MoS2/cotton-derived carbon fibers with enhanced cyclic performance for sodium-ion batteries
MoS2/cotton-derived carbon fibers with enhanced cyclic performance for sodium-ion batteries
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用于钠离子电池的具有增强循环性能的MoS2/棉源碳纤维
DOI：
10.1016/j.apsusc.2017.03.259
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发表时间：
2017
影响因子：
6.7
通讯作者：
Zhu Min
中科院分区：
文献类型：
--
作者：
Li Xiang;Yang Yan;Liu Jiangwen;Ouyang Liuzhang;Liu Jun;Hu Renzong;Yang Lichun;Zhu Min
生物模板法制备的碳纤维具有成本低、环境友好等优点，在储能材料方面受到广泛关注。本文采用水热法和碳化法成功制备了MoS 2/棉基碳纤维（MoS 2/CDCF）。在MoS 2/CDCF复合材料中，MoS 2纳米片在碳纤维上垂直生长，为电子传递提供了快速的途径，同时作为稳定的载体缓冲了MoS 2纳米片在充放电循环中的体积变化。作为钠离子电池负极材料，MoS 2/CDCF具有良好的倍率性能和显著提高的循环稳定性。在0.1 A g-1的电流密度下，MoS 2/CDCFs-1显示出504.9 mAh g-1的初始可逆容量，并且在50次循环后保持444.5 mAh g-1。即使当电流密度增加到0.5 A g-1时，它在150次循环后仍保持323.1 mAh g-1，这远高于裸MoS 2纳米片的149.6 mAh g-1的容量保持率。电化学性能的提高验证了以棉花为碳源构建钠离子电池分级复合材料的有效策略。
Carbon fibers derived from bio-template are low cost and environmental benign, therefore have attracted much attention in energy storage materials. In this work, we successfully fabricated MoS2/cotton-derived carbon fibers (MoS2/CDCFs) via hydrothermal route followed by carbonization process. In the composite of MoS2/CDCFs, MoS2nanosheets vertically grow on the carbon fibers which offer fast ways for electron transfer and at the same time act as robust support to buffer the volume changes of MoS2nanosheets during discharge/charge cycles. As anode materials for sodium-ion batteries, MoS2/CDCFs exhibit good rate performance and markedly enhanced cyclic stability due to the conductive support of CDCFs. At a current density of 0.1 A g−1, the MoS2/CDCFs-1 shows an initial reversible capacity of 504.9 mAh g−1, and maintains 444.5 mAh g−1after 50 cycles. Even when the current density increases to 0.5 A g−1, it maintains 323.1 mAh g−1after 150 cycles, which is much higher than the capacity retention of 149.6 mAh g−1for the bare MoS2nanosheets. The improved electrochemical performance verifies the effective strategy of using cotton as carbon source to construct hierarchical composites for sodium-ion batteries.