Ti2Nb2O9/graphene hybrid anode with superior rate capability for high-energy-density sodium-ion capacitors
Ti2Nb2O9/graphene hybrid anode with superior rate capability for high-energy-density sodium-ion capacitors
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Ti2Nb2O9/石墨烯混合阳极具有优异的倍率性能，适用于高能量密度钠离子电容器
DOI：
10.1016/j.jallcom.2020.158431
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发表时间：
2021-04
影响因子：
6.2
通讯作者：
Liu Zong-Huai
中科院分区：
文献类型：
--
作者：
She Liaona;Zhang Feng;Jia Congying;Kang Liping;Li Qi;He Xuexia;Sun Jie;Lei Zhibin;Liu Zong-Huai
采用HTiNbO5纳米片与氧化石墨烯（GO）纳米片絮凝制备Ti2Nb2O9/还原氧化石墨烯（Ti2Nb2O9/RGO）杂化阳极，并将HTiNbO5/GO复合材料在500℃氩气中退火1 h，其中以ktinbo5为前驱体，采用离子交换法制备HTiNbO5纳米片，然后进行剥离处理。HTiNbO5纳米片在拓扑上转化为Ti2Nb2O9纳米片，并通过煅烧HTiNbO5/GO复合材料将GO还原为RGO，从而增强了Ti2Nb2O9/RGO杂化阳极的Na+插层赝电容行为，显著提高了Ti2Nb2O9/RGO杂化阳极的电导率。Ti2Nb2O9/RGO混合阳极具有优异的倍率能力（4 A g−1时206 mAh g−1）和出色的循环性能，在1 A g−1时超过1000次循环具有95%的容量保持率。以Ti2Nb2O9/RGO为阳极，活性炭（AC）为阴极组装了一种混合器件，在功率密度为75 W kg - 1时，其能量密度最高可达96 Wh kg - 1，当功率密度达到10029 W kg - 1时，其能量密度仍保持在39 Wh kg - 1。此外，组装的器件具有良好的循环稳定性，在10,000次循环后容量保持率为79%。该研究为钠离子电容器钛-铌氧化物-石墨烯复合阳极的制备提供了新的思路。
Ti2Nb2O9/reduced graphene oxide (Ti2Nb2O9/RGO) hybrid anode is fabricated by flocculation of HTiNbO5nanosheets and graphene oxide (GO) nanosheets, followed by annealing HTiNbO5/GO composite at 500 °C in Ar for 1 h, in which HTiNbO5nanosheets are prepared by ion-exchange and followed by exfoliating process using KTiNbO5as precursor. HTiNbO5nanosheets are topotactically transformed into Ti2Nb2O9nanosheets and GO is reduced into RGO by calcining the HTiNbO5/GO composite, causing enhanced Na+-intercalation pseudocapacitive behavior and significantly improved conductivity for Ti2Nb2O9/RGO hybrid anode. Ti2Nb2O9/RGO hybrid anode delivers superior rate capability (206 mAh g−1at 4 A g−1) and excellent cycling performance with 95% capacity retention at 1 A g−1over 1000 cycles. A hybrid device is assembled using Ti2Nb2O9/RGO as the anode and activated carbon (AC) as the cathode, it shows a maximum high energy density of 96 Wh kg−1at a power density of 75 W kg−1, and the energy density still maintains 39 Wh kg−1when the power density achieves as high as 10029 W kg−1. Moreover, the assembled device displays good cycling stability with a capacity retention of 79% after 10,000 cycles. This work can provide new insights on fabrication of Ti-Nb oxides-graphene based composite anode for sodium ion capacitors.
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