Facile synthesis of mesoporous Mn3O4 nanotubes and their excellent performance for lithium-ion batteries
Facile synthesis of mesoporous Mn3O4 nanotubes and their excellent performance for lithium-ion batteries
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介孔Mn3O4纳米管的简便合成及其在锂离子电池中的优异性能
DOI：
10.1039/c3ta11910f
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Xiong, Shenglin
中科院分区：
文献类型：
--
作者：
Bai, Zhongchao;Fan, Na;Xiong, Shenglin
由于低成本和操作潜力，Mn 3 O 4作为锂离子电池的阳极材料在过渡金属氧化物中是非常引人注目的。在此，通过氢气还原β-MnO 2纳米管，在H2/Ar气氛下，于280 ℃反应3 h，首次合成了比表面积为42.18 m（2）g（-1），平均孔径为3.72 nm的介孔Mn 3 O 4纳米管。电化学测试结果表明，介孔Mn 3 O 4纳米管在500 mA g（-1）的高电流密度下循环100次后的可逆容量为641 mA h g（-1）（远高于石墨的理论容量372 mA h g（-1））。这种上级的电化学性能可以归因于独特的一维介孔纳米管结构，其为电解质离子提供了快速和灵活的传输路径，并且还提供了足够的自由空间以缓冲基于在重复的锂离子插入/提取期间的转化反应的阳极的大体积变化。电化学性能的改善使得这种介孔Mn 3 O 4管状结构有望作为下一代锂离子电池的阳极材料。
Because of the low cost and operating potential, Mn3O4 is highly noticeable among transition metal oxides as an anode material for Li-ion batteries. Here, mesoporous Mn3O4 nanotubes with a high surface area of 42.18 m(2) g(-1) and an average pore size of 3.72 nm were synthesized for the first time through the hydrogen reduction of beta-MnO2 nanotubes under a H-2/Ar atmosphere at 280 degrees C for 3 h. Electrochemical results demonstrate that the reversible capacity of mesoporous Mn3O4 nanotubes is 641 mA h g(-1) (much higher than the theoretical capacity of graphite, similar to 372 mA h g(-1)) after 100 cycles at a high current density of 500 mA g(-1). The superior electrochemical performance can be attributed to the unique 1D mesoporous nano-tubular structure, which offers fast and flexible transport pathways for electrolyte ions, and also provides sufficient free space to buffer the large volume change of anodes based on the conversion reaction during the repeated lithium-ion insertion/extraction. The improved electrochemical performance makes such a mesoporous Mn3O4 tubular structure promising as an anode material for next-generation lithium-ion batteries.