Envia Systems, a developer of lithium-ion energy-storage solutions, says its rechargeable battery has achieved an energy density of 400 Wh/kg. When commercialized, this battery is expected to reduce the cost of a 300-mile-range electric vehicle by cutting the cost of the battery pack by more than 50%, the company says.
The testing of the battery was performed by the Electrochemical Power Systems Department at the Naval Surface Warfare Center (NSWC) in Crane, Ind., under the sponsorship of the U.S. Department of Energy's Advanced Research Projects Agency-Energy (ARPA-E).
Tests at various cycling rates at NSWC confirmed that Envia's automotive battery cell demonstrated an energy density between 378 Wh/kg and 418 Wh/kg for rates between C/3 to C/10 for a 45 ampere/hour (C/3) cell. Similar cells have been cycling in Envia's test labs for over 300 cycles. NSWC Crane will also test these cells to validate cycling performance.
"We hope that this low-cost and high-density battery technology enables widespread adoption of electric vehicles across the country and around the world," says Arun Majumdar, director of ARPA-E.