The uneven deposition of lithium(Li) on current collectors causes serious dendrite growth and volume expansion. Commercial foamed copper(Cu) current collectors are unsuitable for Li anodes because of their large volum...The uneven deposition of lithium(Li) on current collectors causes serious dendrite growth and volume expansion. Commercial foamed copper(Cu) current collectors are unsuitable for Li anodes because of their large volume and mass and lithiophobic nature. Herein, a three-dimensional(3 D) copper@tin(Cu@Sn) nanocone current collector with small volume, light weight, and lithiophilic nature was prepared by a simple electrodeposition method. The synergy of the nanoconical structure and lithiophilic Sn promotes the even deposition of Li and effectively inhibits the formation of Li dendrites. The resultant half batteries exhibit high Coulombic efficiency of 97.6% after 100 cycles at 1 mA cm^(-2), and the symmetrical Li battery demonstrates a prolonged lifespan of over 600 h at 1 mA cm^(-2). The full battery based on organic liquid electrolyte with LiFePO_(4) also exhibits a long lifespan of 550 cycles with high capacity retention of 95.1% at 1 C.Moreover, 3 D Cu@Sn nanocone-based solid-state batteries exhibit excellent electrochemical performance and show no decay after 500 cycles at 1 C. Our work provides a strategy for fabricating 3 D current collectors for high-energy-density Li metal batteries.展开更多
To optimize the comprehensive properties of Ni−Si precipitation strengthened phosphor bronze,the impact of the Ni/Si mass ratio and heat treatment process on a Cu−8Sn−0.1P−1Ni−xSi alloy was explored.High resolution fi...To optimize the comprehensive properties of Ni−Si precipitation strengthened phosphor bronze,the impact of the Ni/Si mass ratio and heat treatment process on a Cu−8Sn−0.1P−1Ni−xSi alloy was explored.High resolution field emission scanning electron microscopy and transmission electron microscopy were used for microstructural characterization.The results indicate that the properties are influenced by the Ni/Si mass ratio,attributed to the formation of various second phases.Simultaneously,by influencing the diffusion rate,the microstructures and properties are influenced by the solid solution treatment.The strength is enhanced by precipitated nanoscale particles during the aging process by influencing the motion of dislocations.Ultimately,excellent comprehensive properties,including ultimate tensile strength,yield strength,and elongation of 866 MPa,772 MPa,and 8.7%,respectively,are obtained in the Cu−8Sn−0.1P−1Ni−0.227Si alloy.展开更多
基金supported by the National Natural Science Foundation of China (51771094 and 21835004)the National Key R&D Program of China (2016YFB0901500)+1 种基金the Ministry of Education of China (B12015 and IRT13R30)Tianjin Natural Science Foundation (18JCZDJC31500)。
文摘The uneven deposition of lithium(Li) on current collectors causes serious dendrite growth and volume expansion. Commercial foamed copper(Cu) current collectors are unsuitable for Li anodes because of their large volume and mass and lithiophobic nature. Herein, a three-dimensional(3 D) copper@tin(Cu@Sn) nanocone current collector with small volume, light weight, and lithiophilic nature was prepared by a simple electrodeposition method. The synergy of the nanoconical structure and lithiophilic Sn promotes the even deposition of Li and effectively inhibits the formation of Li dendrites. The resultant half batteries exhibit high Coulombic efficiency of 97.6% after 100 cycles at 1 mA cm^(-2), and the symmetrical Li battery demonstrates a prolonged lifespan of over 600 h at 1 mA cm^(-2). The full battery based on organic liquid electrolyte with LiFePO_(4) also exhibits a long lifespan of 550 cycles with high capacity retention of 95.1% at 1 C.Moreover, 3 D Cu@Sn nanocone-based solid-state batteries exhibit excellent electrochemical performance and show no decay after 500 cycles at 1 C. Our work provides a strategy for fabricating 3 D current collectors for high-energy-density Li metal batteries.
基金the support of the National Key Research and Development Program of China(No.2018YFE0306103)the National Natural Science Foundation of China(No.52071050)the Science and Technology Innovation Project of Ningbo,China(No.2021Z032).
文摘To optimize the comprehensive properties of Ni−Si precipitation strengthened phosphor bronze,the impact of the Ni/Si mass ratio and heat treatment process on a Cu−8Sn−0.1P−1Ni−xSi alloy was explored.High resolution field emission scanning electron microscopy and transmission electron microscopy were used for microstructural characterization.The results indicate that the properties are influenced by the Ni/Si mass ratio,attributed to the formation of various second phases.Simultaneously,by influencing the diffusion rate,the microstructures and properties are influenced by the solid solution treatment.The strength is enhanced by precipitated nanoscale particles during the aging process by influencing the motion of dislocations.Ultimately,excellent comprehensive properties,including ultimate tensile strength,yield strength,and elongation of 866 MPa,772 MPa,and 8.7%,respectively,are obtained in the Cu−8Sn−0.1P−1Ni−0.227Si alloy.
