Title: 

A surface modification strategy towards reversible Na-ion intercalation on graphitic carbon using fluorinated few-layer graphene

Year of Publication:

2022

Authors:

Dipobrato Sarbapalli, Yu-Hsiu Lin, Sean Stafford, Jangyup Son, Abhiroop Mishra, Jingshu Hui, A Nijamudheen, Adolfo IB Romo, Zachary T Gossage, Arend M van der Zande, Jose L Mendoza-Cortes, Joaquín Rodríguez-López

Journal:

Journal of The Electrochemical Society

Abstract:

Na-ion batteries (NIBs) are proposed as a promising candidate for beyond Li-ion chemistries, however, a key challenge associated with NIBs is the inability to achieve intercalation in graphite anodes. This phenomenon has been investigated and is believed to arise due to the thermodynamic instability of Na-intercalated graphite. We have recently demonstrated theoretical calculations showing it is possible to achieve thermodynamically stable Na-intercalated graphene structures with a fluorine surface modifier. Here, we present experimental evidence that Na+ intercalation is indeed possible in fluorinated few-layer graphene (F-FLG) structures using cyclic voltammetry (CV), ion-sensitive scanning electrochemical microscopy (SECM) and in situ Raman spectroscopy. SECM and Raman spectroscopy confirmed Na+ intercalation in F-FLG, while CV measurements allowed us to quantify Na-intercalated F-FLG …

URL:

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.106.L201109