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Enhanced performance of core-shell structured sodium manganese hexacyanoferrate achieved by self-limiting Na^(+)-Cs^(+)ion exchange for sodium-ion batteries 被引量:1
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作者 Yan-Dong Guo ji-cheng jiang +4 位作者 Jian Xie Xin Wang Jing-Ze Li Dong-Huang Wang Ai-Jun Zhou 《Rare Metals》 SCIE EI CAS CSCD 2022年第11期3740-3751,共12页
Sodium manganese hexacyanoferrate(NaMnHCF)is a promising cathode material for sodiumion batteries(SIBs)due to its low cost and high energy density.The Jahn-Teller effect of Mn,however,leads to the poor structural stab... Sodium manganese hexacyanoferrate(NaMnHCF)is a promising cathode material for sodiumion batteries(SIBs)due to its low cost and high energy density.The Jahn-Teller effect of Mn,however,leads to the poor structural stability of NaMnHCF,resulting in undesired electrochemical performance.Herein,we developed a novel coating strategy and obtained a coreshell structured NaMnHCF through facile Na^(+)-Cs^(+)ion exchange,which naturally produced a robust and insoluble Cs-rich surface layer(CsMnHCF)with several nanometers in thickness on pristine NaMnHCF.It is shown that the Csrich surface plays a positive role in the stability of the NaMnHCF structure by prohibiting the leakage of crystal water,stabilizing the solid-liquid interfaces,and solidifying crystal structure.The electrochemical performance of the core-shell NaMnHCF is dramatically improved with a discharge capacity of 76.3 mAh·g^(-1)after 1000 cycles at 1.0 C and a reversible capacity of 87.0 mAh·g^(-1)at 10.0 C,which is much superior to that of the pristine NaMnHCF with only 26.6 mAh·g^(-1)after 400 cycles and 31 mAh·g^(-1)at 10.0 C.This work reports a new method for the synthesis of core-shell NaMnHCF and provides a novel perspective for the development of advanced NaMnHCF cathode for SIBs. 展开更多
关键词 Sodium manganese hexacyanoferrate Ion-exchange Core-shell structure Surface modification Sodium-ion batteries
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