Weak water stability and lithium reactivity are two major stability issues of sulfide solid-state electrolytes(SSEs)for all-solid-state lithium metal batteries.Here,we report on nano-sized boron nitride(BN)-coated Li_...Weak water stability and lithium reactivity are two major stability issues of sulfide solid-state electrolytes(SSEs)for all-solid-state lithium metal batteries.Here,we report on nano-sized boron nitride(BN)-coated Li_(5.7)PS_(4.7)Cl_(1.3)(BN@LPSC1.3)sulfide SSE,which exhibits reduced H_(2)S emission and improved ionic conductivity retention after relative humidity 1.2%-1.5%ambient condition exposure.Furthermore,BN can partially react with lithium metal to create stable Li_(3)N,resulting in BN@LPSC1.3 showing reduced reactivity against lithium metal and a higher critical current density of 2.2mA/cm^(2).The Li/BN@LPSC/Li symmetrical battery also shows considerably greater stability for>2000 h at a current density of 0.1mA/cm^(2).Despite the high cathode mass loading of 13.38mg/cm^(2),the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/BN@LPSC1.3/Li all-solidstate lithium metal battery achieves 84.34%capacity retention even after 500 cycles at 0.1 C and room temperature(25℃).展开更多
Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity o...Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity of B4C coating were manufactured by plasma spray. It was lamellar packing and dense. The B4C coating examined here contained two principal structures and two impurity phase besides major phase. The relatively small value of Young's modulus, comparing with that of the bulk materials, is explained by porosity . The Fe impurity phase could account for the relatively high electrical conductivity of boron carbide coating by comparing with the general boron carbide materials.展开更多
Boron has high mass and volume calorific values,but it is difficult to ignite and has low combustion efficiency.This literature review summarizes the strategies that are used to solve the above-mentioned problems,whic...Boron has high mass and volume calorific values,but it is difficult to ignite and has low combustion efficiency.This literature review summarizes the strategies that are used to solve the above-mentioned problems,which include coatings of boron by using fluoride compounds,energetic composites,metal fuels,and metal oxides.Coating techniques include recrystallization,dual-solvent,phase transfer,electrospinning,etc.As one of the effective coating agents,the fluorine compounds can react with the oxide shell of boron powder.In comparison,the energetic composites can effectively improve the flame temperature of boron powder and enhance the evaporation efficiency of oxide film as a condensed product.Metals and metal oxides would react with boron powder to form metal borides with a lower ignition point,which could reduce its ignition temperature.展开更多
Efficient and environmentally friendly production of high-quality continuous fiber coatings using current preparation methods is highly challenging due to issues such as scale and batch processing restrictions,low dep...Efficient and environmentally friendly production of high-quality continuous fiber coatings using current preparation methods is highly challenging due to issues such as scale and batch processing restrictions,low deposition rate,high energy consumption,and utilization of multiple environmentally hazardous steps.To address these challenges,we propose a stable and efficient wet chemical deposition coating method for high-throughput online continuous preparation of boron nitride(BN)coatings on ceramic fibers under an ambient environment.Our process involves surface modification,in-situ wet chemical deposition,and heat treatment,and all seamlessly connecting with the ceramic fiber preparation process through continuous stretching.Hydrophilic groups were introduced via surface modification enhancing wettability of the fiber surface with impregnating solution.An in-situ reaction and atom migration improve uniformity and binding of the coating.As a result,outstanding impregnation and adhesion properties are achieved.A comprehensive analysis to evaluate the impact of the BN coatings was conducted,which demonstrates that the BN-coated fibers exhibit a remarkable 36%increase in tensile strength,a 133%increase in fracture toughness,and enhanced temperature resistance of up to 1600℃.It provides a secure and efficient platform for cost-effective production of functional and high-quality coatings through targeted surface modification and rapid stretching impregnation.展开更多
THGEMs based on a ceramic substrate have been successfully developed for neutron and single photon detection. The influences on thermal neutron scattering and internal radioactivity of both ceramic and FR-4 substrates...THGEMs based on a ceramic substrate have been successfully developed for neutron and single photon detection. The influences on thermal neutron scattering and internal radioactivity of both ceramic and FR-4 substrates were studied and compared. The ceramic THGEMs are homemade, of 200 μm hole diameter, 600 μm pitch,200 μm thickness, 80 μm rim, and 50 mm×50 mm sensitive area. FR-4 THGEMs with the same geometry were used as a reference. The gas gain, energy resolution and gain stability were measured in different gas mixtures using5.9 ke V X-rays. The maximum gain of a single layer ceramic THGEM reaches 6×104and 1.5×104at Ne＋CH4=95：5and Ar ＋ i-C4 H10 = 97：3, respectively. The energy resolution is better than 24%. Good gain stability was obtained during a more than 100 hour continuous test in Ar＋CO2=80：20. By using a239 Pu source, the alpha deposited energy spectrum and gain curve of the ceramic THGEM were measured.展开更多
基金financial support from the Science and Technology Project of Shenzhen(Nos.JCYJ20210324094206019 and JCYJ20210324094000001).
文摘Weak water stability and lithium reactivity are two major stability issues of sulfide solid-state electrolytes(SSEs)for all-solid-state lithium metal batteries.Here,we report on nano-sized boron nitride(BN)-coated Li_(5.7)PS_(4.7)Cl_(1.3)(BN@LPSC1.3)sulfide SSE,which exhibits reduced H_(2)S emission and improved ionic conductivity retention after relative humidity 1.2%-1.5%ambient condition exposure.Furthermore,BN can partially react with lithium metal to create stable Li_(3)N,resulting in BN@LPSC1.3 showing reduced reactivity against lithium metal and a higher critical current density of 2.2mA/cm^(2).The Li/BN@LPSC/Li symmetrical battery also shows considerably greater stability for>2000 h at a current density of 0.1mA/cm^(2).Despite the high cathode mass loading of 13.38mg/cm^(2),the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/BN@LPSC1.3/Li all-solidstate lithium metal battery achieves 84.34%capacity retention even after 500 cycles at 0.1 C and room temperature(25℃).
文摘Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity of B4C coating were manufactured by plasma spray. It was lamellar packing and dense. The B4C coating examined here contained two principal structures and two impurity phase besides major phase. The relatively small value of Young's modulus, comparing with that of the bulk materials, is explained by porosity . The Fe impurity phase could account for the relatively high electrical conductivity of boron carbide coating by comparing with the general boron carbide materials.
基金funded by Shaanxi Provincial Key Research and Development Program of China(Grant No.2021ZDLGY11)partially supported by NSAF Project of China(Grant No.U2030202)。
文摘Boron has high mass and volume calorific values,but it is difficult to ignite and has low combustion efficiency.This literature review summarizes the strategies that are used to solve the above-mentioned problems,which include coatings of boron by using fluoride compounds,energetic composites,metal fuels,and metal oxides.Coating techniques include recrystallization,dual-solvent,phase transfer,electrospinning,etc.As one of the effective coating agents,the fluorine compounds can react with the oxide shell of boron powder.In comparison,the energetic composites can effectively improve the flame temperature of boron powder and enhance the evaporation efficiency of oxide film as a condensed product.Metals and metal oxides would react with boron powder to form metal borides with a lower ignition point,which could reduce its ignition temperature.
基金This work was supported by the Natural Science Foundation for Excellent Young Scholars of Hunan Province(No.2021JJ20048).
文摘Efficient and environmentally friendly production of high-quality continuous fiber coatings using current preparation methods is highly challenging due to issues such as scale and batch processing restrictions,low deposition rate,high energy consumption,and utilization of multiple environmentally hazardous steps.To address these challenges,we propose a stable and efficient wet chemical deposition coating method for high-throughput online continuous preparation of boron nitride(BN)coatings on ceramic fibers under an ambient environment.Our process involves surface modification,in-situ wet chemical deposition,and heat treatment,and all seamlessly connecting with the ceramic fiber preparation process through continuous stretching.Hydrophilic groups were introduced via surface modification enhancing wettability of the fiber surface with impregnating solution.An in-situ reaction and atom migration improve uniformity and binding of the coating.As a result,outstanding impregnation and adhesion properties are achieved.A comprehensive analysis to evaluate the impact of the BN coatings was conducted,which demonstrates that the BN-coated fibers exhibit a remarkable 36%increase in tensile strength,a 133%increase in fracture toughness,and enhanced temperature resistance of up to 1600℃.It provides a secure and efficient platform for cost-effective production of functional and high-quality coatings through targeted surface modification and rapid stretching impregnation.
基金Supported by National Natural Science Foundation of China(11205173)State Key Laboratory of Particle Detection and Electronics(H9294206TD)
文摘THGEMs based on a ceramic substrate have been successfully developed for neutron and single photon detection. The influences on thermal neutron scattering and internal radioactivity of both ceramic and FR-4 substrates were studied and compared. The ceramic THGEMs are homemade, of 200 μm hole diameter, 600 μm pitch,200 μm thickness, 80 μm rim, and 50 mm×50 mm sensitive area. FR-4 THGEMs with the same geometry were used as a reference. The gas gain, energy resolution and gain stability were measured in different gas mixtures using5.9 ke V X-rays. The maximum gain of a single layer ceramic THGEM reaches 6×104and 1.5×104at Ne＋CH4=95：5and Ar ＋ i-C4 H10 = 97：3, respectively. The energy resolution is better than 24%. Good gain stability was obtained during a more than 100 hour continuous test in Ar＋CO2=80：20. By using a239 Pu source, the alpha deposited energy spectrum and gain curve of the ceramic THGEM were measured.
