Incommensurateness of graphene layers boosts the capacity of storing lithium

Tereza M. Paronyan
Hexalayer, LLC, Kentucky, United States

Keywords: Li-ion battery, high capacity, graphene, incommensurate layers, CVD techinque

Current commercial LBS based on graphite anodes do not possess high capacities due to low lithium diffusion within commensurately-stacked graphene layers consisting the graphite. Here, we present a new type of graphene structures with unique structural and physical properties with the capability to store a high amount of Lithium. Commercial Ni powder as a catalyst and the methane gas as a Carbon source were used to grow and scale-up the graphene. Thin graphene 3D network consists of incommensurately-stacked high-quality few layers. This network demonstrates up to 1604 mAh/g capacity of storing lithium. The study of Lithium intercalation has revealed that all galleries of multilayer graphene are penetrated by Lithium due to weakly interlayer interaction which is a result of incommensurateness. A new mechanism offers up to 1674 mAh/g capacity in the bilayer configuration. The unique properties allow a flexible adjustment of the graphene layers for a long-term stable cycling in LIBs. 1540 mAh/g reversible capacity is achieved throughout 100 cycles with over 95% of retained capacity between 2nd and 100th cycles. In fact, over six times effective capacity is achieved compared to graphite cells promising the feasibility of the rapid development of lightweight, cost-efficient, high-capacity rechargeable batteries based.