Owing to the low cost and high theoretical energy density,lithium-sulfur battery has become one of the most promising energy storage battery systems.However,the inherent cycle instability and safety problems of tradit...Owing to the low cost and high theoretical energy density,lithium-sulfur battery has become one of the most promising energy storage battery systems.However,the inherent cycle instability and safety problems of traditional liquid lithium-sulfur batteries greatly limit their commercial applications.In this work,polytetrafluoroethylene(PTFE)membrane was introduced into Li_(7)La_(3)Zr_(2)O_(12)(LLZO)@poly(ethylene oxide)(PEO)-based composite electrolyte as a supporting framework to prepare a new PTFE@LLZO@PEO composite electrolyte for lithium-sulfur battery.The introduction of PTFE membrane further improved the mechanical properties and thermal stability of the electrolyte.The ionic conductivity of the prepared PTFE@LLZO@PEO solid electrolyte was5.03×10^(-5)S·cm^(-1)at 30℃and 2.54×10^(-4)S·cm^(-1)at60℃.Moreover,the symmetric battery exhibited high cycle stability(300 h).The Li-S battery based on PTFE@LLZO@PEO electrolyte exhibited excellent electrochemical performance.展开更多
Zn_(2)SnO_(4)plates,particles and spheres are suc-cessfully prepared via a facile synthesis way by carefully adjusting the solvothermal conditions,which are further applied as photoanodes in dye-sensitized solar cells...Zn_(2)SnO_(4)plates,particles and spheres are suc-cessfully prepared via a facile synthesis way by carefully adjusting the solvothermal conditions,which are further applied as photoanodes in dye-sensitized solar cells(DSSCs)to explore the relationships between the pho-toanode nanostructure and the photovoltaic performances.As a result,the DSSCs based on Zn_(2)SnO_(4)spheres pho-toanode showcased the best power conversion efficiency(PCE,4.85%),compared to Zn_(2)SnO_(4)plates(3.80%)and particles(4.13%).It is found that Zn_(2)SnO_(4)spheres exhibit the highest light-scattering abilities,as evidenced by ultraviolet–visible(UV–Vis)diffuse reflectance spectra.Additionally,investigations on dynamic electron transport and recombination properties via intensity-modulated photovoltage/photocurrent spectroscopy(IMVS/IMPS),and electrochemical impedance spectroscopy(EIS)mea-surements demonstrate that the Zn_(2)SnO_(4)spheres-based DSSCs possess the fastest electron transport rate,the longest electron lifetime,the highest electron collection efficiency(ηc c),and the largest charge recombination resistance,compared with the Zn_(2)SnO_(4)plates and particles,all of which are highly beneficial for the powder conversion efficiency enhancements.展开更多
Lithium-sulfur batteries(LSBs)are one of the most promising energy storage devices in the future due to their high theoretical specific capacity(1675 mA·h·g^(-1))and energy density(2600 W·h·kg^(-1)...Lithium-sulfur batteries(LSBs)are one of the most promising energy storage devices in the future due to their high theoretical specific capacity(1675 mA·h·g^(-1))and energy density(2600 W·h·kg^(-1)).However,the severe capacity decay caused by the shuttle effect of polysulfides needs to be addressed before the practical application.Metal-organic frameworks(MOFs)and their derivatives are known for their large specific surface area,high porosity,abundant functional groups,and good chemical stability.Thus,they have been widely investigated in LSBs.This review introduces the principles of the LSBs and origination of the shuttle effect first summarizes various methods of limiting polysulfide diffusion by MOFs and their derivatives both in cathodes and separators,and provides an in-depth discussion of the immobilization mechanisms,which helps to understand the advantages and disadvantages of each method.The mechanisms,such as structure and pore size tuning,chemical absorption,and catalytic conversion,are discussed.Finally,based on the method of MOFs and their derivatives to inhibit the diffusion of polysulfides,the application prospect of MOFs and their derivatives in LSBs technology are proposed.展开更多
基金financially supported by the Talents Project of Beijing Municipal Committee Organization Department (No.2018000021223ZK21)the Fundamental Research Funds for the Central Universities (No.2021JCCXJD01)+1 种基金Key R&D and Transformation Projects in Qinghai Province (No.2021-HZ-808) and Hebei Province (No.21314401D)Open Funds of Chongqing Key Laboratory of Green Aviation Energy and Power (No. GATRI2021F01003B)
文摘Owing to the low cost and high theoretical energy density,lithium-sulfur battery has become one of the most promising energy storage battery systems.However,the inherent cycle instability and safety problems of traditional liquid lithium-sulfur batteries greatly limit their commercial applications.In this work,polytetrafluoroethylene(PTFE)membrane was introduced into Li_(7)La_(3)Zr_(2)O_(12)(LLZO)@poly(ethylene oxide)(PEO)-based composite electrolyte as a supporting framework to prepare a new PTFE@LLZO@PEO composite electrolyte for lithium-sulfur battery.The introduction of PTFE membrane further improved the mechanical properties and thermal stability of the electrolyte.The ionic conductivity of the prepared PTFE@LLZO@PEO solid electrolyte was5.03×10^(-5)S·cm^(-1)at 30℃and 2.54×10^(-4)S·cm^(-1)at60℃.Moreover,the symmetric battery exhibited high cycle stability(300 h).The Li-S battery based on PTFE@LLZO@PEO electrolyte exhibited excellent electrochemical performance.
基金financially supported by the Application Development Foundation of Guangzhou Lu Chao Science and Technology Company (No. 53H19044)the National Natural Science Foundation of China (No. U20A20238)+1 种基金the Talents Project of Beijing Municipal Committee Organization Department (No. 2018000021223ZK21)the Key Research & Development and Transformation Projects in Qinghai Province (No. 2021-HZ-808)。
文摘Zn_(2)SnO_(4)plates,particles and spheres are suc-cessfully prepared via a facile synthesis way by carefully adjusting the solvothermal conditions,which are further applied as photoanodes in dye-sensitized solar cells(DSSCs)to explore the relationships between the pho-toanode nanostructure and the photovoltaic performances.As a result,the DSSCs based on Zn_(2)SnO_(4)spheres pho-toanode showcased the best power conversion efficiency(PCE,4.85%),compared to Zn_(2)SnO_(4)plates(3.80%)and particles(4.13%).It is found that Zn_(2)SnO_(4)spheres exhibit the highest light-scattering abilities,as evidenced by ultraviolet–visible(UV–Vis)diffuse reflectance spectra.Additionally,investigations on dynamic electron transport and recombination properties via intensity-modulated photovoltage/photocurrent spectroscopy(IMVS/IMPS),and electrochemical impedance spectroscopy(EIS)mea-surements demonstrate that the Zn_(2)SnO_(4)spheres-based DSSCs possess the fastest electron transport rate,the longest electron lifetime,the highest electron collection efficiency(ηc c),and the largest charge recombination resistance,compared with the Zn_(2)SnO_(4)plates and particles,all of which are highly beneficial for the powder conversion efficiency enhancements.
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.52272258)the Fundamental Research Funds for the Central Universities(Grant No.2021JCCXJD01)+2 种基金Key R&D and transformation projects in Qinghai Province(Grant No.2021-HZ-808)Hebei Province(Grant No.21314401D)American Chemical Society Petroleum Research Fund(Grant No.PRF-59722-ND10).
文摘Lithium-sulfur batteries(LSBs)are one of the most promising energy storage devices in the future due to their high theoretical specific capacity(1675 mA·h·g^(-1))and energy density(2600 W·h·kg^(-1)).However,the severe capacity decay caused by the shuttle effect of polysulfides needs to be addressed before the practical application.Metal-organic frameworks(MOFs)and their derivatives are known for their large specific surface area,high porosity,abundant functional groups,and good chemical stability.Thus,they have been widely investigated in LSBs.This review introduces the principles of the LSBs and origination of the shuttle effect first summarizes various methods of limiting polysulfide diffusion by MOFs and their derivatives both in cathodes and separators,and provides an in-depth discussion of the immobilization mechanisms,which helps to understand the advantages and disadvantages of each method.The mechanisms,such as structure and pore size tuning,chemical absorption,and catalytic conversion,are discussed.Finally,based on the method of MOFs and their derivatives to inhibit the diffusion of polysulfides,the application prospect of MOFs and their derivatives in LSBs technology are proposed.
