The production of polysulfides during discharging and their solubility in electrolytes are issues encountered in lithium–sulfur batteries.In this study,a novel chalcopyrite material with fixed sulfur was developed ba...The production of polysulfides during discharging and their solubility in electrolytes are issues encountered in lithium–sulfur batteries.In this study,a novel chalcopyrite material with fixed sulfur was developed based on its chemical affinity for lithium–sulfur batteries.Pure micro-sized chalcopyrite(CuFeS2)was prepared from its natural ore by simple flotation.Sulfur in the prepared chalcopyrite can be fixed in the electrode during charging–discharging because copper and iron are sulfur-friendly elements in nature.The fixing of sulfur leads to a high initial charge capacity(1300 mA h g^(−1)at the initial discharge current density of 100 mA g^(−1)),excellent rate performance,and good cycling properties.The discharge capacities are approximately 1200,1050,970,930,and 875 mA h g^(−1)at current densities of 100,200,300,500,and 1000 mA g^(−1),respectively.When the current density is reduced to 100 mA g^(−1),the reversible capacity can recover to 1000 mA h g^(−1),and the cyclability becomes impressive(initial capacity of 1130 mA h g^(−1),and 767 mA h g^(−1)is maintained for 100 cycles at a high current density of 1000 mA g^(−1)).Given the abundance of chalcopyrite in nature and the simplicity and low cost of flotation extraction,chalcopyrite exhibits potential to be applied to lithium–sulfur batteries.展开更多
基金supported by the Collaborative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources,Found of State Key Laboratory of Mineral Processing(BGRIMM-KJSKL-2017-13)the National Key Research and Development Program of China(2017YFB0102000)the Young Elite Scientists Sponsorship Program by CAST(2018QNRC001).
文摘The production of polysulfides during discharging and their solubility in electrolytes are issues encountered in lithium–sulfur batteries.In this study,a novel chalcopyrite material with fixed sulfur was developed based on its chemical affinity for lithium–sulfur batteries.Pure micro-sized chalcopyrite(CuFeS2)was prepared from its natural ore by simple flotation.Sulfur in the prepared chalcopyrite can be fixed in the electrode during charging–discharging because copper and iron are sulfur-friendly elements in nature.The fixing of sulfur leads to a high initial charge capacity(1300 mA h g^(−1)at the initial discharge current density of 100 mA g^(−1)),excellent rate performance,and good cycling properties.The discharge capacities are approximately 1200,1050,970,930,and 875 mA h g^(−1)at current densities of 100,200,300,500,and 1000 mA g^(−1),respectively.When the current density is reduced to 100 mA g^(−1),the reversible capacity can recover to 1000 mA h g^(−1),and the cyclability becomes impressive(initial capacity of 1130 mA h g^(−1),and 767 mA h g^(−1)is maintained for 100 cycles at a high current density of 1000 mA g^(−1)).Given the abundance of chalcopyrite in nature and the simplicity and low cost of flotation extraction,chalcopyrite exhibits potential to be applied to lithium–sulfur batteries.
