Vacancy and Composition Engineering of Manganese Hexacyanoferrate for Sodium-Ion Storage
Manganese hexacyanoferrate (MnHCF) with an open framework suitable is suitable for accommodating sodium ions. However, it suffers from severe capacity decay caused by the large structural deformation resulting from the Jahn-Teller (J-T) distortion of the Mn-N 6 octahedra. To suppress the J-T distortion of MnHCF, a strategy of vacancy engineering combined with the introduction of Ni was proposed. A Ni-doped MnHCF (K 1.95 Na 0.05 Ni 0.02 Mn 0.93 [Fe(CN) 6 ] □ 0.05 ·0.41H 2 O) with Mn vacancies and low crystal water content is prepared to suppress the J-T distortion of MnHCF. This material can deliver an improved capacity retention of 80% at 0.5C after 100 cycles. This work provides vacancy and composition engineering strategies for effective suppression of J-T distortion in MnHCF framework towards high-performance sodium-ion batteries
Year of publication: |
[2022]
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Authors: | El-Hady, Deia Abd ; Lyu, Yuxiang ; Zhan, Sikai ; Yang, Jixiang ; Wang, Yian ; Yang, Fei ; Zhao, Qinglan ; Gu, Meng ; Shao, Minhua |
Publisher: |
[S.l.] : SSRN |
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freely available
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