPlus intends to first commercialize non-rechargeable Li/Air and Li/Seawater batteries followed by the introduction of rechargeable Li/Air. The projected energy density and specific energy for commercial Li-Air batteries is on the order of 1000 Wh/l and 1000 Wh/kg. Lithium/Seawater batteries which use the ocean as the positive electrode are even more energy dense and should be introduced commercially at about 1500 Wh/l and 1500 Wh/kg. Li/Air and Li/Seawater batteries are based on non-toxic materials and are environmentally benign.

Phone: 510 841 7242
Fax: 510 841 4313