一步水热法,然后在氩气气氛中在300°C下煅烧,已开发用于合成TiO2-B纳米粒子/双壁纳米管(NP/DWNT)和TiO2-B纳米粒子/多壁纳米管(NP/MWNT)。据我们所知,这是TiO2-BNP/NT分层结构的首次合成。NP/DWNT和NP/MWNT作为锂离子电池负极材料均表现出高性能,优于DWNT和MWNT的同行,分别。在本文研究的所有四种材料中,NP/DWNT具有最高的放电-充电容量,速率能力,和循环稳定性。由于NP负载的增强来自增加的表面积,改进的动力学,以及电子和锂离子的传输距离减小。高速率下的电荷容量在于源自TiO2-B中通过无限通道的快速锂离子传输的嵌入假电容。DWNT材料相对于MWNT材料的优越性归因于较薄的壁,这提供了通过径向方向的锂离子传输的较短距离。
A one-step hydrothermal method, followed by calcination at 300 °C in an argon atmosphere, has been developed to synthesize TiO2-B nanoparticles/double-walled nanotubes (NP/DWNT) and TiO2-B nanoparticles/multiple-walled nanotubes (NP/MWNT). To the best of our knowledge, this is the first synthesis of TiO2-B NP/NT hierarchical structures. Both NP/DWNT and NP/MWNT show high performance as anode materials for lithium-ion batteries, superior to their counterparts of DWNT and MWNT, respectively. Among all the four materials studied herein, NP/DWNT demonstrates the highest discharge-charge capacity, rate capability, and cycling stability. The enhancement due to the NP loading results from the increased surface areas, the improved kinetics, and the decreased transport distance for both electrons and Li ions. The charge capacity at high rates lies in the intercalation pseudocapacitance originating from fast Li-ion transport through the infinite channels in TiO2-B. The superiority of DWNT materials versus MWNT materials is ascribed to the thinner walls, which provide a shorter distance for Li-ion transport through the radial direction.