【作者】 徐甲强； 张海林； 潘庆谊； 向群； 李超；

【Author】 XU Jiaqiang~(1,2) ZHANG Hailin~2 PAN Qingyi~1 XIANG Qun~1 LI Chao~2 (1.Department of Chemistry,College of Science,Shanghai University,Shanghai 200444; 2.College of Materials and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou,450002,China)

【机构】 上海大学理学院化学系； 郑州轻工业学院材料和化学工程系；

【摘要】 采用水热法合成了新型锂离子电池阳极材料 Zn₂SnO₄纳米晶。研究了水热时间对材料结构、形貌及电化学性能的影响。通过 X 射线衍射、透射电镜和电化学法表征了产物的结构和形貌,并测试了材料的电化学特性。结果表明：水热时间将影响产物的形貌、尺寸和结晶度,从而影响其电化学性能。220℃水热处理28h 后,所获得的 Zn₂SnO₄具有较小的颗粒尺寸和较高的结晶度,其初始放电比容量,在100mA/g 恒电流密度和0～1．4V 电压范围内,达591．9（mA·h）/g；同样温度处理24h 后获得的 Zn₂SnO₄其初始放电容量为502．7mA·h/g,充放电14次后仍有409．5（mA·h）／g。220℃水热处理获得的 Zn₂SnO₄具有锂离子电池阳极材料应用所需的优异的电化学特性。更多还原

【Abstract】 Spherical Zn₂SnO₄ nanocrystals,a new possible Li-ion battery anode material,were synthesized by a hydrothermal method. The influence of hydrothermal time on the product structure and the electrode performance of the samples were studied.The micro- structure,morphology and electrochemical performance of the materials were investigated by the X-ray diffraction transmission elec- tron microscopy and electrochemical methods.The results indicate that the hydrothermal time had an effect on the size and crystallin- ity of the as-prepared materials,which consequently affected their electrochemical performance.The Zn₂SnO₄ sample prepared by hydrothermal treatment at 220℃ for 28 h exhibited smaller particle sizes and higher crystallinity,showing a bigger initial discharge capacity of 591.9 mA.h/g at the constant current density of 100 mA/g within the voltage range of 0—1.4 V.The Zn₂SnO₄ sample with bigger particle sizes and lower crystallinity prepared at same temperature for 24 h,exhibited better cycle stability,which retained a capacity of 409.5 mA·h/g after 14 cycles.The Zn₂SnO₄ sample prepared at 220℃ for 24h exhibited a large discharge capacity and good cycle performance,which are necessary for use as Li-ion battery anodes.更多还原