The exertion of superior high-energy density based on multivalent ions transfer of rechargeable aluminum batteries is greatly hindered by limited electrochemical stability window of typical water in salt electrolyte(W...The exertion of superior high-energy density based on multivalent ions transfer of rechargeable aluminum batteries is greatly hindered by limited electrochemical stability window of typical water in salt electrolyte(Wi SE). Recently, it is reported that a second salt addition to the Wi SE can offer further suppression of water activities, and achieves a much wider electrochemical window compared with aqueous Wi SE electrolytes. Hence, we demonstrate a class of water in bi-salt electrolyte containing the trifluoromethanesulfonate(OTF), which exhibits an ultra-wide electrochemical window of 4.35 V and a very low overpotential of 14.6 m V. Moreover, the interface chemistry between cathode and electrolyte is also confirmed via kinetic analysis. Surprisingly, we find the electrolyte can effectively suppress Mn dissolution from the cathode, alleviate self-discharge behavior, and ensure a stable electrode–electrolyte interface based on the interface concentrated-confinement effect. Owing to these unique merits of water in bi-salt electrolyte, the AlxMnO_(2)·nH_(2)O material delivers a high capacity of 364 m Ah g;and superb long-term cycling performance > 150 cycles with a capacity decay rate of 0.37% per cycle with coulombic efficiency at ca. 95%.展开更多
In this paper,we study minimal Legendrian surfacesΣimmersed in the tangent sphere bundle T_(1)R^(3).We classify(1)totally geodesic Legendrian surfaces,(2)closed minimal Legendrian surfaces of genus smaller than or eq...In this paper,we study minimal Legendrian surfacesΣimmersed in the tangent sphere bundle T_(1)R^(3).We classify(1)totally geodesic Legendrian surfaces,(2)closed minimal Legendrian surfaces of genus smaller than or equal to 1 and complete minimal Legendrian surfaces with the non-negative Gauss curvature,and(3)complete stable minimal Legendrian surfaces.展开更多
Layered Li-rich oxides have attracted much attention because of higher capacity than that of traditional layered oxides(more than 250 mAh g^(−1)).However,the intrinsic issues of Li-rich cathode materials suffer from l...Layered Li-rich oxides have attracted much attention because of higher capacity than that of traditional layered oxides(more than 250 mAh g^(−1)).However,the intrinsic issues of Li-rich cathode materials suffer from lattice oxygen loss,poor rate capability,voltage fade,and limited cycle life.To tackle these problems,the Li-rich cathode containing intergrown layer and spinel phases was proposed,and this heterostructure material meets the requirements of high energy and stable surface with a fast Li^(+)diffusion channel.Herein,we review the recent progress and in-depth understanding about heterostructure including microstructure and morphology,performance of advancement and degradation mechanisms,and modification strategies.Special attention is given to the high-performance energy mechanism as follows:(a)spinel phase and oxygen vacancy jointly enhance the lattice structure and prevent the irreversible oxygen release,(b)higher capacity is achieved by promotion of activation of Li_(2)MnO_(3) phase and control of the activation rate to realize stable long-term cyclability,and(c)spinel phase provides the 3D interconnected Li^(+)diffusion channels and protects the surface region from side reactions.The other issue that aroused interest is the undesirable changes of phase transition and degradation mechanisms as follows:(a)the key reconstruction process is to produce a“good”spinel to maintain the surface and interior structure stability.(b)It is significant to figure out the structure degradation and phase transition mechanism in the cycled heterostructure.This review aims to provide inspiration and opportunities for the design of high-energy-density cathode materials,thereby bridging the gap between laboratory research and practical battery applications.展开更多
基金supported by the National Natural Science Foundation of China(22075028)。
文摘The exertion of superior high-energy density based on multivalent ions transfer of rechargeable aluminum batteries is greatly hindered by limited electrochemical stability window of typical water in salt electrolyte(Wi SE). Recently, it is reported that a second salt addition to the Wi SE can offer further suppression of water activities, and achieves a much wider electrochemical window compared with aqueous Wi SE electrolytes. Hence, we demonstrate a class of water in bi-salt electrolyte containing the trifluoromethanesulfonate(OTF), which exhibits an ultra-wide electrochemical window of 4.35 V and a very low overpotential of 14.6 m V. Moreover, the interface chemistry between cathode and electrolyte is also confirmed via kinetic analysis. Surprisingly, we find the electrolyte can effectively suppress Mn dissolution from the cathode, alleviate self-discharge behavior, and ensure a stable electrode–electrolyte interface based on the interface concentrated-confinement effect. Owing to these unique merits of water in bi-salt electrolyte, the AlxMnO_(2)·nH_(2)O material delivers a high capacity of 364 m Ah g;and superb long-term cycling performance > 150 cycles with a capacity decay rate of 0.37% per cycle with coulombic efficiency at ca. 95%.
基金supported by National Natural Science Foundation of China(Grant No.11901534)。
文摘In this paper,we study minimal Legendrian surfacesΣimmersed in the tangent sphere bundle T_(1)R^(3).We classify(1)totally geodesic Legendrian surfaces,(2)closed minimal Legendrian surfaces of genus smaller than or equal to 1 and complete minimal Legendrian surfaces with the non-negative Gauss curvature,and(3)complete stable minimal Legendrian surfaces.
基金supported by the National Natural Science Foundation of China(22179008 and 21875022)the Yibin“Jie Bang Gua Shuai”(2022JB004)+1 种基金support from the Postdoctoral Fellowship Program of CPSF(GZB20230931)the Special Support of Chongqing Postdoctoral Research Project(2023CQBSHTB2041).
文摘Layered Li-rich oxides have attracted much attention because of higher capacity than that of traditional layered oxides(more than 250 mAh g^(−1)).However,the intrinsic issues of Li-rich cathode materials suffer from lattice oxygen loss,poor rate capability,voltage fade,and limited cycle life.To tackle these problems,the Li-rich cathode containing intergrown layer and spinel phases was proposed,and this heterostructure material meets the requirements of high energy and stable surface with a fast Li^(+)diffusion channel.Herein,we review the recent progress and in-depth understanding about heterostructure including microstructure and morphology,performance of advancement and degradation mechanisms,and modification strategies.Special attention is given to the high-performance energy mechanism as follows:(a)spinel phase and oxygen vacancy jointly enhance the lattice structure and prevent the irreversible oxygen release,(b)higher capacity is achieved by promotion of activation of Li_(2)MnO_(3) phase and control of the activation rate to realize stable long-term cyclability,and(c)spinel phase provides the 3D interconnected Li^(+)diffusion channels and protects the surface region from side reactions.The other issue that aroused interest is the undesirable changes of phase transition and degradation mechanisms as follows:(a)the key reconstruction process is to produce a“good”spinel to maintain the surface and interior structure stability.(b)It is significant to figure out the structure degradation and phase transition mechanism in the cycled heterostructure.This review aims to provide inspiration and opportunities for the design of high-energy-density cathode materials,thereby bridging the gap between laboratory research and practical battery applications.
