核壳结构ZnS纳米颗粒协同碳毡提升锌离子电池的能量密度

Improvement of zinc-ion batteries energy density by core-shell structure ZnS nanoparticles synergistic with carbon felt

通过溶剂热法以及化学气相沉积法(CVD)制备了ZnS@C纳米颗粒作为正极材料用于锌离子电池体系中,并通过制备碳毡夹层来改善电池的电化学性能。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)及恒流充放电测试对材料性能进行表征。结果表明,ZnS@C纳米颗粒加入碳毡夹层后可以显著降低电压的滞后效应,放电平台由0.45 V提高至0.75 V,充电平台由1.6 V降低至1.2 V。采用该正极材料的锌离子电池在100 mA/g电流密度下平均首次放电比容量高达1302 mAh/g,比能量为976.5 Wh/kg,锌硫电池体系的循环稳定性得以明显改善。研究表明,制备核壳结构ZnS纳米颗粒作为正极材料在碳毡的协同作用下可以有效提高锌离子电池的能量密度,并为提升锌离子电池的电化学性能提供了一个新的研究思路。

ZnS@C nanoparticles were prepared by solvothermal method and chemical vapor deposition(CVD)and used as cathode materials in zinc-ion battery system,and the carbon felt interlayer was prepared to improve the electrochemical performance of the battery.The properties of the materials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and constant current charge and discharge test.The results show that the hysteresis effect of voltage can be significantly reduced by adding nano particles into the carbon felt interlayer.The discharge platform increases from 0.45 V to 0.75 V,and the charge platform reduces from 1.6 V to 1.2 V.The zinc-ion battery with the cathode material can show a very high average initial discharge specific capacity of 1302 mAh/g at current density of 100 mA/g,and the energy density is 976.5 Wh/kg.The cycle stability of the zinc sulfur battery system is significantly improved.The results show that the preparation of coreshell ZnS nanoparticles as cathode material with carbon felt can effectively improve the energy density of zinc-ion battery and provide a new idea for improving the electrochemical performance of zinc-ion battery.