TiO2 seeded on nitrogen-doped porous carbon nanofibers for superior electrochemical performance as freestanding anodes of lithium-ion batteries
TiO2 seeded on nitrogen-doped porous carbon nanofibers for superior electrochemical performance as freestanding anodes of lithium-ion batteries
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TiO2 接种在氮掺杂多孔碳纳米纤维上，作为锂离子电池的独立阳极具有优异的电化学性能
DOI：
10.1088/1361-6528/aae12c
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发表时间：
2018-10
期刊：
影响因子：
3.5
通讯作者：
Fu Hongjun
中科院分区：
文献类型：
--
作者：
Wang Wei;Liang Yaohui;Li Fengyan;Li Nan;Xu Zhiwei;Wang Haibo;Jing Miaolei;Teng Kunyue;Niu Jiarong;Fu Hongjun
将掺氮的多孔碳纳米纤维与TiO 2晶种堆叠成纤维垫，并直接冲压成圆形作为锂离子电池阳极。种子结构是由半包裹的二氧化钛纳米粒子的碳纳米纤维（CNFs）涂有一层薄薄的碳。同时，在CNF上形成具有不同宽度的孔。作为独立式阳极，达到615 mAh g-1的初始放电容量，库仑效率为56%，并且在100 mA g-1的电流密度下100次循环后获得322 mAh g-1。这归因于来自具有各种宽度的孔的锂离子的活性位点的数量增加以及源自氮掺杂的改善的导电性。与其他对应物相比，在各种电流密度下优异的上级倍率性能（在2000 mA g-1的电流密度下为179 mAh g-1）归因于借助于C-O-Ti键的源自晶种结构的结构稳定性。在2000 mA g-1的电流密度下显示出额外的800次循环，并且还显示出优异的上级稳定性。
Fibrous mats piled by nitrogen-doped porous carbon nanofibers with seeded TiO2 are fabricated and punched directly into circles as lithium-ion battery anodes. The seeding structure is composed of semi-wrapped TiO2 nanoparticles on carbon nanofibers (CNFs) coated with a thin layer of carbon. Synchronously, pores with various widths are formed on CNFs. As a freestanding anode, an initial discharge capacity of 615 mAh g−1 with a coulombic efficiency of 56% is reached, and 322 mAh g−1 is obtained after 100 cycles at a current density of 100 mA g−1. This is assigned to the increasing number of active sites for the lithium ion from pores with various widths and improved conductivity originating from nitrogen doping. Superior rate performance (179 mAh g−1 at the current density of 2000 mA g−1) under various current densities compared with that of other counterparts is attributed to the structural stability originating from the seeding structure with the help of the C–O–Ti bond. An additional 800 cycles are displayed at the current density of 2000 mA g−1, and superior stability is also exhibited.
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