SiO_2包覆花环状Co_3O_4负极材料的合成及电化学性能研究Synthesis and Electrochemical Performances of Wreath-like Co_3O_4@SiO_2 as an Anode Material for Lithium-ion Batteries
刘国镇;林志雅;洪礼训;池毓彬;陶剑铭;林应斌;
摘要(Abstract):
利用溶剂热法制备了花环状Co_3O_4材料,并通过低温水解正硅酸乙酯工艺在Co_3O_4表面沉积SiO_2纳米层.采用XRD、FTIR、SEM、EDS、BET技术对材料的结构和形貌进行表征;应用充放电测试、循环伏安法和电化学阻抗对材料的电化学性能进行细致研究.结果表明,SiO_2颗粒均匀包覆在花环状Co_3O_4表面,SiO_2包覆显著改善了Co_3O_4复合材料的循环稳定性.循环稳定性的改善主要归因于SiO_2包覆可以有效缓解锂离子嵌入脱出过程中Co_3O_4的体积膨胀,进而改善了锂离子的扩散动力学行为.
关键词(KeyWords): 锂离子电池;Co3O4;SiO2;花环状;水解
基金项目(Foundation): 中央引导地方科技发展专项(2018L3006)
作者(Authors): 刘国镇;林志雅;洪礼训;池毓彬;陶剑铭;林应斌;
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