Effect of rGO loading on the electrochemical performance of Li ₂₂ Si ₅ / rGO composite anodes for lithium‐ion batteries

Abstract

In this work, as an alternative to the silicon-based anodes, Li 22 Si 5 /rGO composite electrodes were synthesized and their electrochemical performances were investigated by the electrochemical impedance spectroscopy, cyclic voltammetry, and charge/discharge tests. The effects of rGO and PVDF contents on the performance of the composite electrodes were also observed.Although the composite electrodes with the low PVDF content exhibited a high discharge capacity, their cyclic performances were very poor. The excess amount of PVDF content, however, even in the presence of high rGO content, caused the charge transfer resistance and the discharge capacity irreversibility to increase in the composite electrodes. The composite electrode with 70% Li 22 Si 5 alloy, 15% rGO, and 15% PVDF (LSRGO15) contents exhibited the best electrode performance in this work. The LSRGO15 electrode had 822 mA h g À1 discharge capacity at the 100th cycle. These performance values demonstrated that Li 22 Si 5 /rGO composite electrodes were highly promising as the alternative anode materials for the LIBs.

Synthesis and characterization of magnesium ferrite-activated carbon composites derived from orange peels for enhanced supercapacitor performance

“…In the contemporary era, iPads, mobile phones, and personal computers are electronic devices relying on energy storage technologies, such as batteries, that enhance our daily lives and enable efficient access to information and communication 1 , 2 . Electrochemical capacitors, or supercapacitors (SCs), offer tremendous potential for energy storage due to their high efficiency, high power densities, extended cycle lives, environmental friendliness, and safety 3 , 4 . These devices have proven useful in various applications, including providing burst-power generation for electronic devices, initiating power for fuel cells, acting as backup power sources, and contributing to hybrid power systems 5 , 6 .…”

Ultrasound-assisted synthesis of rGO/SiO2-based nanosheets and their electrochemical performances in Li-ion batteries

“…GO was synthesized by an improved method, which has been reported by our previous study [ 9 ]. According to this method, the mixture of acids, H 2 SO 4 :H 3 PO 4 (360:40 mL), was slowly added into a mixture of KMnO 4 (18.0 g) and graphite flakes (3.0 g).…”