【摘要】 采用液相沉淀法制备ZnSn(OH)6前驱体。在不同温度下热处理前驱体,得到Zn-Sn复合氧化物。通过差热/热重分析(TG/DTA)、XRD分析前驱体和Zn-Sn复合氧化物的结构,运用恒流充放电研究了Zn-Sn复合氧化物作为锂离子电池负极材料的电化学性能。结果表明:在300℃和500℃下热处理前驱体得到的是非晶态的ZnSnO3,在670℃、720℃和800℃下热处理得到的是晶态的ZnSnO3和尖晶石型Zn2SnO4。若从容量和循环寿命综合考虑,在发生相变的温度范围(670~720℃)内热分解,得到的产物的电化学性能较差。更多还原

【Abstract】 ZnSn(OH)6 precursor was prepared by the liquid precipitation method.Zn-Sn composite oxides were synthesized by heat-treated precursor at different temperatures.The structures of precursor and Zn-Sn composite oxides were studied by TG/DTA and XRD.The electrochemical performance of Zn-Sn composite oxides as anode materials for Li-ion battery was studied by the galvanostatic charge-discharge.The results showed that the samples with heat treatment temperature at 300 ℃ and 500 ℃ were amorphous ZnSnO3,and the samples with heat treatment temperature at 670 ℃,720 ℃ and 800 ℃ were crystal ZnSnO3 and spinel Zn2SnO4.Based on the general analysis for the capacity and cycle life,the samples heat treatment at phase transition temperature range(670～720 ℃) exhibited worse electrochemical performance.更多还原