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i h s p Energies 2022, 15, 8086 for the K–CS, Na–CS, and Zn–CS cells are 87, 56, and 26 Ω respectively, which sign that the sodium ions migrate easily during the cycling process. The frequency from to medium semicircle could be evinced for the K–CS, Na–CS, and Zn–CS material their low charge transfer resistance, which leads to the noticeable electrochemical formance of CSHC. When compared to these materials (K–CS, Na–CS, Zn1–8 CofS20) the Zn has low Rs value. Hence, it has the best electrochemical performance for SIBs. Figure 14. Nyquist plot of K-CS, Na-CS, Zn-CS. Figure 14. Nyquist plot of K-CS, Na-CS, Zn-CS. 4. Conclusions In this exertion, the CSHC has been successfully synthesized by a simple pyrolysis methIondtahnidsmexaedretiaopno,rtohues sCtrSuHctCurehuasinbgeevnarisouucscaecstsivfuatlilnygsaygnetnhtses(KizOeHd,bNyaOaHsi,manpdle pyrol ZnCl ). The CSHC anode exhibit better electrochemical performance that can meet the meth2od and made a porous structure using various activating agents (KOH, NaOH, necessities of large-scale commercial applications. The above-obtained results confirm the high initial coulombic efficiency and durability behavior of the HC material. The CSHC anode discloses the initial charge capacity of 141 mAh g−1, 153 mAh g−1, and 162 mAh g−1 at a 1 C rate. The material has low surface areas (153.3 m2/g, 79.240 m2/g, 20.78 m2/g) with a high initial coulombic efficiency of 98.8%, 99.3%, and 99.5%, even after 100 cycles. These tremendous properties suggests that CSHC is one of the most proficient anode materials for large-scale SIBs applications. Author Contributions: Conceptualization, M.T., S.R., and S.M.; data curation, M.T., S.R., and S.M.; formal analysis, M.T., S.R., and S.M.; funding acquisition, S.R. and S.M.; investigation, M.T., S.R., and S.M.; methodology, M.T., S.R., and S.M.; project administration, S.R. and S.M.; resources, S.R. and S.M.; software, S.R. and S.M.; supervision, S.R. and S.M.; validation, M.T., S.R., and S.M.; visualization, S.R. and S.M.; writing—original draft, M.T., S.R., and S.M.; writing—review and editing, M.T., S.R., and S.M. All authors have read and agreed to the published version of the manuscript. Funding: All the authors from Alagappa University acknowledge the financial support by DST SERB, New Delhi, India under the Physical sciences, grant sanctioned vide EMR/2016/006302 and Ministry of Human Resource Development RUSA- Phase 2.0 grant sanctioned vide Lt.No.F-24-51/2014 U Policy (TNMulti Gen), Dept. of Education, Govt. of India. Data Availability Statement: Not Applicable. Conflicts of Interest: All the authors declare that there is no conflict of interest. References 4. Conclusions 1. Xiao, B.; Rojo, T.; Li, X. Hard carbon as sodium-ion battery anodes: Progress and challenges. Chem. Sus. Chem. 2019, 12, 133–144. [CrossRef] [PubMed] 2. Malik, A.W. Targeted Synthesis of Functional Soft and Hard Carbons from Bio-Waste and Natural Products for Supercapacitor and Battery Applications; CSIR-National Chemical Laboratory: Pune, India, 2016. 3. Thomson, M.; Xia, Q.; Hu, Z.; Zhao, X.S. A review on biomass–derived hard carbon materials for sodium-ion batteries. Mater. Adv. 2021, 2, 5881–5905. [CrossRef] 4. Lach, J.; Wrobel, K.; Wrobel, J.; Czerwinski, A. Applications of carbon in rechargeable electrochemical power sources: A review. Energies 2021, 14, 2649. [CrossRef]PDF Image | Morphology Derived Coconut Sheath for Sodium-Ion Battery
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