High quality graphitized graphene as an anode material for lithium ion batteries

Abstract

High quality graphitized graphene has been successfully synthesized by solid-exfoliation of graphite and a subsequent wet chemical process. The as-obtained graphene exhibits charge-discharge behaviour quite different from that of reduced graphene oxide and shows enhanced cycling and rate performance compared with commercial mesocarbon microbeads (MCMBs) for lithium ion batteries.

Collector and binder-free high quality graphene film as a high performance anode for lithium-ion batteries

“…14 Fig. 3a shows the rst three cyclic voltammetry (CV) curves of the as-obtained graphene lm in the voltage of 0.01-3.0 V at a scan rate of 1 mV s À1 , which is consistent with that of graphene 11 and MCMB ( Fig. S2 in the ESI †).…”

“…The schematic synthesis process and the structural characterization such as SEM, TEM, XRD, Raman and XPS of graphene sheets (GS) have been described in detail in our previous work. 11 The thickness of the graphene used in this work was estimated to be less than 5 layers according to the 2D band ($2700 cm À1 ) which is characteristic of few layer graphene ( Fig. S1 in the ESI †).…”

Graphene Acid for Lithium‐Ion Batteries—Carboxylation Boosts Storage Capacity in Graphene

“…These values were significantly lower than that of GA (800 mAh g −1 , Figure 2d). The charging/discharging of graphene nanoplatelets was found similar to that expressed by small-crystal graphite [63] (indicating its multilayered nature) and suffered from severe capacity decay to ≈50 mAh g −1 at 1.5 A g −1 (Figure S8a, Supporting Information) The monolayer graphene performed better, keeping 250 mAh g −1 at 1.5 A g −1 (Figure S8b, Supporting Information). The GA anode at comparable electrode material loading delivered higher capacity than monolayer graphene at all current rates (Figure S8c, Supporting Information), which is particularly interesting considering the much higher conductivity of pristine graphene.…”

A Practical Li-Ion Full Cell with a High-Capacity Cathode and Electrochemically Exfoliated Graphene Anode: Superior Electrochemical and Low-Temperature Performance

“…43 In our previous paper, we reported a graphene anode material by wet chemical exfoliation, exhibiting superior electrochemical performance at room temperature. 44 Electrochemically exfoliating the natural graphite foil in an electrochemical cell can yield 10 g of high quality EG per hour (easily scalable). The lateral size of the obtained EG is several micrometers and the average thickness is ∼1.5 nm (Figure 3a, b).…”

“…From a practical view, two-dimensional graphene has been verified as a promising alternative to graphite anode material . In our previous paper, we reported a graphene anode material by wet chemical exfoliation, exhibiting superior electrochemical performance at room temperature …”