A tightly integrated sodium titanate-carbon composite as an anode material for rechargeable sodium ion batteries
A tightly integrated sodium titanate-carbon composite as an anode material for rechargeable sodium ion batteries
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紧密集成的钛酸钠-碳复合材料作为可充电钠离子电池的负极材料
DOI：
10.1016/j.jpowsour.2014.10.045
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发表时间：
2015-01
影响因子：
9.2
通讯作者：
xianyou Wang
中科院分区：
文献类型：
--
作者：
Jinli Tan;Qian Zhou;Zhifeng Huang;xianyou Wang
采用流变相法合成了一种新型的钛酸钠-碳（Na 2 Ti 3 O 7/C）复合材料。通过X射线衍射、扫描电子显微镜（SEM）和高分辨率透射显微镜（HRTEM）表征，碳的分散不仅包裹了单一的Na 2 Ti 3 O 7颗粒，而且将所有的Na 2 Ti 3 O 7颗粒结合成一个稳定的整体。均匀分布的碳在Na 2 Ti 3 O 7颗粒之间形成了良好的导电路径网络，这些导电路径彼此紧密相连。因此，Na 2 Ti 3 O 7活性材料可以从各个方向获得电子，并充分利用电子进行钠离子的插入和引出反应，从而改善钠的储存性能，提高倍率性能和超循环性能。Na 2 Ti 3 O 7/C复合材料的电化学性能比裸Na 2 Ti 3 O 7好得多，在1C下100次循环后的放电容量为111.8 mAh g− 1，而裸Na 2 Ti 3 O 7在相同条件下的放电容量仅为48.6 mAh g− 1。此外，即使在5C下，该复合材料在长期循环期间也显示出相对稳定的存储容量。Na 2 Ti 3 O 7的循环性能和倍率性能的显著改善归因于碳和Na 2 Ti 3 O 7之间的紧密结合，这可以提高电子导电性，降低电荷转移电阻，改善循环过程中的电化学稳定性，从而使其成为一种先进的钠离子电池负极材料。
A novel sodium titanate-carbon (Na2Ti3O7/C) composite has been successfully synthesized via a rheological phase method. The homogeneous-dispersed carbon not only sheathes the single Na2Ti3O7particle but also combines all individual Na2Ti3O7particles to a stable union, as characterized by X-ray diffraction, scanning electron microscopy (SEM), and high-resolution transmission microscopy (HRTEM). The uniformly distributed carbon forms a good network of electrically conductive paths among the Na2Ti3O7particles, which is closely interlinked with each other. So Na2Ti3O7active material can get electrons from all directions and be fully utilized for sodium ion insertion and extraction reactions, which can improve sodium storage properties with enhanced rate capability and super cycling performance. The Na2Ti3O7/C composite exhibits much better electrochemical performance than bare Na2Ti3O7, which displays a stable discharge capacity of 111.8 mAh g−1at 1C after 100 cycles, while only 48.6 mAh g−1for bare Na2Ti3O7at the same conditions. Furthermore, the composite shows relatively stable storage capacities during long term cycling even at 5C. The remarkably improved cycling performance and rate capability of Na2Ti3O7are attributed to the tight integration between carbon and Na2Ti3O7which may enhance the electronic conductivity, decrease the charge transfer resistance and improve the electrochemical stability during cycling, thus making a compelling case for its development as an advanced anode material for sodium ion batteries.
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影响因子：
11.9
作者：
Rudola, Ashish;Saravanan, Kuppan;Balaya, Palani
通讯作者：
Balaya, Palani
影响因子：
29.4
作者：
Li, Shuo;Dong, Yifan;Mai, Liqiang
通讯作者：
Mai, Liqiang
影响因子：
19
作者：
Komaba, Shinichi;Murata, Wataru;Fujiwara, Kazuya
通讯作者：
Fujiwara, Kazuya
影响因子：
8.6
作者：
Alcántara, R;Jaraba, M;Tirado, JL
通讯作者：
Tirado, JL
DOI：
10.1002/chin.200413021
发表时间：
2004-03
期刊：
ChemInform
影响因子：
--
作者：
S. Eiden-Assmann;J. Widoniak;G. Maret
通讯作者：
S. Eiden-Assmann;J. Widoniak;G. Maret