钛酸钠纳米管-碳复合材料用作钠离子电容电池负极材料

doi:10.11944/j.issn.1000-0518.2018.10.170454

摘要/Abstract

摘要：

以二氧化钛、氢氧化钠溶液和葡萄糖作为初始原料,通过水热方法合成了钛酸钠纳米管-碳复合材料。使用XRD和TEM等方法测试了材料的结晶情况和形貌, 通过氮气吸-脱附和热重实验测试了材料的孔结构和碳含量。采用复合材料作为负极材料,和石墨正极材料配伍,组装成不对称型电容电池,在钠基有机系电解液中其电压可高达3.5 V。探讨了负极材料的储能机理,并考察了正负极质量比对负极储钠容量的影响。电化学性能测试结果显示,电容电池具有较高能量密度和功率密度,其数值分别为72 Wh/Kg和1256 W/Kg,电容电池也表现出了较好的循环稳定性,在0.17 A/g电流密度下,经1000次循环后容量保持率高达100%。

关键词: 钛酸钠纳米管, 石墨, 钠离子, 电容电池, 负极材料

Abstract:

Sodium titanate nanotube-carbon(STN-C) composites were prepared by a hydrothermal method using TiO₂, NaOH solution and glucose as starting materials. X-ray diffraction(XRD) and transmission electron microscopy(TEM) were employed to characterize its crystal morphology. N₂ adsorption-desorption and thermogravimetry(TG) methods were applied to confirm its pore structure and mass ratio of carbon. STN-C was adopted as negative electrode materials for the asymmetric electrochemical supercapatteries of STN-C/graphite using Na⁺-based organic electrolytes. This type of supercapatteries possess the working voltage as high as 3.5 V. The charge storage mechanism at the negative electrode was studied and the effect of mass ratio of graphite/STN-C was investigated. The electrochemical performance tests reveal that the supercapatteries have relatively high energy density and power density, i.e., 72 Wh/Kg and 1256 W/Kg, respectively. The supercapatteries also show high cycle stability, displaying a 100% capacity retention after 1000 cycles at a current density of 0.17 A/g.

Key words: sodium titanate nanotube, graphite, sodium-ion, electrochemical supercapattery, negative electrode materials

赵立平, 陶科宇, 王宏宇, 齐力. 钛酸钠纳米管-碳复合材料用作钠离子电容电池负极材料[J]. 应用化学, 2018, 35(10): 1264-1270.

ZHAO Liping, TAO Keyu, WANG Hongyu, QI Li. Sodium Titanate Nanotube-Carbon Composite as Negative Electrode Materials for Na-Ion Supercapattery[J]. Chinese Journal of Applied Chemistry, 2018, 35(10): 1264-1270.

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