High Performance Tin-coated Vertically Aligned Carbon Nanofiber Array Anode for Lithium-ion Batteries
High Performance Tin-coated Vertically Aligned Carbon Nanofiber Array Anode for Lithium-ion Batteries
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DOI：
10.1557/adv.2018.520
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发表时间：
2018-07
期刊：
影响因子：
0.8
通讯作者：
G. P. Pandey;K. Jones;Emery Brown;Jun Li;L. Meda
中科院分区：
文献类型：
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作者：
G. P. Pandey;K. Jones;Emery Brown;Jun Li;L. Meda
本研究报道了一种用于锂离子电池的高性能锡（Sn）涂层垂直排列碳纳米纤维阵列阳极。采用同轴溅射法在垂直排列的纳米碳纤维（VACNF）芯上涂覆锡壳，制备了阵列电极。坚固的电刷状高导电性VACNFs有效地连接高容量锡壳，用于锂离子存储。在C/20倍率下获得了815 mAh g^-1的高比容量，达到了Sn的最大值。然而，该电极在传统的LiPF_6基有机电解质中循环性能较差。氟碳酸乙烯（FEC）的加入显著提高了性能，sn包覆的VACNFs阳极具有稳定的循环性能。在含10 wt.% FEC电解质的半电池测试中，sn包覆的VACNF阵列阳极表现出出色的容量保持能力，并且在C/3速率下循环50次后可以提供480 mAh g^-1的可逆容量。
This study reports a high-performance tin (Sn)-coated vertically aligned carbon nanofiber array anode for lithium-ion batteries. The array electrodes have been prepared by coaxial sputter-coating of tin (Sn) shells on vertically aligned carbon nanofiber (VACNF) cores. The robust brush-like highly conductive VACNFs effectively connect high-capacity Sn shells for lithium-ion storage. A high specific capacity of 815 mAh g^-1 of Sn was obtained at C/20 rate, reaching toward the maximum value of Sn. However, the electrode shows poor cycling performance with conventional LiPF_6 based organic electrolyte. The addition of fluoroethylene carbonate (FEC) improve the performance significantly and the Sn-coated VACNFs anode shows stable cycling performance. The Sn-coated VACNF array anodes exhibit outstanding capacity retention in the half-cell tests with electrolyte containing 10 wt.% FEC and could deliver a reversible capacity of 480 mAh g^-1 after 50 cycles at C/3 rate.