Graphene Nanoribbons Derived from the Unzipping of Carbon Nanotubes: Controlled Synthesis and Superior Lithium Storage Performance
Graphene Nanoribbons Derived from the Unzipping of Carbon Nanotubes: Controlled Synthesis and Superior Lithium Storage Performance
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DOI：
10.1021/jp410812v
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发表时间：
2014-01
影响因子：
3.7
通讯作者：
B. Xiao;Xifei Li;Xia Li;Biqiong Wang;Craig Langford;Ruying Li;X. Sun
中科院分区：
文献类型：
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作者：
B. Xiao;Xifei Li;Xia Li;Biqiong Wang;Craig Langford;Ruying Li;X. Sun
化学解压缩碳纳米管（cnt）制备的石墨烯纳米带（gnr）是锂离子电池材料的理想候选材料，但很少有研究关注不同解压缩水平下石墨烯纳米带的控制。本文研究了可控解压缩水平的gnr，以及影响解压缩初期和最终锂存储性能的主要因素；此外，还对热还原的影响进行了研究。在Raman和BET表面积测试的基础上，我们发现CNTs的解压缩从表面蚀刻开始，然后是部分解压缩和完全解压缩，最后是破碎和聚集。恒流充放电表明，缺陷的增加是解压缩初期容量增大的主要原因；表面积下降与最终解压缩级别的容量衰减有关。表面官能团可以导致低导电性，从而导致容量下降在7…
Graphene nanoribbons (GNRs) from chemical unzipping of carbon nanotubes (CNTs) have been reported to be a suitable candidate for lithium ion battery materials, but very few of them focused on controlling GNRs with different unzipping levels. Here we present a study of GNRs with controlled unzipping level and the prevailing factors that affect the lithium storage performance at early and final unzipping level; besides, the effect of thermal reduction has been investigated. On the basis of Raman and BET surface area tests, we found that the unzipping of CNTs starts with surface etching and then proceeds to partial and full unzipping and finally fragmentation and aggregation. Galvanostatic charge–discharge reveals that defect increase is mainly responsible for the capacity enhancement at the early unzipping level; surface area drop is associated with the capacity fade at the final unzipping level. Surface functional groups can result in low electrical conductivity and therefore cause capacity drop within sev...