AUTHOR=Esteve-Adell Iván , Porcel-Valenzuela María , Zubizarreta Leire , Gil-Agustí Mayte , García-Pellicer Marta , Quijano-Lopez Alfredo 

TITLE=Influence of the Specific Surface Area of Graphene Nanoplatelets on the Capacity of Lithium-Ion Batteries

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.807980

DOI=10.3389/fchem.2022.807980

ISSN=2296-2646

ABSTRACT=In order to understand the influence of the morphological properties of graphene materials on the electrochemical performance of electrodes for lithium ion batteries, three different graphene nanoplatelets with increasing specific surface area (NP1: 296 m2 g-1; NP2: 470 m2 g-1 and NP3: 714 m2 g-1) where added in the electrode formulation in different ratios. Higher specific surface area graphene nanoplatelets (NP3) exhibit reversible capacity up to 505 mA h g-1 in the first discharge cycle (29,5% higher than graphite). Although significant irreversible capacity is shown for NP3, still higher reversible capacity is obtained compared to graphite electrode. The presence of micropores in graphene structure we found that benefits the lithiation. C-rate capability tests also shows better performance for the graphene based electrode. In this work we demonstrate that graphene nanoplatelets with high specific surface area (714 m2 g-1) improve the electrochemical performance of Li-ion battery electrodes. The relationship between specific surface area, the presence of defects and porosity are discussed.