In Situ Fabrication of Branched TiO2/C Nanofibers as Binder-Free and Free-Standing Anodes for High-Performance Sodium-Ion Batteries
In Situ Fabrication of Branched TiO2/C Nanofibers as Binder-Free and Free-Standing Anodes for High-Performance Sodium-Ion Batteries
复制标题
原位制备支化 TiO2/C 纳米纤维作为高性能钠离子电池的无粘合剂和独立式阳极
DOI：
10.1002/smll.201901584
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发表时间：
2019
期刊：
影响因子：
13.3
通讯作者：
Seeram Ramakrishna
中科院分区：
文献类型：
--
作者：
Ling Wang;Guorui Yang;Jianan Wang;Silan Wang;Caiyun Wang;Shengjie Peng;Wei Yan;Seeram Ramakrishna
本文报道了基于原位制造方法的一维独立且无粘合剂的分级支化 TiO2/C 纳米纤维（表示为 BT/C NF）作为钠离子电池的阳极。原位制造赋予该材料较大的表面积和较强的结构稳定性，为该材料提供了丰富的活性位点和光滑的离子快速传输通道。因此，具有独立膜特性的BT/C NF直接用作钠离子电池的无粘合剂负极，在200 mA g−1的电流密度下，经过1000次循环后，容量达到284 mA h g−1。即使在2000 mA g−1的高电流密度下，可逆容量仍然可以达到204 mA h g−1。通过动力学分析，表明显着的表面赝电容行为也是实现优异性能的主要因素。合理设计的结构加上固有的赝电容行为赋予了这种材料用于钠离子电池的潜力。
Herein, 1D free-standing and binder-free hierarchically branched TiO2/C nanofibers (denoted as BT/C NFs) based on an in situ fabrication method as an anode for sodium-ion batteries are reported. The in situ fabrication endows this material with large surface area and strong structural stability, providing this material with abundant active sites and smooth channels for fast ion transportation. As a result, BT/C NFs with the character of freestanding membranes are directly used as binder-free anode for sodium-ion batteries, delivering a capacity of 284 mA h g−1 at a current density of 200 mA g−1 after 1000 cycles. Even at a high current density of 2000 mA g−1, the reversible capacity can still achieve as high as 204 mA h g−1. By means of kinetic analysis, it is demonstrated that the remarkable surface pseudocapacitive behavior is also a major factor to achieve excellent performance. The rationally designed structure coupled with the inherent pseudocapacitive behavior gives this material potential for sodium-ion batteries.