24M presents new electrolyte for lithium metal batteries

The cell developer is of the opinion that this has achieved the highest cycle stability to date among liquid electrolyte systems at 20mA/cm2 plating/stripping current. According to 24M, a lithium metal cell cycled at 1C discharge/1C charge retains 83 percent capacity with Eternalyte over 500 or more cycles, “providing a total range of more than 500,000 miles (804,672 km) and range of 1,000 miles (1069 km) per charge.”

The loading speed can also be improved. The company states that “test results for lithium-lithium base cells suggest the equivalent of 3,000+ cycles of 4C continuous cycling without shorting or increasing resistance.”

“We are on a mission to deliver transformative battery solutions that overcome critical industry challenges. “Eternalyte plays a key role in achieving this transformation by enabling high cycle life lithium metal batteries,” said Naoki Ota, President and CEO of 24M. “While our solutions can be individually integrated into traditional battery products, we believe the greatest benefits are achieved when they are combined. Together they can deliver a cost-effective and safe battery pack with a range of 1,000 kilometers per charge, enabling electric vehicles to be fully competitive with internal combustion engine vehicles.”

24M chief scientist and MIT professor Yet-Ming Chiang added: “In conventional cell production, the basic manufacturing process has not changed in more than three decades. We have reinvented both the manufacturing process and cell/package design to create a complete range of innovative battery solutions that enable next-generation technologies such as lithium metal.”

24M offers other battery technologies, such as 24M ETOP, which increases the density of battery packs. The abbreviation stands for “Electrode-to-Pack” and means that the electrodes are integrated directly into the battery pack without cells. In January, 24M also introduced the Impervio battery separator, which is intended to improve the safety of lithium-ion and lithium metal batteries. According to the company, it prevents the formation of metal dendrites and electrode displacement and continuously monitors the battery cell, which should enable early fault detection.

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At the beginning of 2022, Volkswagen acquired a 25 percent stake in 24M. The company emerged from the battery manufacturer A123 in 2010. 24M took a big step towards commercializing its semi-solid technology at the beginning of 2021: At that time, a license agreement with the Norwegian company Freyr was announced. Freyr wants to produce battery cells using 24M technology in its battery factory in Mo i Rana, but these are intended to be used in maritime applications and stationary storage.

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