TiO2 quantum dots embedded in bamboo-like porous carbon nanotubes as ultra high power and long life anodes for lithium ion batteries
TiO2 quantum dots embedded in bamboo-like porous carbon nanotubes as ultra high power and long life anodes for lithium ion batteries
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嵌入竹状多孔碳纳米管中的TiO2量子点作为锂离子电池的超高功率和长寿命阳极
DOI：
10.1016/j.jpowsour.2016.04.033
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发表时间：
2016-07-01
影响因子：
9.2
通讯作者：
Qiu, Jieshan
中科院分区：
文献类型：
--
作者：
Tang, Yakun;Liu, Lang;Qiu, Jieshan
通过磺化聚合物纳米管与二氧化钛杂化产物的热解，构建了嵌入竹节状多孔碳纳米管中的二氧化钛量子点。由于高度交联的共聚网络中的空间限制，在热解过程中形成了二氧化钛量子点。聚合物纳米管的磺化程度是保证形成独特的互穿结构的关键因素。该纳米复合材料在100 mAg(-1)下表现出523mAg(-1)的可逆容量，200次循环后表现出优异的倍率性能和良好的长期循环稳定性，在2000 mAg(-1)下可达到189mAhg(-1)的放电容量，最高可达2000次循环。纳米复合材料的电化学性能的提高得益于二氧化钛量子点的均匀分布、多孔碳的高电子传导性和独特的互穿结构，同时解决了二氧化钛阳极面临的粉化、电接触损失和颗粒聚集的主要问题。(C)2016爱思唯尔B.V.保留所有权利。
TiO2 quantum dots embedded in bamboo-like porous carbon nanotubes have been constructed through the pyrolysis of sulfonated polymer nanotubes and TiO2 hybrids. The TiO2 quantum dots are formed during the pyrolysis, due to the space confinement within the highly cross-linked copolymer networks. The sulfonation degree of the polymer nanotubes is a critical factor to ensure the formation of the unique interpenetrating structure. The nanocomposites exhibit high reversible capacity of 523 mAh g(-1) at 100 mA g(-1), after 200 cycles, excellent rate capability and superior long-term cycling stability at high current density, which could attain a high discharge capacity of 189 mAh g(-1), at 2000 mA g(-1) for up to 2000 cycles. The enhanced electrochemical performance of the nanocomposites benefit from the uniform distribution of TiO2 quantum dots, high electronic conductivity of porous carbons and unique interpenetrating structure, which simultaneously solved the major problems of TiO2 anode facing the pulverization, loss of electrical contact and particle aggregation. (C) 2016 Elsevier B.V. All rights reserved.