Lithium metal is one of the most promising anodes for lithium batteries because of their high theoretical specific capacity and the low electrochemical potential.However,the commercialization of lithium metal anodes(L...Lithium metal is one of the most promising anodes for lithium batteries because of their high theoretical specific capacity and the low electrochemical potential.However,the commercialization of lithium metal anodes(LMAs)is facing significant obstacles,such as uncontrolled lithium dendrite growth and unstable solid electrolyte interface,leading to inferior Coulombic efficiency,unsatisfactory cycling stability and even serious safety issues.Introducing low-cost natural clay-based materials(NCBMs)in LMAs is deemed as one of the most effective methods to solve aforementioned issues.These NCBMs have received considerable attention for stabilizing LMAs due to their unique structure,large specific surface areas,abundant surface groups,high mechanical strength,excellent thermal stability,and environmental friendliness.Considering the rapidly growing research enthusiasm for this topic in the last several years,here,we review the recent progress on the application of NCBMs in stable and dendrite-free LMAs.The different structures and modification methods of natural clays are first summarized.In addition,the relationship between their modification methods and nano/microstructures,as well as their impact on the electrochemical properties of LMAs are systematically discussed.Finally,the current challenges and opportunities for application of NCBMs in stable LMAs are also proposed to facilitate their further development.展开更多
For the geological disposal of high level radioactive wastes, an excavation damaged zone （EDZ） having high hydraulic conductivity resulting from the development of fractures in the rock adjacent to the tunnels will ...For the geological disposal of high level radioactive wastes, an excavation damaged zone （EDZ） having high hydraulic conductivity resulting from the development of fractures in the rock adjacent to the tunnels will be one of the potential pathways for radioactive contaminant transport. The potential pathways will be sealed by closure components, that is, a combination of tunnel plug, backfill and grout, the latter material being a clay-based mixture in consideration of the need for long-term stability of the seals. Clay-based grout is one of the effective candidate materials that can be used to interrupt the migration of radionuclides through an EDZ. Laboratory testing of clay-based grout using pulverized bentonite, with the objective of improvement in grout penetration into a rockmass, was conducted. The results showed that the pulverization of clay-based grout had a positive effect on filtration.展开更多
3D printing of cementitious material can provide an affordable,sustainable,and optimized approach for the construction of homes,without compromising quality or craftsmanship.While most of the current research and deve...3D printing of cementitious material can provide an affordable,sustainable,and optimized approach for the construction of homes,without compromising quality or craftsmanship.While most of the current research and development efforts in this field are focused on cement-based concrete printing,this paper focuses on the current state-of-the-art literature review of designing and developing a sustainable clay-based mixture design that mainly includes clay,sand,straw,lime,and water.The goal of this paper is to bridge the gap between typical traditional earth construction,specifically cob construction,and emerging 3D printing of cementitious materials.The specific objective of this paper is to offer some possible changes in the typical cob mixture so that it can be used for 3D printing of clay-based mixtures with sufficient flowability,buildability,strength,and open time(i.e.,the time period between printing of one layer and printing of another layer deposited on a layer below).The paper describes typical clay-based mixtures and their traditional process and then specifies the challenges in going from traditional cob construction to advanced computer-controlled robotic 3D printing.展开更多
基金supported by the Henan Province Science and Technology Research Project(No.232102241006)the National Key Research and Development Program of China(No.2020YFB1713500)+2 种基金Opening Project of National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials&Henan Key Laboratory of High-temperature Structural and Functional Materials,Henan University of Science and Technology(No.HKDNM2019013)the Open Fund of State Key Laboratory of Advanced Refractories(No.SKLAR202210)the Major Science and Technology Projects of Henan Province(No.221100230200)。
文摘Lithium metal is one of the most promising anodes for lithium batteries because of their high theoretical specific capacity and the low electrochemical potential.However,the commercialization of lithium metal anodes(LMAs)is facing significant obstacles,such as uncontrolled lithium dendrite growth and unstable solid electrolyte interface,leading to inferior Coulombic efficiency,unsatisfactory cycling stability and even serious safety issues.Introducing low-cost natural clay-based materials(NCBMs)in LMAs is deemed as one of the most effective methods to solve aforementioned issues.These NCBMs have received considerable attention for stabilizing LMAs due to their unique structure,large specific surface areas,abundant surface groups,high mechanical strength,excellent thermal stability,and environmental friendliness.Considering the rapidly growing research enthusiasm for this topic in the last several years,here,we review the recent progress on the application of NCBMs in stable and dendrite-free LMAs.The different structures and modification methods of natural clays are first summarized.In addition,the relationship between their modification methods and nano/microstructures,as well as their impact on the electrochemical properties of LMAs are systematically discussed.Finally,the current challenges and opportunities for application of NCBMs in stable LMAs are also proposed to facilitate their further development.
文摘For the geological disposal of high level radioactive wastes, an excavation damaged zone （EDZ） having high hydraulic conductivity resulting from the development of fractures in the rock adjacent to the tunnels will be one of the potential pathways for radioactive contaminant transport. The potential pathways will be sealed by closure components, that is, a combination of tunnel plug, backfill and grout, the latter material being a clay-based mixture in consideration of the need for long-term stability of the seals. Clay-based grout is one of the effective candidate materials that can be used to interrupt the migration of radionuclides through an EDZ. Laboratory testing of clay-based grout using pulverized bentonite, with the objective of improvement in grout penetration into a rockmass, was conducted. The results showed that the pulverization of clay-based grout had a positive effect on filtration.
文摘3D printing of cementitious material can provide an affordable,sustainable,and optimized approach for the construction of homes,without compromising quality or craftsmanship.While most of the current research and development efforts in this field are focused on cement-based concrete printing,this paper focuses on the current state-of-the-art literature review of designing and developing a sustainable clay-based mixture design that mainly includes clay,sand,straw,lime,and water.The goal of this paper is to bridge the gap between typical traditional earth construction,specifically cob construction,and emerging 3D printing of cementitious materials.The specific objective of this paper is to offer some possible changes in the typical cob mixture so that it can be used for 3D printing of clay-based mixtures with sufficient flowability,buildability,strength,and open time(i.e.,the time period between printing of one layer and printing of another layer deposited on a layer below).The paper describes typical clay-based mixtures and their traditional process and then specifies the challenges in going from traditional cob construction to advanced computer-controlled robotic 3D printing.
