水解法制备SnO2纳米材料及作为锂离子电池负极的性能研究
SnO2 nanoparticle prepared by hydrolysis method for the lithium-ion battery anode
云南民族大学学报:自然科学版,2016,25(5):388-392

冯莉莉 FLL

摘要


分别使用十二烷基苯磺酸钠(SDBS)作为表面活性剂以及十二烷基苯磺酸钠(SDBS)和聚乙烯吡咯烷酮(PVP)作为双表面活性剂,采用水解法制备出SnO2纳米材料,并研究了SnO2纳米材料的形貌和作为锂离子电池负极时的电化学性能之间的关系.结果表明,所制备的SnO2纳米颗粒均为球形,大小为45~75nm,在双表面活性剂的调控下所制备的SnO2纳米材料体积较大.所制备的SnO2纳米颗粒均为具有金红石结构的锡石型,属于四方晶系.恒电流充放电循环测试结果表明,SnO2纳米颗粒具有较高的放电比容量,首次放电比容量大约为1400~1600mAh/g, 但是循环稳定性较差,循环5次以后样品的放电比容量衰减至400~700mAh/g. 总之,双表面活性剂调控下,7h 煅烧制备得到的SnO2纳米材料相对较好,具有相对较大的比容量和相对较小的阻抗. SnO2 nanoparticle is successfully prepared by the hydrolysis method. Herein two kinds of surfactants, sodium dodecyl benzene sulfonate (SDBS) and poly(vinylpyrrolidone) (PVP-40) are investigated to reveal the relations of the SnO2 nanoparticle morphology and its electrochemical performance. No matter SDBS or PVP is used, the SnO2 nanoparticles are spheric in the morphology with about 45—75nm in diameter. The SnO2 nanoparticles prepared under the control of dual surface active agent have relatively large volume. All the SnO2 nanoparticles arecassiterite type with rutile structure and belong to tetragonal crystal system.The results of galvanostatic charge-discharge cycling test show that the SnO2 nanoparticle has a high initial discharge specific capacity as approximate 1400—1600 mAh/g, but the cycling stability is poor, after five cycling the discharge specific capacity fell to 400—700 mAh/g. In summary, the SnO2 nanoparticle prepared by the regulation of dual surfactants and shorter calcination time is better as for relativelyhigh discharge specific capacity and low impedance.

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