Lithium metal is considered a desirable anode for the nextgeneration high-energy-density rechargeable energy storage devices.Unfortunately,poor lifespan and safety issues caused by unexpected dendrites growth have pre...Lithium metal is considered a desirable anode for the nextgeneration high-energy-density rechargeable energy storage devices.Unfortunately,poor lifespan and safety issues caused by unexpected dendrites growth have prevented the commercialization of Li metal anode.展开更多
钾离子电池(PIBs)面临的一个关键问题是设计具有先进结构的负极材料,以实现快速电荷传输以提高钾的存储性能.采用碳二亚胺铁(FeNCN)作为阳极,由于其含有一定数量的共价键且在分子水平上具有稳定的结构,使得储钾系统能够实现优异的电化...钾离子电池(PIBs)面临的一个关键问题是设计具有先进结构的负极材料,以实现快速电荷传输以提高钾的存储性能.采用碳二亚胺铁(FeNCN)作为阳极,由于其含有一定数量的共价键且在分子水平上具有稳定的结构,使得储钾系统能够实现优异的电化学性能.FeNCN阳极具有高导电性,带隙接近0 eV,并且由于其共价键结构具有良好的结构稳定性.此外,无定形反应产物也为离子扩散提供了多种途径.因此,FeNCN阳极表现出高可逆比容量(在50 mA g^(-1)电流密度下具有600 mA h g^(-1)比容量),显著的倍率性能和长寿命循环(电流密度为500 mA g^(-1)时拥有400 mA h g^(-1)比容量且超过300次循环).通过理论模拟、X射线原位衍射分析和X射线光电子能谱分析揭示了Fe^(2+)和K^(+)之间的转化反应机理.此外,将FeNCN负极与苝-3,4,9,10-四羧酸二酐正极材料匹配,组装成的全电池在198.6 Wkg^(-1)的功率密度下实现了184.7 W h kg^(-1)的超高能量密度,明显高于以往所有铁基负极的PIBs或钾离子混合电容器.展开更多
Quantum mechanics imposes limits on measurement accuracy through quantum noise which typically has two components:First is the shot noise originating from vacuum fluctuations and referred to as the imprecision noise.S...Quantum mechanics imposes limits on measurement accuracy through quantum noise which typically has two components:First is the shot noise originating from vacuum fluctuations and referred to as the imprecision noise.Second is the quantum backaction originating from the“action”of the measurement back on the object being measured.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52074113,22005091 and 22005092)Hunan University Outstanding Youth Science Foundation(No.531118040319)+5 种基金the Science and Technology Innovation Program of Hunan Province(No.2021RC3055)the CITIC Metals Ningbo Energy Co.Ltd.(No.H202191380246)Chongqing Talents:Exceptional Young Talents Project(No.CQYC202105015)Shenzhen Virtual University Park Basic Research Project of Free exploration(No.2021Szvup036)the Graduate Research and Innovation Projects of Hunan Province(No.QL20210088)the Pennsylvania State University Start-Up Fund。
文摘Lithium metal is considered a desirable anode for the nextgeneration high-energy-density rechargeable energy storage devices.Unfortunately,poor lifespan and safety issues caused by unexpected dendrites growth have prevented the commercialization of Li metal anode.
基金financial support from the National Natural Science Foundation of China(92163116),the support from the National Natural Science Foundation of China(22209043)the Major Program of the Natural Science Foundation of Hunan Province(2021JC0006)。
基金financially supported by the National Natural Science Foundation of China(52074113,22005091 and 22005092)Hunan University Outstanding Youth Science Foundation(531118040319)+4 种基金the Science and Technology Innovation Program of Hunan Province(2021RC3055)Changsha Municipal Natural Science Foundation(43184)the CITIC Metals Ningbo Energy Co.,Ltd.(H202191380246)Chongqing Talents:Exceptional Young Talents Project(CQYC202105015)Shenzhen Virtual University Park Basic Research Project of Free exploration(2021Szvup036)。
文摘钾离子电池(PIBs)面临的一个关键问题是设计具有先进结构的负极材料,以实现快速电荷传输以提高钾的存储性能.采用碳二亚胺铁(FeNCN)作为阳极,由于其含有一定数量的共价键且在分子水平上具有稳定的结构,使得储钾系统能够实现优异的电化学性能.FeNCN阳极具有高导电性,带隙接近0 eV,并且由于其共价键结构具有良好的结构稳定性.此外,无定形反应产物也为离子扩散提供了多种途径.因此,FeNCN阳极表现出高可逆比容量(在50 mA g^(-1)电流密度下具有600 mA h g^(-1)比容量),显著的倍率性能和长寿命循环(电流密度为500 mA g^(-1)时拥有400 mA h g^(-1)比容量且超过300次循环).通过理论模拟、X射线原位衍射分析和X射线光电子能谱分析揭示了Fe^(2+)和K^(+)之间的转化反应机理.此外,将FeNCN负极与苝-3,4,9,10-四羧酸二酐正极材料匹配,组装成的全电池在198.6 Wkg^(-1)的功率密度下实现了184.7 W h kg^(-1)的超高能量密度,明显高于以往所有铁基负极的PIBs或钾离子混合电容器.
文摘Quantum mechanics imposes limits on measurement accuracy through quantum noise which typically has two components:First is the shot noise originating from vacuum fluctuations and referred to as the imprecision noise.Second is the quantum backaction originating from the“action”of the measurement back on the object being measured.
