Lithium metal batteries with inorganic solid-state electrolytes have emerged as strong and attractive candidates for electrochemical energy storage devices because of their high-energy content and safety.Nonetheless,i...Lithium metal batteries with inorganic solid-state electrolytes have emerged as strong and attractive candidates for electrochemical energy storage devices because of their high-energy content and safety.Nonetheless,inherent challenges of deleterious lithium dendrite growth and poor interfacial stability hinder their commercial application.Herein,we report a liquid metal-coated lithium metal(LM@Li)anode strategy to improve the contact between lithium metal and a Li6PS5Cl inorganic electrolyte.The LM@Li symmetric cell shows over 1000 h of stable lithium plating/stripping cycles at 2mA cm^(-2) and a significantly higher critical current density of 9.8 mAcm^(-2) at 25°C.In addition,a full battery assembled with a high-capacity composite LiNbO3@-LiNi_(0.7)Co_(0.2)Mn_(0.1)O_(2)(LNO@NCM721)cathode shows stable cycling performance.Experimental and computational results have demonstrated that dendrite growth tolerance and physical contact in solid-state batteries can be reinforced by using LM interlayers for interfacial modification.展开更多
过渡金属硫化物作为钾离子电池的高理论容量阳极,由于其电导率低、循环过程体积膨胀大,导致其倍率性能和循环稳定性较差.本文采用氧化石墨烯(GO)来控制纳米颗粒在纤维中的粒径和分布,以提高复合纤维的导电性和拉伸变形.此外,由异质结构...过渡金属硫化物作为钾离子电池的高理论容量阳极,由于其电导率低、循环过程体积膨胀大,导致其倍率性能和循环稳定性较差.本文采用氧化石墨烯(GO)来控制纳米颗粒在纤维中的粒径和分布,以提高复合纤维的导电性和拉伸变形.此外,由异质结构和氧化石墨烯组成的三维导电碳网络(ZnS-CoS@GO@CNFs)可以加速钾离子储存的动力学并稳定钾离子储存.作为钾离子电池的阳极材料,该复合材料在3 A g^(−1)下具有210 mA h g^(−1)的优异倍率性能.在2 A g^(−1)的大电流下经历2800次循环后仍表现出171 mA h g^(−1)的容量,容量保持率为97.7%.此外,当纳米纤维膜用作自支撑阳极时,仍然可以保持稳定的容量输出(在0.1 A g^(−1)下100次循环后容量为302 mA h g^(−1)).由钾离子混合电容器组装的可折叠袋状电池在多角度重复弯曲和最终恢复的情况下仍然可以安全地工作,并且可以提供大的能量密度(134 W h kg^(−1))和功率密度(5815 W kg^(−1)).优异的电化学性能进一步揭示了多功能氧化石墨烯复合纤维膜的应用前景.展开更多
基金financially supported by the Shenzhen Science and Technology Program (Grant No.KQTD20200820113045083,ZDSYS20190902093220279,and JCYJ20220818102403007)the National Natural Science Foundation of China (52201257)the Shenzhen Research Fund for Returned Scholars (DD11409017).
文摘Lithium metal batteries with inorganic solid-state electrolytes have emerged as strong and attractive candidates for electrochemical energy storage devices because of their high-energy content and safety.Nonetheless,inherent challenges of deleterious lithium dendrite growth and poor interfacial stability hinder their commercial application.Herein,we report a liquid metal-coated lithium metal(LM@Li)anode strategy to improve the contact between lithium metal and a Li6PS5Cl inorganic electrolyte.The LM@Li symmetric cell shows over 1000 h of stable lithium plating/stripping cycles at 2mA cm^(-2) and a significantly higher critical current density of 9.8 mAcm^(-2) at 25°C.In addition,a full battery assembled with a high-capacity composite LiNbO3@-LiNi_(0.7)Co_(0.2)Mn_(0.1)O_(2)(LNO@NCM721)cathode shows stable cycling performance.Experimental and computational results have demonstrated that dendrite growth tolerance and physical contact in solid-state batteries can be reinforced by using LM interlayers for interfacial modification.
基金supported by the National Natural Science Foundation of China(51772082 and 51804106)the Science and Technology Projects of the State Grid Corporation of China(5500-202323102A-1-1-ZN)the Natural Science Foundation of Hunan Province(2023JJ10005).
文摘过渡金属硫化物作为钾离子电池的高理论容量阳极,由于其电导率低、循环过程体积膨胀大,导致其倍率性能和循环稳定性较差.本文采用氧化石墨烯(GO)来控制纳米颗粒在纤维中的粒径和分布,以提高复合纤维的导电性和拉伸变形.此外,由异质结构和氧化石墨烯组成的三维导电碳网络(ZnS-CoS@GO@CNFs)可以加速钾离子储存的动力学并稳定钾离子储存.作为钾离子电池的阳极材料,该复合材料在3 A g^(−1)下具有210 mA h g^(−1)的优异倍率性能.在2 A g^(−1)的大电流下经历2800次循环后仍表现出171 mA h g^(−1)的容量,容量保持率为97.7%.此外,当纳米纤维膜用作自支撑阳极时,仍然可以保持稳定的容量输出(在0.1 A g^(−1)下100次循环后容量为302 mA h g^(−1)).由钾离子混合电容器组装的可折叠袋状电池在多角度重复弯曲和最终恢复的情况下仍然可以安全地工作,并且可以提供大的能量密度(134 W h kg^(−1))和功率密度(5815 W kg^(−1)).优异的电化学性能进一步揭示了多功能氧化石墨烯复合纤维膜的应用前景.
