Self-assembled 3-D flower-shaped SnO2 nanostructures with improved electrochemical performance for lithium storage
Self-assembled 3-D flower-shaped SnO2 nanostructures with improved electrochemical performance for lithium storage
复制标题
DOI：
10.1016/j.actamat.2009.10.001
复制
发表时间：
2010-02
期刊：
影响因子：
9.4
通讯作者：
Rong Yang;Ying Gu;Yaoqi Li;Jie Zheng;Xingguo Li
中科院分区：
文献类型：
--
作者：
Rong Yang;Ying Gu;Yaoqi Li;Jie Zheng;Xingguo Li
以二水氯化锡（SnCl2·2H2O）和柠檬酸钠（Na3C6H5O7·2H2O）为原料，在碱溶液中进行简单水热处理，成功地合成了花状sno2纳米板。所得的sno2纳米片厚度小于5nm，可自组装成花状纳米结构。柠檬酸盐的加入是制备sno2纳米板的关键。sno2纳米粒子的纳米形状和自组装结构主要受溶液碱度的控制。将自组装sno2纳米结构用作锂离子电池的负极材料时，循环30次后，其可逆容量为670mAhg−1，第二次循环后，每循环平均容量衰减0.95%。水热合成法制备的sno2样品具有良好的电化学性能，表明了制备锂离子电池专用自组装三维纳米结构的可能性。
Flower-shaped SnO2nanoplates were successfully synthesized via a simple hydrothermal treatment of a mixture of tin(II) dichloride dihydrate (SnCl2·2H2O) and sodium citrate (Na3C6H5O7·2H2O) in alkali solution. The obtained SnO2nanoplates were less than 5nm thick and self-assembled into flower-shaped nanostructures. The introduction of citrate was essential for the preparation of the SnO2nanoplates. The nanoscale shape and self-assembled architecture of SnO2nanoparticles were mainly controlled by the alkalinity of the solution. When the self-assembled SnO2nanostructures were used as anode materials in Li-ion batteries, they exhibit a reversible capacity of 670mAhg−1after 30cycles and an average capacity fading of 0.95% per cycle after the second cycle. The good electrochemical performance of the SnO2sample prepared via the hydrothermal synthesis indicates the possibility of fabricating specific self-assembled three-dimensional nanostructures for Li-ion batteries.