All-solid-state fluoride-ion batteries(ASSFIBs)exhibit ultrahigh theoretical energy densities up to5000 W h L,and thus receive increasing attention.However,due to the difficulty of identifying appropriate solid electr...All-solid-state fluoride-ion batteries(ASSFIBs)exhibit ultrahigh theoretical energy densities up to5000 W h L,and thus receive increasing attention.However,due to the difficulty of identifying appropriate solid electrolytes,it was commonly believed that ASSFIBs cannot exhibit satisfactory long-term cycling performance at 25℃.Recently,this situation is changed by the discovery of CsPb_(0.9)K_(0.1)F_(2.9),which shows a rare combination of high ionic conductivity and excellent electrochemical stability.Here,we discover that the performance of this material can be further improved by simply altering the reported mechanochemical synthesis approach with the solid-state reaction.The resulting material shows a room-temperature conductivity of 2.2 mS cm^(-1),outperforming the most conductive F-ion solid electrolyte reported so far(PbSnF,1.6 mS cm^(-1)).More importantly,it enables 100 cycles of stable ASSFIB operation at 25℃for the first time,with a final capacity(152.5 mA h g^(-1) after 100 cycles)also surpassing all the other room-temperature bulk-type ASSFIBs in literature(below 80 mA h g^(-1) after no more than20 cycles).展开更多
In the development of new electrochemical concepts for the fabrication of high-energy-density batteries,fluorideion batteries(FIBs)have emerged as one of the valid candidates for the next generation electrochemical en...In the development of new electrochemical concepts for the fabrication of high-energy-density batteries,fluorideion batteries(FIBs)have emerged as one of the valid candidates for the next generation electrochemical energy storage technologies,showing the potential to match or even surpass the current lithium-ion batteries(LIBs)in terms of energy density,safety without dendritic grains,and elimination of dependence on scarce lithium and cobalt resources.However,the development of FIBs is still in its infancy and their performance is far from satisfactory,with issues such as the lower fluoride-ion conductivity of the electrolytes and the reversibility of the electrodes hindering their commercialization.Previous reviews have mainly focused on inorganic solid electrolytes with a brief emphasis on the development of various fluoride-ion conductors and their ion-conducting properties.Therefore,this review summarizes the current developments in various electrolytes,a systematic overview of the current progress for various fluoride-ion electrolytes is presented by beginning with the history,structure and classification of FIBs,ion-transport mechanisms are briefly discussed.Recent advances in different classes of fluoride-ion electrolytes are described.The methods for optimizing the ionic conductivity characteristics of the fluoride-ion electrolytes are highlighted.Finally,an outlook on the future research direction of FIBs is given by highlighting some critical issues,challenges and prospects of fluoride-ion electrolytes.展开更多
基金the financial support from the National Key R&D Program of China(2018YFA0209600 and2017YFA0208300)the National Natural Science Foundation of China(51802302)+1 种基金the Fundamental Research Funds for the Central Universities(WK3430000006)the National Synchrotron Radiation Laboratory(KY2060000199)。
文摘All-solid-state fluoride-ion batteries(ASSFIBs)exhibit ultrahigh theoretical energy densities up to5000 W h L,and thus receive increasing attention.However,due to the difficulty of identifying appropriate solid electrolytes,it was commonly believed that ASSFIBs cannot exhibit satisfactory long-term cycling performance at 25℃.Recently,this situation is changed by the discovery of CsPb_(0.9)K_(0.1)F_(2.9),which shows a rare combination of high ionic conductivity and excellent electrochemical stability.Here,we discover that the performance of this material can be further improved by simply altering the reported mechanochemical synthesis approach with the solid-state reaction.The resulting material shows a room-temperature conductivity of 2.2 mS cm^(-1),outperforming the most conductive F-ion solid electrolyte reported so far(PbSnF,1.6 mS cm^(-1)).More importantly,it enables 100 cycles of stable ASSFIB operation at 25℃for the first time,with a final capacity(152.5 mA h g^(-1) after 100 cycles)also surpassing all the other room-temperature bulk-type ASSFIBs in literature(below 80 mA h g^(-1) after no more than20 cycles).
基金supported by the State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KFZD202003)the State Key Laboratory of Physical Chemistry of Solid Surfaces(No.202116)Xiamen University,and Xiamen Institute of Rare Earth Materials XMIREM autonomously deployment project(No.2023CX05).
文摘In the development of new electrochemical concepts for the fabrication of high-energy-density batteries,fluorideion batteries(FIBs)have emerged as one of the valid candidates for the next generation electrochemical energy storage technologies,showing the potential to match or even surpass the current lithium-ion batteries(LIBs)in terms of energy density,safety without dendritic grains,and elimination of dependence on scarce lithium and cobalt resources.However,the development of FIBs is still in its infancy and their performance is far from satisfactory,with issues such as the lower fluoride-ion conductivity of the electrolytes and the reversibility of the electrodes hindering their commercialization.Previous reviews have mainly focused on inorganic solid electrolytes with a brief emphasis on the development of various fluoride-ion conductors and their ion-conducting properties.Therefore,this review summarizes the current developments in various electrolytes,a systematic overview of the current progress for various fluoride-ion electrolytes is presented by beginning with the history,structure and classification of FIBs,ion-transport mechanisms are briefly discussed.Recent advances in different classes of fluoride-ion electrolytes are described.The methods for optimizing the ionic conductivity characteristics of the fluoride-ion electrolytes are highlighted.Finally,an outlook on the future research direction of FIBs is given by highlighting some critical issues,challenges and prospects of fluoride-ion electrolytes.
