Hydrothermal synthesis of spindle-like Li2FeSiO4-C composite as cathode materials for lithium-ion batteries

• Published in: Journal of energy chemistry Vol. 23; no. 3; pp. 274 - 281
• Main Authors: Gao, Haiyan, Hu, Zhe, Zhang, Kai, Cheng, Fangyi, Tao, Zhanliang, Chen, Jun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2014; Elsevier
• Subjects: Applied sciences; cathode material; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; hydrothermal synthesis; Li2FeSiO4-C composite; lithium-ion battery; spindle like; 复合材料; 放电容量; 正极材料; 水热合成; 电极性能; 纺锤状; 葡萄糖溶液; 锂离子电池; Li2FeSiO4-C composite; spindle like; hydrothermal synthesis; cathode material; lithium-ion battery; Lithium ion batteries; Electrode material; Discharge charge cycle; Composite material; Surface structure; Characterization; FeSiO; Composite electrode; Raman spectrometry; Li; Electrical characteristic; Lithium Silicates; Modified material; Scanning electron microscopy; Cathode; Secondary cell; Carbon; X ray diffraction; C composite; Iron Silicates; Transmission electron microscopy; Hydrothermal synthesis; Morphology; Electrochemical impedance spectroscopy
• ISSN: 2095-4956
• DOI: 10.1016/S2095-4956(14)60147-9

In this paper,we report on the preparation of Li2FeSiO4,sintered Li2FeSiO4,and Li2FeSiO4-C composite with spindle-like morphologies and their application as cathode materials of lithium-ion batteries.Spindle-like Li2FeSi04 was synthesized by a facile hydrothermal method with（NH4）2Fe（SO4）2 as the iron source.The spindle-like Li2FeSiO4 was sintered at 600 ℃ for 6 h in Ar atmosphere.Li2FeSiO4-C composite was obtained by the hydrothermal treatment of spindle-like Li2FeSiO4 in glucose solution at 190 ℃ for 3 h.Electrochemical measurements show that after carbon coating,the electrode performances such as discharge capacity and high-rate capability are greatly enhanced.In particular.Li2FeSiO4-C with carbon content of 7.21 wt%delivers the discharge capacities of 160.9 mAh·g-1 at room temperature and 213 mAh·g-1 at45℃（0.1 C）,revealing the potential application in lithium-ion batteries.