The main challenges in development of traditional liquid lithium-sulfur batteries are the shuttle effect at the cathode caused by the polysulfide and the safety concern at the Li metal anode arose from the dendrite fo...The main challenges in development of traditional liquid lithium-sulfur batteries are the shuttle effect at the cathode caused by the polysulfide and the safety concern at the Li metal anode arose from the dendrite formation.All-solid-state lithium-sulfur batteries have been proposed to solve the shuttle effect and prevent short circuits.However,solid-solid contacts between the electrodes and the electrolyte increase the interface resistance and stress/strain,which could result in the limited electrochemical performances.In this work,the cathode of all-solid-state lithium-sulfur batteries is prepared by depositing sulfur on the surface of the carbon nanotubes(CNTs@S)and further mixing with Li10GeP2S12 electrolyte and acetylene black agents.At 60℃,CNTs@S electrode exhibits superior electrochemical performance,delivering the reversible discharge capacities of 1193.3,959.5,813.1,569.6 and 395.5 mAhg^-1 at the rate of 0.1,0.5,1,2 and 5 C,respectively.Moreover,the CNTs@S is able to demonstrate superior high-rate capability of 660.3 mAhg^-1 and cycling stability of 400 cycles at a high rate of 1.0 C.Such uniform distribution of the CNTs,S and Li10GeP2S12 electrolyte increase the electronic and ionic conductivity between the cathode and the electrolyte hence improves the rate performance and capacity retention.展开更多
Secondary lithium-sulfur batteries have attracted extensive attention due to their high energy density,low cost and environment friendly.However,the"shuttle effect"of polysulfides dissolved in liquid electro...Secondary lithium-sulfur batteries have attracted extensive attention due to their high energy density,low cost and environment friendly.However,the"shuttle effect"of polysulfides dissolved in liquid electrolytes leads to a decrease of the cell Coulomb efficiency(CE).Therefore,researchers have used solid electrolytes instead of traditional liquid electrolytes and separators to suppress the"shuttle effect"of polysulfides and the growth of lithium dendrites.The progress in electrolytes for solid-state lithium-sulfur batteries including solid-state polymer,inorganic,and composite electrolytes to solve the issues is summarized.展开更多
利用高温管式炉对电站锅炉水冷壁受热面常用的两种管材(12Cr1Mo VG和15Cr Mo G)开展高温腐蚀实验研究,采用腐蚀增重法,得出气相硫、气固相硫作用下试片的腐蚀动力学曲线,并利用SEM和EDS对腐蚀试片表面及断面的微观形貌和元素成分进行分...利用高温管式炉对电站锅炉水冷壁受热面常用的两种管材(12Cr1Mo VG和15Cr Mo G)开展高温腐蚀实验研究,采用腐蚀增重法,得出气相硫、气固相硫作用下试片的腐蚀动力学曲线,并利用SEM和EDS对腐蚀试片表面及断面的微观形貌和元素成分进行分析。结果表明:两种材料的腐蚀动力学曲线都满足双对数曲线规律,气固相硫协同作用对金属的腐蚀性强于单因素气相硫的影响,15Cr Mo G的抗腐蚀性能优于12Cr1Mo VG;腐蚀层大致可以分为3层,依次为剥离叶片层、过渡层和腐蚀渗透层,气相硫腐蚀下腐蚀层较厚并且质地紧密,气相硫与固相硫协同腐蚀下腐蚀层较薄并且质地疏松,极易剥落;此外腐蚀层中存在硫元素富集现象,腐蚀渗透层中的硫元素质量分数高达6.65%,并且氧元素含量从金属基体表面到腐蚀层表面呈现递增规律。展开更多
基金supported by the National Key R&D Program of China (Grant no. 2016YFB0100105)the National Natural Science Foundation of China (Grant no. 51872303)+1 种基金Zhejiang Provincial Natural Science Foundation of China (Grant no. LD18E020004, LQ16E020003, LY18E020018, LY18E030011)Youth Innovation Promotion Association CAS (2017342)
文摘The main challenges in development of traditional liquid lithium-sulfur batteries are the shuttle effect at the cathode caused by the polysulfide and the safety concern at the Li metal anode arose from the dendrite formation.All-solid-state lithium-sulfur batteries have been proposed to solve the shuttle effect and prevent short circuits.However,solid-solid contacts between the electrodes and the electrolyte increase the interface resistance and stress/strain,which could result in the limited electrochemical performances.In this work,the cathode of all-solid-state lithium-sulfur batteries is prepared by depositing sulfur on the surface of the carbon nanotubes(CNTs@S)and further mixing with Li10GeP2S12 electrolyte and acetylene black agents.At 60℃,CNTs@S electrode exhibits superior electrochemical performance,delivering the reversible discharge capacities of 1193.3,959.5,813.1,569.6 and 395.5 mAhg^-1 at the rate of 0.1,0.5,1,2 and 5 C,respectively.Moreover,the CNTs@S is able to demonstrate superior high-rate capability of 660.3 mAhg^-1 and cycling stability of 400 cycles at a high rate of 1.0 C.Such uniform distribution of the CNTs,S and Li10GeP2S12 electrolyte increase the electronic and ionic conductivity between the cathode and the electrolyte hence improves the rate performance and capacity retention.
基金financially supported by the National Natural Science Foundation of China (Nos.21333007, U1705255,21373137)New Century Excellent Talents in University(No.NCET-13-0371)
文摘Secondary lithium-sulfur batteries have attracted extensive attention due to their high energy density,low cost and environment friendly.However,the"shuttle effect"of polysulfides dissolved in liquid electrolytes leads to a decrease of the cell Coulomb efficiency(CE).Therefore,researchers have used solid electrolytes instead of traditional liquid electrolytes and separators to suppress the"shuttle effect"of polysulfides and the growth of lithium dendrites.The progress in electrolytes for solid-state lithium-sulfur batteries including solid-state polymer,inorganic,and composite electrolytes to solve the issues is summarized.
文摘利用高温管式炉对电站锅炉水冷壁受热面常用的两种管材(12Cr1Mo VG和15Cr Mo G)开展高温腐蚀实验研究,采用腐蚀增重法,得出气相硫、气固相硫作用下试片的腐蚀动力学曲线,并利用SEM和EDS对腐蚀试片表面及断面的微观形貌和元素成分进行分析。结果表明:两种材料的腐蚀动力学曲线都满足双对数曲线规律,气固相硫协同作用对金属的腐蚀性强于单因素气相硫的影响,15Cr Mo G的抗腐蚀性能优于12Cr1Mo VG;腐蚀层大致可以分为3层,依次为剥离叶片层、过渡层和腐蚀渗透层,气相硫腐蚀下腐蚀层较厚并且质地紧密,气相硫与固相硫协同腐蚀下腐蚀层较薄并且质地疏松,极易剥落;此外腐蚀层中存在硫元素富集现象,腐蚀渗透层中的硫元素质量分数高达6.65%,并且氧元素含量从金属基体表面到腐蚀层表面呈现递增规律。
