Characteristics of a Graphene Nanoplatelet Anode in Advanced Lithium‐Ion Batteries Using Ionic Liquid Added by a Carbonate Electrolyte

Abstract

A Cu‐supported, graphene nanoplatelet (GNP) electrodes are reported a as high performance anode in lithium ion battery. The electrode precursor is an easy‐to‐handle aqueous ink cast on cupper foil and following dried in air. The scanning electron microscopy evidences homogeneous, micrometric flakes‐like morphology. Electrochemical tests in conventional electrolyte reveal a capacity of about 450 mAh g−1 over 300 cycles, delivered at a current rate as high as 740 mA g−1. The graphene‐based electrode is characterized using a N‐butyl‐N‐methyl‐pyrrolidiniumbis (trifluoromethanesulfonyl) imide, lithium‐bis(trifluoromethanesulfonyl)imide (Py1,4TFSI–LiTFSI) ionic liquid‐based solution added by ethylene carbonate (EC): dimethyl carbonate (DMC). The Li‐electrolyte interface is investigated by galvanostatic and potentiostatic techniques as well as by electrochemical impedance spectroscopy, in order to allow the use of the graphene‐nanoplatelets as anode in advanced lithium‐ion battery. Indeed, the electrode is coupled with a LiFePO4 cathode in a battery having a relevant safety content, due to the ionic liquid‐based electrolyte that is characterized by an ionic conductivity of the order of 10−2 S cm−1, a transference number of 0.38 and a high electrochemical stability. The lithium ion battery delivers a capacity of the order of 150 mAh g−1 with an efficiency approaching 100%, thus suggesting the suitability of GNPs anode for application in advanced configuration energy storage systems.

Sandwich‐like MoS2@SnO2@C with High Capacity and Stability for Sodium/Potassium Ion Batteries

“…The initial discharge capacity is 595 mA h g −1 with a coulombic efficiency of 67.99%. The irreversible loss may result from the formation of SEI film . The rate capacities of the MoS 2 @SnO 2 @C electrode are illustrated at various current densities from 0.05, 0.1, 0.2, 0.5, 0.8, 1, and 2 A g −1 , as shown in Figure c.…”

“…The irreversible loss may result from the formation of SEI film. [56][57][58] The rate capacities of the MoS 2 @SnO 2 @C electrode are illustrated at various current densities from 0.05, 0.1, 0.2, 0.5, 0.8, 1, and 2 A g −1 , as shown in Figure 6c. They deliver initial reversible discharge capacities of 595, 401, 379, 336, 294, 257, and 168 mA h g −1 , respectively.…”

Lithium-ion batteries for sustainable energy storage: recent advances towards new cell configurations

“…An interesting lithium-ion cell characterized by relevant safety content was formed by coupling LFP cathode with a graphene nanoplatelet (GNP) anode prepared by an easy-to-handle aqueous ink cast on cupper foil, in N-butyl-N-methyl-pyrrolidinium-bis (trifluoromethanesulfonyl) imide, lithium bis(trifluoromethanesulfonyl)imide, ethylene carbonate, dimethyl carbonate (Pyr1,4TFSI-LiTFSI-EC-DMC) electrolyte. 102 The GNP/LFP battery delivered a capacity of the order of 150 mAh g −1 at 2.4 V, with an efficiency approaching 100%.…”

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

“…Different kinds of graphene (i.e., prelithiated RGO, [ 405 ] CVD-synthesized graphene [ 406,407 ] and prelithiated commercial graphene [ 408 ] ) were used as active material and coupled with LiFePO 4 or LiCoO 2 cathodes (Table 3 ). Particularly, in the work of J. Morales et al, [ 405 ] two pre-lithiation methods were used and compared (i.e., electrochemical lithiation and Li-foil contact lithiation in the presence of an electrolyte).…”