Simultaneous Enhancement of the Performance and Stability of MnO₂ Based Lithium Ion Battery Anodes by Compositing with Fluorine Terminated Functionalized Graphene Oxide

Abstract

Metal oxide based anodes for lithium ion batteries should theoretically exhibit high specific capacities, but their disappointing experimentally measured capacities and cycle stabilities inhibit their usages in the commercial and industrial level. Here, we propose a simple method to process the MnO 2 / 2,2,3,3,4,4,4-Heptafluorobutylamine-functionalized-grapheneoxide(HFBA-fGO) composite anode, in which HFBA-fGO is composited with the MnO 2 based anode to simultaneously enhance the specific capacity to reach the theoretical capacity of MnO 2 and improve the cyclic stability significantly. In fact, the MnO 2 /HFBA-fGO composite anode exhibits high performance with specific capacity of 1030 mAhg À1 under 100 mAg À1 and stable cyclic performance at least up to 200 cycles of repeated charging and discharging even at a high rate of 1 A g À1 . A detailed analysis of the enhanced cyclic stability of the composite anode is performed through the investigation of the electrode-electrolyte interfaces using the electrochemical impedance spectroscopy and cyclic voltammetry. Such results were possible because of the significantly suppressed irreversible formation of the surface passivation layer caused by the fluorine-rich terminal groups of the HFBA-fGO, which leads to enhanced cyclic stability. We believe that this method should be effective even for other various metal-oxide anodes besides MnO 2 as well, which certainly broadens the potential use of HFBA-fGO.

Tremella‐shaped TiCN Nanosheets as Anode mAterials of Lithium‐Ion Batteries

“…The anode mAterial is especially of interest. The anode mAterials commonly used in current research such as graphite‐based mAterials, [1] alloy mAterials, [2] silicon‐based mAterials, [3] partial metal oxides, [4] which mAy possess slow reaction kinetics or the excessive volume expansion/contraction during the charging/discharging processes. Consequently, obtaining a new electrode mAterial with excellent cycle performance is crucial.…”