The efficient utilization of metallic lithium(Li)is the key to enable application of Li metal full-cell with low amount of excess Li,contributing to higher safety and energy density.Herein,we report an extraordinary L...The efficient utilization of metallic lithium(Li)is the key to enable application of Li metal full-cell with low amount of excess Li,contributing to higher safety and energy density.Herein,we report an extraordinary Li metal full-cell with only 20%excess Li,which demonstrated significantly improved reversibility and high Coulombic efficiency.Ingenious simulated missile guidance and confinement system(SMGCS)was designed to guide and confine Li deposition through constructing compatible silver lithiophilic sites and nitrate layer.Silver sites act as effective Li nuclei to attract Li ions and direct the initial nucleation.The generated nitrate layer affords an interfacial environment favorable for confined and uniform deep Li deposition,which is theoretically verified by molecular dynamics(MD)simulations.The two combined merits offer a robust and dendrite-free Li deposition,enabling the application of Li metal full-cell with slight excess Li.They also result in an outperformed Li cycling efficiency of ca.99%for over 300 cycles along with deep cycling at a high capacity of 10 mA h cm^(-2)in carbonate electrolytes.The unprecedented high degree of Li utilization opens a new avenue for the future development of highly efficient Li metal full-cells.展开更多
Alumina coatings doped with different precious metals were prepared by cathode plasma electrolytic deposition.Results show that the porosity of precious metal-doped alumina coatings(especially Al_(2)O_(3)-Ru)decreases...Alumina coatings doped with different precious metals were prepared by cathode plasma electrolytic deposition.Results show that the porosity of precious metal-doped alumina coatings(especially Al_(2)O_(3)-Ru)decreases,and the high-temperature cyclic oxidation resistance and spallation resistance are enhanced.The Al_(2)O_(3)-Ru composite coating shows better effect:its average oxidation rate K and average amount of oxide spallation G are minimum.Meanwhile,Nernst equation was used to explain the simultaneous deposition of precious metal and alumina,and the whole process and mechanism of deposition were analyzed.展开更多
基金the National Natural Science Foundation of China(51622208,21703149,and 51872193)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘The efficient utilization of metallic lithium(Li)is the key to enable application of Li metal full-cell with low amount of excess Li,contributing to higher safety and energy density.Herein,we report an extraordinary Li metal full-cell with only 20%excess Li,which demonstrated significantly improved reversibility and high Coulombic efficiency.Ingenious simulated missile guidance and confinement system(SMGCS)was designed to guide and confine Li deposition through constructing compatible silver lithiophilic sites and nitrate layer.Silver sites act as effective Li nuclei to attract Li ions and direct the initial nucleation.The generated nitrate layer affords an interfacial environment favorable for confined and uniform deep Li deposition,which is theoretically verified by molecular dynamics(MD)simulations.The two combined merits offer a robust and dendrite-free Li deposition,enabling the application of Li metal full-cell with slight excess Li.They also result in an outperformed Li cycling efficiency of ca.99%for over 300 cycles along with deep cycling at a high capacity of 10 mA h cm^(-2)in carbonate electrolytes.The unprecedented high degree of Li utilization opens a new avenue for the future development of highly efficient Li metal full-cells.
基金Shaanxi Province Key Research and Development Plan(2024GX-YBXM-368)。
文摘Alumina coatings doped with different precious metals were prepared by cathode plasma electrolytic deposition.Results show that the porosity of precious metal-doped alumina coatings(especially Al_(2)O_(3)-Ru)decreases,and the high-temperature cyclic oxidation resistance and spallation resistance are enhanced.The Al_(2)O_(3)-Ru composite coating shows better effect:its average oxidation rate K and average amount of oxide spallation G are minimum.Meanwhile,Nernst equation was used to explain the simultaneous deposition of precious metal and alumina,and the whole process and mechanism of deposition were analyzed.
