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针对Sn O2作为锂离子电池负极材料循环性能和导电性差的问题,采用水热法制备了Sn O2/C复合物。研究了多级结构Sn O2的制备工艺并以此为基础制备了Sn O2/C复合物,通过XRD、SEM、TEM等分析方法表征了材料的结构、组成和形貌;采用循环伏安、恒流充放电等电化学方法表征Sn O2和Sn O2/C复合材料的电化学性能。实验结果表明,在200 m A g-1恒电流密度充放电时,Sn O2/C复合物电极充放电循环50次后比容量为346.1 m A h g-1,远高于Sn O2电极;与此同时,无定形碳的引入使Sn O2/C复合物电极的倍率性能也显著提高。
Aiming at the problem of Sn O2 being poor cycling property and poor conductivity for the negative electrode material of lithium ion battery, a SnO2 / C composite was prepared by hydrothermal method. The preparation process of multistage SnO2 was studied and the SnO2 / C composite was prepared. The structure, composition and morphology of the material were characterized by XRD, SEM and TEM. The cyclic voltammetry Electrochemical properties of SnO2 and SnO2 / C composites were characterized by flow charge and discharge. The experimental results show that the specific capacitance of SnO2 / C composite electrode is 346.1 mA hg-1 after 50 cycles of charging and discharging at a constant current density of 200 m A g-1, which is much higher than that of SnO2 electrode. At the same time, the introduction of amorphous carbon also enhanced the rate capability of SnO2 / C composite electrode.