https://scholars.lib.ntu.edu.tw/handle/123456789/576257
標題: | Agar-assisted sol-gel synthesis and electrochemical characterization of TiNb2O7 anode materials for lithium-ion batteries | 作者: | Lu C.-H Li K.-C Balaji S Kumar P.S. CHUNG-HSIN LU |
關鍵字: | Algae; Anodes; Calcination; Electric discharges; Electrolytes; Ions; Lithium-ion batteries; Morphology; Niobium; Niobium compounds; Powders; Sol-gel process; Sol-gels; Titanium compounds; Agar-assisted sol-gel process; Anode material for lithium ion batteries; Capacity; Electrochemical surface area; Ion batteries; Lithium ions; Niobium based anode; Sol'gel; Solid state method; Synthesised; Polysaccharides | 公開日期: | 2021 | 卷: | 47 | 期: | 13 | 起(迄)頁: | 18619-18624 | 來源出版物: | Ceramics International | 摘要: | TiNb2O7 powders are synthesized via a newly developed agar-assisted sol-gel process for the first time. Phase-pure TiNb2O7 powders are obtained upon calcination at 800 °C. On contrast, TiNb2O7 powders synthesized via the conventional solid-state method require high calcination temperature at 1100 °C for the complete compound formation. The samples synthesized with agar improve the morphology with submicron-sized particles. The formed porous structure is favorable for enhancing the electrochemical kinetics due to the large contact area between the electrode and the electrolyte. Based on the electrochemical active surface area analysis, the electrical double-layer capacitance of TiNb2O7 powders synthesized via both the agar-assisted and the solid-state method is 145 mF cm?2 and 22 mF cm?2, respectively. The electrochemical active surface area of the sample prepared via the agar-assisted method is higher than that of the sample prepared via the solid-state method. The TiNb2O7 sample synthesized via the agar-assisted process yields 284 mAh g?1 at 0.1 C, whereas the sample synthesized via the conventional solid-state method yields only 265 mAh g?1 at 0.1 C. The discharge capacities of the agar-assisted synthesized sample are 205 mAh g?1 and 174 mAh g?1 at 5 C and 10 C, respectively. Moreover, the sample exhibits high capacity retention of 91% after 100 discharge-charge cycles at 5 C. Based on the obtained results, the agar-assisted sol-gel process is inferred as one of the facile methods for preparing high performance anode materials for lithium-ion batteries. ? 2021 Elsevier Ltd and Techna Group S.r.l. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103317956&doi=10.1016%2fj.ceramint.2021.03.193&partnerID=40&md5=7edeba025463e11c437f6a7c7e19d611 https://scholars.lib.ntu.edu.tw/handle/123456789/576257 |
ISSN: | 2728842 | DOI: | 10.1016/j.ceramint.2021.03.193 | SDG/關鍵字: | Algae; Anodes; Calcination; Electric discharges; Electrolytes; Ions; Lithium-ion batteries; Morphology; Niobium; Niobium compounds; Powders; Sol-gel process; Sol-gels; Titanium compounds; Agar-assisted sol-gel process; Anode material for lithium ion batteries; Capacity; Electrochemical surface area; Ion batteries; Lithium ions; Niobium based anode; Sol'gel; Solid state method; Synthesised; Polysaccharides |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。