U.S. battery cell developer 24M has expanded the application of its Eternalyte electrolyte, originally designed for lithium-metal batteries, to now include silicon- and graphite-based battery chemistries. The company says the electrolyte significantly improves charging speeds and cold-weather performance.
First unveiled in February 2024, Eternalyte was initially developed to enhance lithium-metal batteries. According to 24M, the electrolyte enables a rapid charging rate, allowing electric vehicles to gain approximately 200 miles (320 km) of range in under four minutes when charging from 15% to 80% state of charge (SOC). It also delivers up to three times the ionic conductivity of standard electrolytes, helping maintain efficiency across different battery types.
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Performance in low temperatures is a key feature, with Eternalyte retaining over 80% capacity at -20°C, whereas conventional electrolytes typically experience capacity losses exceeding 80% under similar conditions. “Originally designed for lithium-metal batteries, we quickly realized that the transformative nature of Eternalyte has far-reaching benefits for all types of batteries,” said Naoki Ota, CEO of 24M. “We are excited to introduce the expanded Eternalyte family, one of the few chemistry innovations that can be implemented immediately to radically improve performance of today’s batteries.”
Volkswagen acquired a 25% stake in 24M in early 2022 but did not participate in the company’s most recent financing round in September 2024. That round, led by Nuovo+, a battery subsidiary of Thailand’s PTT Group, raised $87 million and valued 24M at $1.3 billion.
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