Ferrocene-Based Mixed-Valence Metal–Organic Framework as an Efficient and Stable Cathode for Lithium-Ion-Based Dual-Ion Battery
- 30 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (29), 32719-32725
- https://doi.org/10.1021/acsami.0c07729
Abstract
Organic anion-hosting cathodes are remarkably attractive platform candidates for lithium-ion-based dual-ion batteries (LDIBs) due to their various advantages such as variety, designable, and adjustable. Here, a new organic anion-hosting mixed-valence metal-organic framework cathode (CoⅡ2CoⅢ(DFc)2(OH)3·H2O, abbreviated as Co(DFc)x), is firstly employed in LDIBs. With the redox reactions happening in the couples of Fe2+/Fe3+ and Co2+/Co3+, PF6− anions can be incorporated into the cathode and reversibly released into the LiPF6-based electrolyte. Meanwhile, benefiting from its unique structure and insolubility, Co(DFc)x shows a high energy density of 632 Wh kg−1 (vs. lithium anode), a high operating potential of 3.63 V (vs. Li+/Li), a high reversible (discharge) capacity of 170 mAh g−1 at 50 mA g−1 (the 3rd cycle), an excellent rate performance (up to 2000 mA g−1, 5 minutes for one cycle), and extraordinary cycling stability (an average capacity of 74.9 mAh g−1 for 8000 cycles at 2000 mA g−1).Funding Information
- Ministry of Education - Singapore (MOE 2017-T2-1-021, MOE 2018-T2-1-070, RG 111/17, RG 113/18, RG 114/16, RG 2/17)
- University of Electronic Science and Technology of China
- National Natural Science Foundation of China (21473022, 21673033)
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