通过一步溶剂热法制备了层间距0.75 nm的三元Fe_(x)Mo_(1-x)S_(2),扩大的层间距改善了Na^(+)首次循环过程中扩散速率。Fe_(x)Mo_(1-x)S_(2)作为钠离子电池负极在0.1 A/g电流密度循环100圈后可逆容量为285 m A·h/g,同时显示出较好...通过一步溶剂热法制备了层间距0.75 nm的三元Fe_(x)Mo_(1-x)S_(2),扩大的层间距改善了Na^(+)首次循环过程中扩散速率。Fe_(x)Mo_(1-x)S_(2)作为钠离子电池负极在0.1 A/g电流密度循环100圈后可逆容量为285 m A·h/g,同时显示出较好倍率性能(5 A/g电流密度下容量为178 m A·h/g)。通过X射线光电子能谱仪和透射电子显微镜对循环前后电极材料进行了表征,分析Fe_(x)Mo_(1-x)S_(2)在循环过程中的电化学反应机理。结果表明:Fe_(x)Mo_(1-x)S_(2)与Na^(+)发生不可逆转换反应,多次循环后生成Fe-Mo合金和S。展开更多
Metallic Zn can be used as an anode for aqueous zinc-ion batteries due to its low redox potential,rich resources,and high theoretical capacity.However,its practical application is limited by dendrite growth and side r...Metallic Zn can be used as an anode for aqueous zinc-ion batteries due to its low redox potential,rich resources,and high theoretical capacity.However,its practical application is limited by dendrite growth and side reactions.Herein,a simple in-situ growth strategy was applied to fabricate a Zn anode with a ZnO protective layer(Zn/ZnO)to lengthen the cycle life and inhibit the dendrite growth and side reactions.At 1 mA h cm^(−2)capacity,Zn/ZnO exhibits long-time stability(2500 h)at 1 mA cm^(−2)and outstanding rate capability(1000 h at 10 mA cm^(−2))in symmetrical cells.Furthermore,the average coulombic efficiency of the Zn/ZnO//Ti cell is 99.4%,which is desirable at 5 mA cm^(−2).In addition,the Zn/ZnO//MnO_(2)cell can maintain a specific capacity of 167.2 mA h g^(−1)after 800 stable cycles.This work presents a simple fabrication method for Zn anode with excellent performance and suggests the huge possibilities of implementing practically rechargeable aqueous zinc-ion batteries.展开更多
文摘通过一步溶剂热法制备了层间距0.75 nm的三元Fe_(x)Mo_(1-x)S_(2),扩大的层间距改善了Na^(+)首次循环过程中扩散速率。Fe_(x)Mo_(1-x)S_(2)作为钠离子电池负极在0.1 A/g电流密度循环100圈后可逆容量为285 m A·h/g,同时显示出较好倍率性能(5 A/g电流密度下容量为178 m A·h/g)。通过X射线光电子能谱仪和透射电子显微镜对循环前后电极材料进行了表征,分析Fe_(x)Mo_(1-x)S_(2)在循环过程中的电化学反应机理。结果表明:Fe_(x)Mo_(1-x)S_(2)与Na^(+)发生不可逆转换反应,多次循环后生成Fe-Mo合金和S。
基金supported by the National Natural Science Foundation of China (Grant Nos. 22179071 and 52072217)
文摘Metallic Zn can be used as an anode for aqueous zinc-ion batteries due to its low redox potential,rich resources,and high theoretical capacity.However,its practical application is limited by dendrite growth and side reactions.Herein,a simple in-situ growth strategy was applied to fabricate a Zn anode with a ZnO protective layer(Zn/ZnO)to lengthen the cycle life and inhibit the dendrite growth and side reactions.At 1 mA h cm^(−2)capacity,Zn/ZnO exhibits long-time stability(2500 h)at 1 mA cm^(−2)and outstanding rate capability(1000 h at 10 mA cm^(−2))in symmetrical cells.Furthermore,the average coulombic efficiency of the Zn/ZnO//Ti cell is 99.4%,which is desirable at 5 mA cm^(−2).In addition,the Zn/ZnO//MnO_(2)cell can maintain a specific capacity of 167.2 mA h g^(−1)after 800 stable cycles.This work presents a simple fabrication method for Zn anode with excellent performance and suggests the huge possibilities of implementing practically rechargeable aqueous zinc-ion batteries.
