Wang Ziqi, Liang Jiaojiao, Fan Kai, Liu Xiaodi, Wang Caiyun, Ma Jianmin
School of Physics and Electronics, Hunan University, Changsha, China.
College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang, China.
Front Chem. 2018 Sep 19;6:396. doi: 10.3389/fchem.2018.00396. eCollection 2018.
NaTi(PO) has attracted great interest as anode material for sodium ion batteries owing to its open three-dimensional framework structure and limited volume changes during the charge and discharge process. However, the poor intrinsic electronic conductivity of NaTi(PO) needs to be improved for high rate capability. In this work, porous NaTi(PO) nanocubes anchored on porous carbon nanosheets (NaTi(PO)/C) are designed and developed. This material exhibits a large discharge capacity and good rate capacity including a first discharge capacity of 485 mAh g at a current density of 0.1 A g, and 98 mAh g retained at a high rate of 4 A g even after 2,000 cycles. These results suggest that NaTi(PO)/C is a promising anode material for sodium-ion batteries.
由于其开放的三维骨架结构以及在充放电过程中有限的体积变化，NaTi(PO)作为钠离子电池的负极材料引起了极大的关注。然而，为了实现高倍率性能，NaTi(PO)较差的本征电子导电性需要得到改善。在这项工作中，设计并制备了锚定在多孔碳纳米片上的多孔NaTi(PO)纳米立方体（NaTi(PO)/C）。这种材料展现出较大的放电容量和良好的倍率性能，包括在0.1 A g的电流密度下首次放电容量为485 mAh g，即使在2000次循环后，在4 A g的高倍率下仍保留98 mAh g。这些结果表明NaTi(PO)/C是一种很有前景的钠离子电池负极材料。
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