低温引入碳对锂离子电池材料SnO_2阳极行为的影响(英文)

Effect of the Carbon Introduced at Low Temperature on the Anodic Behavior of SnO_2 for Lithium Ion Battery

以SnO2和葡萄糖为原料,采用一种简单的低温水热法制备了SnO2/C复合材料。采用SEM,TEM,XRD,TG和电化学测试系统对SnO2/C复合材料进行研究,研究结果表明:样品由亚微米大小球形颗粒组成,碳含量大约1.5wt%。作为锂离子电池负极材料,SnO2/C复合材料展现了高达52.7%的起始库仑效率和753.4 mAh/g的可逆容量,而没有碳复合的SnO2材料仅显示了39.8%的起始库仑效率和548 mAh/g的可逆容量。SnO2/C复合材料也展现了良好的循环性能和稳定的高倍率性能。这表明水热法低温引入碳是SnO2/C复合材料具有良好电化学性能的重要影响因素。

The SnO2/C composite was prepared by a facile low temperature hydrothermal procedure using SnO2 and glucose as raw materials.The pepared SnO/C composite were characterized by SEM,TEM,XRD,TG and electrochemical test system.The results showed that the composite is made up of spherical particles with the diameter of submicron size.The carbon content in the composite is about 1.5 wt%.As the anode active material for Li-ion batteries,the composite show an initial coulombic efficiency up to 52.7% and an initial reversible capacity as high as 753.4 mAh/g,while the bare SnO2 anode only show an initial coulombic efficiency of 39.8% and an initial reversible capacity of 548 mAh/g.The composite also exhibit an improved cycle durability and a stable high rate property.The improved electrochemical performance of the composite could be ascribed to the effect of the introduced-carbon which obtain by a low temperature hydrothermal reaction.