CAJ | 학술논문

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28 h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0～1.4 V电压范围内,达591.9(mA·h)/g;同样温度处理24 h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.
채용수열법합성료신형리리자전지양겁재료Zn2SnO4납미정.연구료수열시간대재료결구、형모급전화학성능적영향.통과X사선연사、투사전경화전화학법표정료산물적결구화형모,병측시료재료적전화학특성.결과표명:수열시간장영향산물적형모、척촌화결정도,종이영향기전화학성능.220 ℃수열처리28 h후,소획득적Zn2SnO4구유교소적과립척촌화교고적결정도,기초시방전비용량,재100mA/g항전류밀도화0～1.4 V전압범위내,체591.9(mA·h)/g;동양온도처리24 h후획득적Zn2SnO4기초시방전용량위502.7mA·h/g,충방전14차후잉유409.5(mA·h)/g.220 ℃수열처리획득적Zn2SnO4구유리리자전지양겁재료응용소수적우이적전화학특성.
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 microstructure, morphology and electrochemical performance of the materials were investigated by the X-ray diffraction transmission electron microscopy and electrochemical methods. The results indicate that the hydrothermal time had an effect on the size and crystallinity 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 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 24 h exhibited a large discharge capacity and good cycle performance, which are necessary for use as Li-ion battery anodes.