首页|Rational design of Prussian blue analogues as conversion anodes for lithium-ion batteries with high capacity and long cycle life
Rational design of Prussian blue analogues as conversion anodes for lithium-ion batteries with high capacity and long cycle life
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NSTL
Elsevier
Prussian blue analogues (PBAs) have garnered much attentions in energy fields due to their three-dimensional open framework and electrochemical tunability. Noticeably, PBAs are also deemed extremely attractive as anode materials for batteries by virtue of their abundant internal active sites. However, their unclear redox mechanisms at lower potential severely restricts PBAs anodes to realize stable cycling performances. In this work, low-cost KxMn[Fe(CN)6]y□1?y·nH2O with diverse H2O content and structure are harvested via controlling the crystallization rate. It is firstly discovered that the KxMn[Fe(CN)6]y anodes undergoes multi-electron conversion reactions involving the fracture and recombination of Mn[sbnd]N bonds, while the stronger Fe[sbnd]C bond is preserved. Then, it is confirmed that weaker Mn[sbnd]N bond which need to be prepared at a faster crystallization rate is more conducive to the fast electrochemical kinetics of the reversible conversion paths. Accordingly, the K0.09Mn[Fe(CN)6]0.66□0.34·3.40 H2O with higher H2O content and weaker Mn[sbnd]N bond achieve the best Li-storage performances, exhibiting a reversible capacity of 480 mAh g?1 at a high current density of 1 A g?1 and considerable cycling stability exceeding 1000 cycles. The results also suggest that interstitial H2O could be beneficial for the better cycling stability of the KxMn[Fe(CN)6]y anodes. This work can provide new insights for the rational design of novel conversion anodes with high reversible capacity and superior cycling stability.
Conversion anodeHigher H2O contentLithium-ion batteriesPrussian blue analoguesWeaker bond energy
Tang Y.、Li H.、Zhou M.、Wang K.、Jiang K.、Li Y.、Hu J.、Tao H.、Li W.
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State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology
State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology
State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology
NSTL
Elsevier
