Hierarchical Li4Ti5O12/TiO2 composite tubes with regular structural imperfection for lithium ion storage.
Hierarchical Li4Ti5O12/TiO2 composite tubes with regular structural imperfection for lithium ion storage.
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具有规则结构缺陷的分层 Li4Ti5O12/TiO2 复合管，用于锂离子存储。
DOI：
10.1038/srep03490
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发表时间：
2013-12-12
影响因子：
4.6
通讯作者：
Chen, Jie-Sheng
中科院分区：
文献类型：
--
作者：
Jiang, Yan-Mei;Wang, Kai-Xue;Zhang, Hao-Jie;Wang, Jing-Feng;Chen, Jie-Sheng
通过煅烧多孔无定形TiO 2前驱体和一水合氢氧化锂的水热产物，成功地制备了由纳米片组成的分级Li 4 Ti 5 O 12/TiO 2管。分级管的特征在于粉末X射线衍射，氮气吸附/脱附，扫描电子显微镜和透射电子显微镜技术。这些纳米片表现出相当复杂的亚微观结构，具有规则的结构缺陷，包括大量的晶界和位错。通过恒电流充放电实验评价了其储锂性能。该产品在0.01、0.1和1.0 A g−1下的初始放电容量分别为420、225和160 mAh g − 1。 100次循环后，在1.0 A g−1下的放电容量为139 mAh g− 1，容量保持率为87%，显示出良好的高倍率性能和良好的循环性能。 高的电化学性能归因于管的独特结构和形态。纳米片中存在的规则的结构缺陷也有利于这些管的锂离子存储性能。Li 4 Ti 5 O 12/TiO 2多级管是一种很有前途的高功率、高能量密度锂离子电池负极材料。
Hierarchical Li4Ti5O12/TiO2 tubes composed of ultrathin nanoflakes have been successfully fabricated via the calcination of the hydrothermal product of a porous amorphous TiO2 precursor and lithium hydroxide monohydrate. The hierarchical tubes are characterized by powder X-ray diffraction, nitrogen adsorption/desorption, scanning electron microscopy and transmission electron microscopy techniques. These nanoflakes exhibit a quite complex submicroscopic structure with regular structural imperfection, including a huge number of grain boundaries and dislocations. The lithium ion storage property of these tubes is evaluated by galvanostatic discharge/charge experiment. The product shows initial discharge capacities of 420, 225, and 160 mAh g−1 at 0.01, 0.1, and 1.0 A g−1, respectively. After 100 cycles, the discharge capacity is 139 mAh g−1 at 1.0 A g−1 with a capacity retention of 87%, demonstrating good high-rate performance and good cycleability. The high electrochemical performance is attributed to unique structure and morphology of the tubes. The regular structural imperfection existed in the nanoflakes also benefit to lithium ion storage property of these tubes. The hierarchical Li4Ti5O12/TiO2 tubes are a promising anode material for lithium-ion batteries with high power and energy densities.
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影响因子：
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通讯作者：
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