All-solid-state Li metal batteries(ASSLBs)using inorganic solid electrolyte(SE)are considered promising alternatives to conventional Li-ion batteries,offering improved safety and boosted energy density.While significa...All-solid-state Li metal batteries(ASSLBs)using inorganic solid electrolyte(SE)are considered promising alternatives to conventional Li-ion batteries,offering improved safety and boosted energy density.While significant progress has been made on improving the ionic conductivity of SEs,the degradation and instability of Li metal/inorganic SE interfaces have become the critical challenges that limit the coulombic efficiency,power performance,and cycling stability of ASSLBs.Understanding the mechanisms of complex/dynamic interfacial phenomena is of great importance in addressing these issues.Herein,recent studies on identifying,understanding,and solving interfacial issues on anode side in ASSLBs are comprehensively reviewed.Typical issues at Li metal/SE interface include Li dendrite growth/propagation,SE cracking,physical contact loss,and electrochemical reactions,which lead to high interfacial resistance and cell failure.The causes of these issues relating to the chemical,physical,and mechanical properties of Li metal and SEs are systematically discussed.Furthermore,effective mitigating strategies are summarized and their effects on suppressing interfacial reactions,improving interfacial Li-ion transport,maintaining interfacial contact,and stabilizing Li plating/stripping are highlighted.The in-depth mechanistic understanding of interfacial issues and complete investigations on current solutions provide foundations and guidance for future research and development to realize practical application of high-performance ASSLB.展开更多
Ru-doped NiAlHf coatings were deposited on Ni-based single crystal substrate by arc ion plating technology.The failure mechanism and interfacial diffusion behavior were comparatively investigated with NiAlHf coating u...Ru-doped NiAlHf coatings were deposited on Ni-based single crystal substrate by arc ion plating technology.The failure mechanism and interfacial diffusion behavior were comparatively investigated with NiAlHf coating using scanning electron microscopy,electron probe micro-analyzer,and transmission electron microscopy.The results indicated that microstructure evolution of oxide scale induced by element diffusion process significantly affected oxidation resistance of NiAlHf/Ru coatings,resulting in formation of cracks and voids,thereby accelerating failure process.The precipitates in interdiffusion zone and secondary reaction zone of the substrate initiated by interfacial element diffusion were P phase andσphase,respectively.And the discrepancy in content was elucidated from the perspective of thermodynamics and kinetics.Besides,microstructural evolution between NiAlHf/Ru coatings and substrate was also deliberated.The research could not only provide profound understanding of NiAlHf/Ru coatings failure mechanism,but also had significant guidance for suppressing precipitation of topological close-packed phases and facilitating development of single crystal Ni-based superalloys.展开更多
Among various energy storage devices,lithium-sulfur batteries have attracted widespread attention due to their high theoretical energy density and specific capacity.To improve the performance and realize practical app...Among various energy storage devices,lithium-sulfur batteries have attracted widespread attention due to their high theoretical energy density and specific capacity.To improve the performance and realize practical applications of lithium-sulfur batteries,it is crucial to unravel the dynamic evolution and reaction mechanism at the electrode/electrolyte interfaces during cycling.Nevertheless,the details are still not well known despite generous efforts,which need more in situ and non-destructive imaging characterizations.Herein,we have combined AFM with an electrochemical workstation to dynamically visualize the morphological evolution and structural changes of the interfacial process,which reveals the lithium iodide-mediated interfacial reactions in lithium-sulfur batteries.In situ measurements showed that the electrode surface was coated by a reticular layer consists of elemental iodine and polyether with lithium iodide additive during charging,which could effectively prevent insolube sulfides from gathering on the surface and improve the cycling performances of lithium-sulfur batteries.These findings shed new light on the interfacial mechanism and establish design ideas for the future development of better electrolytes for lithium-sulfur batteries.展开更多
基金supported by the Outstanding Youth Fund Project by the Department of Science and Technology of Jiangsu Province(Grant No.BK20220045)the Key R&D Project funded by the Department of Science and Technology of Jiangsu Province(Grant No.BE2020003)+6 种基金Key Program-Automobile Joint Fund of National Natural Science Foundation of China(Grant No.U1964205)General Program of National Natural Science Foundation of China(Grant No.51972334)General Program of National Natural Science Foundation of Beijing(Grant No.2202058)Cultivation project of leading innovative experts in Changzhou City(CQ20210003)National Overseas High-level Expert recruitment Program(Grant No.E1JF021E11)Talent Program of Chinese Academy of Sciences,“Scientist Studio Program Funding”from Yangtze River Delta Physics Research Center,and Tianmu Lake Institute of Advanced Energy Storage Technologies(Grant No.TIESSS0001)Science and Technology Research Institute of China Three Gorges Corporation(Grant No.202103402)
文摘All-solid-state Li metal batteries(ASSLBs)using inorganic solid electrolyte(SE)are considered promising alternatives to conventional Li-ion batteries,offering improved safety and boosted energy density.While significant progress has been made on improving the ionic conductivity of SEs,the degradation and instability of Li metal/inorganic SE interfaces have become the critical challenges that limit the coulombic efficiency,power performance,and cycling stability of ASSLBs.Understanding the mechanisms of complex/dynamic interfacial phenomena is of great importance in addressing these issues.Herein,recent studies on identifying,understanding,and solving interfacial issues on anode side in ASSLBs are comprehensively reviewed.Typical issues at Li metal/SE interface include Li dendrite growth/propagation,SE cracking,physical contact loss,and electrochemical reactions,which lead to high interfacial resistance and cell failure.The causes of these issues relating to the chemical,physical,and mechanical properties of Li metal and SEs are systematically discussed.Furthermore,effective mitigating strategies are summarized and their effects on suppressing interfacial reactions,improving interfacial Li-ion transport,maintaining interfacial contact,and stabilizing Li plating/stripping are highlighted.The in-depth mechanistic understanding of interfacial issues and complete investigations on current solutions provide foundations and guidance for future research and development to realize practical application of high-performance ASSLB.
基金This work was supported by Guangdong Special Support Program(No.2019BT02C629)GDAS0 Project of Science Technology Development(No.2020GDASYL-20200402005)+1 种基金The Scientific Research Fund of Guangdong Province,China(No.2016A030312015)Doctoral Research Initiation Program(No.84KZ-KZ08072).
文摘Ru-doped NiAlHf coatings were deposited on Ni-based single crystal substrate by arc ion plating technology.The failure mechanism and interfacial diffusion behavior were comparatively investigated with NiAlHf coating using scanning electron microscopy,electron probe micro-analyzer,and transmission electron microscopy.The results indicated that microstructure evolution of oxide scale induced by element diffusion process significantly affected oxidation resistance of NiAlHf/Ru coatings,resulting in formation of cracks and voids,thereby accelerating failure process.The precipitates in interdiffusion zone and secondary reaction zone of the substrate initiated by interfacial element diffusion were P phase andσphase,respectively.And the discrepancy in content was elucidated from the perspective of thermodynamics and kinetics.Besides,microstructural evolution between NiAlHf/Ru coatings and substrate was also deliberated.The research could not only provide profound understanding of NiAlHf/Ru coatings failure mechanism,but also had significant guidance for suppressing precipitation of topological close-packed phases and facilitating development of single crystal Ni-based superalloys.
基金financially supported by the National Key Research and Development Program of China(Grant No.2021YFB2500300)CAS Project for Young Scientists in Basic Research(Grant No.YSBR-058)the National Nature Science Fund for Excellent Young Scholars(Grant No.21722508).
文摘Among various energy storage devices,lithium-sulfur batteries have attracted widespread attention due to their high theoretical energy density and specific capacity.To improve the performance and realize practical applications of lithium-sulfur batteries,it is crucial to unravel the dynamic evolution and reaction mechanism at the electrode/electrolyte interfaces during cycling.Nevertheless,the details are still not well known despite generous efforts,which need more in situ and non-destructive imaging characterizations.Herein,we have combined AFM with an electrochemical workstation to dynamically visualize the morphological evolution and structural changes of the interfacial process,which reveals the lithium iodide-mediated interfacial reactions in lithium-sulfur batteries.In situ measurements showed that the electrode surface was coated by a reticular layer consists of elemental iodine and polyether with lithium iodide additive during charging,which could effectively prevent insolube sulfides from gathering on the surface and improve the cycling performances of lithium-sulfur batteries.These findings shed new light on the interfacial mechanism and establish design ideas for the future development of better electrolytes for lithium-sulfur batteries.
