利用ZnO和Sn的熔点不同,采用中热固相合成法,制备了ZnO/Sn复合材料。透射电镜(TEM)和能谱(EDS)图表明Sn附着在ZnO颗粒表面,X射线衍射(XRD)和X射线光电子能谱(XPS)表征证实了复合材料中Sn的存在。金属Sn具有良好的导电性,循环伏安(CV)和电化学阻抗谱(EIS)测试结果表明含Sn量为3%时复合材料的电化学性能最佳。用其作为锌负极活性材料,制备的NiZn电池在循环稳定性测试中显示其最高能量密度可达176.77Wh/kg,2000次循环后电池仍保持174.13Wh/kg的能量密度和94.23%的库仑效率,展现出长的循环寿命。这种基于熔点差异的低温合成方法为其他功能复合材料的制备提供了新的思路。
ZnO/Sn composites were successfully prepared via medium-temperature solid-phase method by using the melting point difference between ZnO and Sn.TEM and EDS images showed that Sn was attached to the surface of ZnO particles.XRD and XPS characterization further confirmed the presence of Sn in the composites.Owing to the high conductivity of Sn,the composite with 3wt% Sn exhibited the optimal electrochemical performance,as demonstrated by CV and EIS measurements.NiZn battery prepared by using it as a zinc anode active material showed a maximum energy density of 176.77Wh/kg in the cycle stability test.After 2000 cycles,the battery still maintained an energy density of 174.13Wh/kg and a coulombic efficiency of 94.23%,demonstrating exceptional cycling stability.This work presents a novel low-temperature synthesis strategy based on melting point differences,offering a promising approach for designing other functional composite materials.
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基金资助
江苏省重点研发计划(社会发展)-面上项目(BE2021640);江苏理工学院研究生科研与实践创新计划项目(XSJCX23-84)
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