HPQ Silicon’s industrial GEN4 21700 cells surpass 7,000 mAh

HPQ Silicon has announced a significant breakthrough in battery technology with its 21700 cylindrical cells incorporating Novacium SAS’s GEN4 silicon-based anode material. These cells have achieved a discharge capacity exceeding 7,000 mAh, specifically reaching 7,030 mAh, which is notably higher than the typical 4,800 to 5,000 mAh range found in commercially available 21700 graphite cells. This milestone positions HPQ’s cells among the highest capacity industrial 21700 format batteries reported to date, according to publicly available data. The enhanced performance was demonstrated under a modified deep-discharge cycling protocol, utilising a lower voltage cutoff of 0.55 V rather than the industry-standard 2.5 V. Such a low voltage cutoff would ordinarily cause irreversible damage in conventional graphite or silicon-based cells. However, the GEN4 material sustained 70 full cycles with less than 2% capacity degradation, signalling exceptional stability and durability. This suggests that the operating voltage range of GEN4 lithium-ion cells can be extended beyond traditional limits, offering new possibilities for high-energy-density applications where maximising capacity per unit volume is critical. Bernard Tourillon, President and CEO of HPQ Silicon, emphasised the significance of breaking the 7,000 mAh barrier in an industrial-format 21700 cell, highlighting that this achievement has not been widely documented under comparable conditions. He also pointed out the importance of maintaining cycle stability during testing, which indicates that the GEN4 material can function effectively under extended conditions that typically cause rapid degradation in standard graphite-based lithium-ion cells. This resilience could pave the way for more robust and longer-lasting batteries in various sectors. HPQ Silicon holds exclusive North American commercialisation rights for Novacium’s GEN3 and GEN4 silicon-based battery materials under its HPQ ENDURA+ brand. The company’s advancements in silicon-anode technology underscore a growing trend in the battery industry towards materials that enhance energy density and cycle life. As the demand for higher-capacity, durable batteries continues to rise, particularly in electric vehicles and portable electronics, HPQ’s developments could have significant implications for future battery design and performance standards.