T. Paronyan
HeXalayer, LLC,
United States
Keywords: rotated graphene, high capacity, Li-ion battery
Summary:
The rapidly growing market for Li-ion batteries (LIB) is driven by the demand for many applications including electric vehicles, Unmanned Aerial Systems (UAS), connected and IoT-based devices, and many other mobile electronic devices. Besides the many advances such as high Voltage, long-term cycling, and safety, the present LIB technology that uses graphitic anode chemistry, is still lacking in terms of high energy density and high power for a long lifetime safe cycling. The lack of high energy density is driven in large part by the low capacity of graphite (theoretically, 372 mAh/g), not allowing it to store higher density charges transferred by Lithium between two working electrodes. HeXalayer has developed an innovative graphene technology with a six-fold (~over 1,800 mA.h/g) specific-capacity of Graphite. The unique electronic structure of rotated graphene that creates weakened interlayer interaction provides a large amount of Lithium intercalation reversibly, a provides stable kinetics for long-term cycling with over 98% retained capacity. Due to its superior high capacity, the implementation of this graphenic anode into the full battery technology also requested modification of cathode (NMC, LFP) chemistry suitable for this graphene. We discussed the challenges and the pathway to overcoming the successful integration of this higher-capacity anode. HeXalayer’s technology aims to bring a new class of carbon anode and rechargeable battery technologies to the market that would deliver 500Wh/kg and even higher energy density safer LIBs with longer lifetimes. Related Publications • T. M. Paronyan et al. NATURE, SR 7, (2017). • T. M. Paronyan et al. ECST 77, 311 (2017). • T.M. Paronyan, JMR 36, 2872–2880 (2021). Related Patent: Tereza M. Paronyan “GRAPHENE NETWORKS AND METHODS FOR SYNTHESIS AND USE OF THE SAME” Patent number: 11718529, Date of Patent: August 8, 2023.