The solid electrolyte interphase (SEI) on the surface of lithium metal anodes can dictate the electrochemical performance of lithium-metal-based batteries. Due to ineffective adhesion, the natural SEI layer may detach...The solid electrolyte interphase (SEI) on the surface of lithium metal anodes can dictate the electrochemical performance of lithium-metal-based batteries. Due to ineffective adhesion, the natural SEI layer may detach from the lithium negative electrode during interface fluctuations, thereby deteriorating the electrochemical performance of lithium-metal-based batteries. This work introduces perfluorosiloxane coupling agents as interfacial adhesion promoters, chemically bonding and physically entangling the lithium metal with the SEI via the formation of Li-O-Si bonds with the inorganic reactive groups anchoring to the Li substrate and the organic functional groups participating in the formation of the SEI layer, thus binding with its components. Lithium metal batteries modified with silane coupling agents exhibit superior electrochemical performance compared to unmodified lithium metal batteries. The modified lithium metal battery retains a specific capacity of 162 mAh/g after 200 cycles, while the unmodified lithium metal battery only retains 140 mAh/g.展开更多
The Corona virus causes major changes in the world,among which China-Iran relation is to change more or less under the influence.The worsened relations with the US of both countries are expected to push the two countr...The Corona virus causes major changes in the world,among which China-Iran relation is to change more or less under the influence.The worsened relations with the US of both countries are expected to push the two countries to have a more intimate friendship;the bilateral cooperation and the common interests of both countries also demonstrate a bright future.On the other hand,with the impediment of the second outbreak of the virus,the uncertainty of Iranian attitudes,and the impact of other countries,the improvement of the bilateral interactions is not all plain sailing.The essay aims to give analyses on these factors as well as some reasonable predictions.展开更多
Transportation has played an indispensable role in driving urban development from ancient times to the present.This paper aims to explore the historical evolution of transportation in Chengde and examine the influence...Transportation has played an indispensable role in driving urban development from ancient times to the present.This paper aims to explore the historical evolution of transportation in Chengde and examine the influence of transportation factors on the city's functions from different perspectives.The research reveals that Chengde's urban development has undergone four stages:natural villages before the Liao Dynasty,urban construction from the Liao Dynasty to the Ming Dynasty,urban development from the early to middle Qing Dynasty,and the present era after the reform and opening-up.The study results demonstrate that Chengde's transportation development has undergone significant transformations.It has not only provided essential support for various aspects such as politics,religion,culture,economy,and military during the Qing Dynasty,but also served as a vital guarantee for modern economic development,tourism,arts,and environmental protection.展开更多
文摘The solid electrolyte interphase (SEI) on the surface of lithium metal anodes can dictate the electrochemical performance of lithium-metal-based batteries. Due to ineffective adhesion, the natural SEI layer may detach from the lithium negative electrode during interface fluctuations, thereby deteriorating the electrochemical performance of lithium-metal-based batteries. This work introduces perfluorosiloxane coupling agents as interfacial adhesion promoters, chemically bonding and physically entangling the lithium metal with the SEI via the formation of Li-O-Si bonds with the inorganic reactive groups anchoring to the Li substrate and the organic functional groups participating in the formation of the SEI layer, thus binding with its components. Lithium metal batteries modified with silane coupling agents exhibit superior electrochemical performance compared to unmodified lithium metal batteries. The modified lithium metal battery retains a specific capacity of 162 mAh/g after 200 cycles, while the unmodified lithium metal battery only retains 140 mAh/g.
文摘The Corona virus causes major changes in the world,among which China-Iran relation is to change more or less under the influence.The worsened relations with the US of both countries are expected to push the two countries to have a more intimate friendship;the bilateral cooperation and the common interests of both countries also demonstrate a bright future.On the other hand,with the impediment of the second outbreak of the virus,the uncertainty of Iranian attitudes,and the impact of other countries,the improvement of the bilateral interactions is not all plain sailing.The essay aims to give analyses on these factors as well as some reasonable predictions.
文摘Transportation has played an indispensable role in driving urban development from ancient times to the present.This paper aims to explore the historical evolution of transportation in Chengde and examine the influence of transportation factors on the city's functions from different perspectives.The research reveals that Chengde's urban development has undergone four stages:natural villages before the Liao Dynasty,urban construction from the Liao Dynasty to the Ming Dynasty,urban development from the early to middle Qing Dynasty,and the present era after the reform and opening-up.The study results demonstrate that Chengde's transportation development has undergone significant transformations.It has not only provided essential support for various aspects such as politics,religion,culture,economy,and military during the Qing Dynasty,but also served as a vital guarantee for modern economic development,tourism,arts,and environmental protection.
