Core–shell CeO₂ micro/nanospheres prepared by microwave-assisted solvothermal process as high-stability anodes for Li-ion batteries

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• 作者：Haowen Liu ; Hefen Liu ; Xiaoyan Han
• 关键词：Lithium ; ion batteries ; Microwave ; assisted ; Core ; shell ; CeO2 ; Electrochemical performances
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：21
• 期：1
• 页码：291-295
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1433-0768
• 卷排序：21

文摘

Core–shell CeO₂ micro/nanospheres are prepared via microwave-assisted solvothermal process followed by calcination in air. The reaction time is only 30 min. Structure information, phase, and morphologies of the as-synthesized powder are characterized by X-ray diffraction (XRD), scan electron microscope (SEM), and transmission electron microscope (TEM), respectively. The heterogeneous contraction originated from the non-equilibrium heat treatment may be responsible for the formation of core-shelled structure. Charge–discharge test and electrochemical impedance spectroscopy (EIS) are carried out by using the as-prepared CeO₂ as an anode material for lithium-ion batteries. When tested in 0.01–1.5 V at 0.2 mA cm−2, the initial discharge capacity is 454.2 mAh g−1 and stabilized reversibly at about 327.0 mAh g−1 after 100 cycles. The special core–shell micro/nanostructure is more capable of buffering the volume change, resulting in enhanced electrochemical performances. This exploring about the core–shell micro/nanomaterial may direct a new generation electrode material of Li-ion batteries.