Stable sodium metal anode enhanced by advanced electrolytes with SbF3 additive
来源期刊：Rare Metals2021年第2期
论文作者：Wei Fang Rui Jiang Hao Zheng Yi Zheng Yi Sun Xin Liang Hong-Fa Xiang Yue-Zhan Feng Yan Yu
摘 要：The practical application of sodium metal batteries（SMBs） is hampered due to the inferior interfacial stability between Na metal and conventional electrolytes.Therefore,a high-concentration electrolyte is proposed to solve this issue.However,high viscosity,low ionic conductivity,and unsatisfactory wettability toward the separator need to be overcome.In this study,a localized highconcentration electrolyte（LHCE） is formulated with1 wt% SbF3 as an interface-stabilized additive to protect the Na metal anode.This reformulated LHCE retains the special coordination structure in HCE with improved wettability and high ionic conductivity.Moreover,the introduction of the SbF3 additive into the LHCE resulted in a bilayer-structured solid electrolyte interface（SEI）including a Na-Sb alloy inner layer and a NaF-rich outer layer on the Na metal.As expected,the NaIINa cells using LHCE+1 wt% SbF3 show a long cycle lifespan of over1200 h at 0.5 mA·cm-2 with negligible polarization,and NaIINa3 V2（PO4）3 cells exhibit a high capacity exceeding 97 mAh·g-1 at 40 C.
Wei Fang1，Rui Jiang1，Hao Zheng1，Yi Zheng1，Yi Sun1，Xin Liang1，Hong-Fa Xiang1，Yue-Zhan Feng2，Yan Yu3,4
1. School of Materials Science and Engineering,Engineering Research Center of High Performance Copper Alloy Materials and Processing,Ministry of Education,Hefei University of Technology2. Key Laboratory of Materials Processing and Mold, Ministry of Education,Zhengzhou University3. Hefei National Laboratory for Physical Sciences at the Microscale,Department of Materials Science and Engineering, Key Laboratory of Materials for Energy Conversion,Chinese Academy of Sciences (CAS),University of Science and Technology of China4. Dalian National Laboratory for Clean Energy(DNL),Chinese Academy of Sciences(CAS)
摘 要：The practical application of sodium metal batteries（SMBs） is hampered due to the inferior interfacial stability between Na metal and conventional electrolytes.Therefore,a high-concentration electrolyte is proposed to solve this issue.However,high viscosity,low ionic conductivity,and unsatisfactory wettability toward the separator need to be overcome.In this study,a localized highconcentration electrolyte（LHCE） is formulated with1 wt% SbF3 as an interface-stabilized additive to protect the Na metal anode.This reformulated LHCE retains the special coordination structure in HCE with improved wettability and high ionic conductivity.Moreover,the introduction of the SbF3 additive into the LHCE resulted in a bilayer-structured solid electrolyte interface（SEI）including a Na-Sb alloy inner layer and a NaF-rich outer layer on the Na metal.As expected,the NaIINa cells using LHCE+1 wt% SbF3 show a long cycle lifespan of over1200 h at 0.5 mA·cm-2 with negligible polarization,and NaIINa3 V2（PO4）3 cells exhibit a high capacity exceeding 97 mAh·g-1 at 40 C.
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