Nanoflaky MnO2/carbon nanotube nanocomposites as anode materials for lithium-ion batteries
Nanoflaky MnO2/carbon nanotube nanocomposites as anode materials for lithium-ion batteries
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DOI：
10.1039/c0jm00759e
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发表时间：
2010-08
影响因子：
--
通讯作者：
H. Xia;M. Lai;Li Lu
中科院分区：
文献类型：
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作者：
H. Xia;M. Lai;Li Lu
采用简单的溶液法合成了毛毛虫状纳米片状MnO 2/碳纳米管（CNT）纳米复合材料。为了构建一个三维层次结构，高度多孔互连的二氧化锰纳米片均匀地涂覆在碳纳米管的表面上。作为一种有前途的锂离子电池负极材料，纳米片状MnO 2/CNT纳米复合材料电极在第一次循环中表现出801 mA h g-1的大可逆容量（约1000 mA h g-1可归因于单独的MnO 2多孔层），在前20次循环中没有容量衰减，并具有良好的倍率性能。与纯MnO 2电极相比，MnO 2/CNT纳米复合材料电极的上级电化学性能可以归因于其独特的层次结构，其能够提供快速的锂离子和电子传输，并适应转化反应期间的大体积变化。
Caterpillar-like nanoflaky MnO2/carbon nanotube (CNT) nanocomposites are synthesized via a facile solution method. To build a three-dimensional hierarchy architecture, highly porous interconnected MnO2 nanoflakes are uniformly coated on the surface of the CNTs. As a promising anode material for lithium-ion batteries, the nanoflaky MnO2/CNT nanocomposite electrode exhibits a large reversible capacity of 801 mA h g−1 (∼1000 mA h g−1 can be attributed to the MnO2 porous layer alone) for the first cycle without capacity fade for the first 20 cycles and with a good rate capability. The superior electrochemical performance of the MnO2/CNT nanocomposite electrode compared to the pure MnO2 electrode can be attributed to its unique hierarchy architecture, which is able to provide fast lithium ion and electron transport and to accommodate a large volume change during the conversion reactions.