Facile and fast synthesis of porous TiO2 spheres for use in lithium ion batteries.
Facile and fast synthesis of porous TiO2 spheres for use in lithium ion batteries.
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DOI：
10.1016/j.jcis.2013.11.035
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发表时间：
2014-03
影响因子：
9.9
通讯作者：
Hong-en Wang;Jun Jin;Yi Cai;Junming Xu;Dai-Song Chen;Xianfeng Zheng;Zhao Deng;Yu Li;I. Bello
中科院分区：
文献类型：
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作者：
Hong-en Wang;Jun Jin;Yi Cai;Junming Xu;Dai-Song Chen;Xianfeng Zheng;Zhao Deng;Yu Li;I. Bello
采用微波辅助水热法合成了多孔纳米TiO 2微球。所合成的TiO 2球由平均尺寸为8.7 nm的相互连接的纳米晶体形成，粒径为250-400 nm。在500 °C下退火后，TiO 2样品保持球形，并发展出比表面积为151 m2 g −1的高度介孔特性。在750 °C下退火的TiO 2样品由直径为500-900 nm的较大聚集颗粒组成，仍然保留中孔结构，但比表面积减少到25.6 m2 g −1。电化学研究表明，在500 °C下退火的多孔TiO 2球具有非常高和稳定的锂离子（Li+）存储容量，分别为207，184，166和119 mA h g− 1，在0.5，1，2和5 C（850 mA g−1）率，由于其高度多孔的纳米结构和精细的球形形态。相比之下，在700 °C下退火的TiO 2球由于其减少的孔结构和较大的微晶尺寸而表现出适度的电化学性能。所制备的多孔TiO 2球形粒子作为高性能锂离子电池负极材料具有很好的应用前景。
Porous anatase TiO2spheres have been synthesized by a microwave-assisted hydrothermal reaction of spherical particle precursors followed by annealing in air. The synthesized TiO2spheres are formed by interconnected nanocrystals with size of 8.7 nm in average and have grain diameters of 250–400 nm. After annealing at 500 °C, the TiO2samples maintain spherical shape and develop highly mesoporous characteristics with a specific surface area of 151 m2g−1. The TiO2samples annealed at 750 °C consist of larger aggregated particles with diameters of 500–900 nm and still retain mesoporous anatase structure, but with a reduced specific surface area of 25.6 m2g−1. Electrochemical studies reveal that the porous TiO2spheres annealed at 500 °C own very high and stable lithium ion (Li+) storage capacities of 207, 184, 166, and 119 mA h g−1at 0.5, 1, 2, and 5 C (850 mA g−1) rates, respectively, owing to their highly porous nanostructures and fine spherical morphology. In contrast, the TiO2spheres annealed at 700 °C exhibit modest electrochemical performance due to their reduced pore structures and larger crystallite size. The prepared porous TiO2spherical particles show great promise for use as high performance anode materials for lithium ion batteries (LIBs).