Preparation and electrochemical performance of SnO2@carbon nanotube core–shell structure composites as anode material for lithium-ion batteries
Preparation and electrochemical performance of SnO2@carbon nanotube core–shell structure composites as anode material for lithium-ion batteries
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DOI：
10.1016/j.electacta.2011.10.055
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发表时间：
2012
影响因子：
6.6
通讯作者：
Hongkun Zhang;Huaihe Song;Xiaohong Chen;Jisheng Zhou;Huijuan Zhang
中科院分区：
文献类型：
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作者：
Hongkun Zhang;Huaihe Song;Xiaohong Chen;Jisheng Zhou;Huijuan Zhang
采用化学活化碳纳米管（CNTs）和湿化学填充法制备了碳纳米管包覆SnO 2（SnO2@CNT）核壳复合负极材料。X射线衍射和透射电子显微镜的测试结果表明，SnO 2填充在碳纳米管的内部中空核中，以直径约为6 nm的小纳米颗粒形式存在。当用作锂离子电池的阳极材料时，SnO2@CNT复合材料在各种电流密度下表现出增强的电化学性能。在0.2mAcm−2（0.1C）下，含有wt. 65%的SnO 2表现出829.5mAhg− 1的可逆比容量，并且在50次循环后保持627.8mAhg− 1。当电流密度为1.0、2.0和4.0mAcm−2（约0.5、1.0和2.0C）时，复合电极仍分别表现出563、507和380 mAhg −1的容量保持率。我们的SnO2@CNT复合材料的容量保持率远高于先前报道的具有相同填充产率的SnO 2/CNT复合材料的值。SnO2@CNT核壳复合材料优异的储锂性能和倍率容量性能使其成为锂离子电池极有前途的负极材料。
Carbon nanotube-encapsulated SnO2(SnO2@CNT) core–shell composite anode materials are prepared by chemical activation of carbon nanotubes (CNTs) and wet chemical filling. The results of X-ray diffraction and transmission electron microscopy measurements indicate that SnO2is filled into the interior hollow core of CNTs and exists as small nanoparticles with diameter of about 6nm. The SnO2@CNT composites exhibit enhanced electrochemical performance at various current densities when used as the anode material for lithium-ion batteries. At 0.2mAcm−2(0.1C), the sample containing wt. 65% of SnO2displays a reversible specific capacity of 829.5mAhg−1and maintains 627.8mAhg−1after 50 cycles. When the current density is 1.0, 2.0, and 4.0mAcm−2(about 0.5, 1.0, and 2.0C), the composite electrode still exhibits capacity retention of 563, 507 and 380mAhg−1, respectively. The capacity retention of our SnO2@CNT composites is much higher than previously reported values for a SnO2/CNT composite with the same filling yield. The excellent lithium storage and rate capacity performance of SnO2@CNT core–shell composites make it a promising anode material for lithium-ion batteries.