An old coconut shell as a green biomass was known as a potential carbon materials for rGO and cost effectiveness. The objective of this study is synthesizing an rGO-like carbon (C) compound from coconut shells and inserting into LiFePO4 (LFP), as Li-ion battery cathode. Thus, an LFP/rGO nanocomposite was successfully fabricated using an unconventional approach which is the combination of the sol–gel technique and mechanical ultracentrifugation. LiFePO4 precursors were prepared from commercial starting materials, using the sol–gel technique, and the composites’ carbon weight content was varied between 15 and 30%. This process was subsequently followed by evaluating the microstructural characteristics and electrochemical properties as cathode for the Li-ion batteries. The results showed a high tendency of achieving maximum efficiency with merged LFP and rGO, although LFP molecules appear scattered but are firmly attached to each rGO structure, acting as a "bridge" between the surrounding particles. This reduced graphene oxide (rGO) link is relatively effective in limiting LFP grain growth as well as expanding the surface area, leading to a declined Li-ion diffusion rate. Consequently, the bridge presence also demonstrated a significant effect by enhancing the conductivity, electrical capacity, and performance of the LFP/rGO cycle than pure LFP. Furthermore, the percentage ratio of the synthesized LFP/rGO cathode (85:15) attained higher cycle capacity, compared to 70:30 on the level of 0.1 C, with specific discharging average of 128.03 mAhg−1 and retention capacity of 97.75% after 50 cycles, at room temperature and a rate of 0.1 C.
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The authors would like to thank the Indonesian Endowment Fund for Education (LPDP) from the Indonesian Ministry of Finance for a full-ride scholarships through the BUDI-DN Doctorate program (ES) and PDUPT Research Grant (D) (20161141020723), 2021. We would also like to thank the Laboratory of Microelectronics and Laboratory of Institute of Nanoelectronics Engineering, University of Malaysia Perlis.
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Suarso, E., Setyawan, F.A., Subhan, A. et al. Enhancement of LiFePO4 (LFP) electrochemical performance through the insertion of coconut shell-derived rGO-like carbon as cathode of Li-ion battery. J Mater Sci: Mater Electron 32, 28297–28306 (2021). https://doi.org/10.1007/s10854-021-07206-5