Using its SemiSolid lithium-ion battery design with a silicon anode in its pilot facility, 24M achieved energy densities of 280Wh/kg, exceeding the 250Wh/kg that is the current state-of-the-art industry benchmark for electric vehicles.
The development of the high energy density nickel manganese cobalt (NMC) cells is part of a $7M three-year contract awarded to 24M in 2016 by the United States Advanced Battery Consortium in cooperation with the U.S. Department of Energy. Europe has a similar programme,
The US program is developing electrochemical energy storage technologies that support the commercialization of hybrid, plug-in hybrid, electric and fuel cell vehicles. To achieve the final USABC 2020 density target of 350 Wh/kg by the end of 2019, 24M developed a multi-faceted, lab-proven approach that includes a novel use of silicon for high energy density anodes.
24M also delivered similar NMC cells with energy densities above 280 Wh/kg to an industrial partner. With these cells, the higher energy densities were achieved by optimizing 24M’s SemiSolid electrode technology, which eliminates the use of a pore-clogging binder, enabling higher active material densities than can be achieved with conventional electrodes. The demonstration of this technology is a major milestone on the 24M roadmap to achieving even higher energy densities (>400 Wh/kg) using its capital-efficient manufacturing process.
“It’s very gratifying to see science translated from the lab into innovative new products as 24M has done by developing and delivering these high energy density cells,” said Naoki Ota, CTO of 24M. “Moreover, we were able to leverage our novel electrode, cell and manufacturing approach to exceed 280 Wh/kg, a significant step towards delivering low-cost lithium-ion cells with industry-leading performance to the EV market.”