https://scholars.lib.ntu.edu.tw/handle/123456789/407331
標題: | Influence of bio-derived agar addition on the electrochemical performance of LiFePO 4 cathode powders for Li-ion batteries | 作者: | Lu C.-H. Li W.Y. Subburaj T. Ou C.Y. Kumar P.S. |
關鍵字: | Agar;Cathode material;LiFePO 4;Lithium-ion battery;Sol-gel | 公開日期: | 2019 | 卷: | 45 | 期: | 9 | 起(迄)頁: | 12218-12224 | 來源出版物: | Ceramics International | 摘要: | Olivine structured LiFePO 4 cathode materials were successfully synthesized via a newly developed eco-friendly sol-gel process. In this study, bio-derived natural agar powders were used as chelating agents as well as carbon sources for the first time. The impacts of different agar concentrations (3 wt%¡V12 wt%) and calcination temperatures (400 ¢XC¡V700 ¢XC) on the structural and electrochemical properties of LiFePO 4 /C powder were investigated in detail. XRD analysis showed that as the concentration of agar reached 6 wt%, a LiFePO 4 phase was obtained in N 2 atmosphere with 700 ¢XC heating for 8 h. Moreover, increasing the agar concentration to 12 wt% significantly lowered the calcination temperature to 500 ¢XC for the formation of LiFePO 4 phase. Particle size distribution spectra also revealed that addition of up to 12 wt% agar concentration reduced the particle sizes of the as-prepared LiFePO 4 powder. LiFePO 4 powder synthesized with 12 wt% agar concentration at 600 ¢XC exhibited an initial specific discharge capacity of 147 mA h/g at C/10 rate and maintained 146 mA h/g at the end of 50 th cycle in 2¡V4.2 V window, indicating excellent capacity retention. The analysis of electrochemical impedance spectra and CV test indicated that the charge transfer resistance and potential difference were effectively reduced. ? 2019 Elsevier Ltd and Techna Group S.r.l. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407331 | ISSN: | 02728842 | DOI: | 10.1016/j.ceramint.2019.03.128 | SDG/關鍵字: | Algae; Calcination; Cathodes; Charge transfer; Chelation; Electric discharges; Iron compounds; Lithium compounds; Particle size; Particle size analysis; Polysaccharides; Powders; Silicate minerals; Sol-gel process; Agar; Calcination temperature; Cath-ode materials; Charge transfer resistance; Electrochemical impedance spectra; Electrochemical performance; LiFePO4; Specific discharge capacity; Lithium-ion batteries |
顯示於: | 化學工程學系 |
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