Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 29, Pages 32719-32725Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c07729
Keywords
ferrocene-based; mixed-valence; metal-organic framework; cathode; lithium-ion-based dual-ion battery
Funding
- National Natural Science Foundation of China [21473022, 21673033]
- Academic Exchange Special Fund in UESTC
- AcRF Tier 1, Singapore [RG 111/17, RG 2/17, RG 114/16, RG 113/18]
- AcRF Tier 2, Singapore [MOE 2017-T2-1-021, MOE 2018-T2-1-070]
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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 ((Co2CoIII)-Co-II(DFc)(2)(OH)(3)center dot H2O, abbreviated as Co(DFc)x) is first 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 SO mA g(-1) (the third cycle), an excellent rate performance (up to 2000 mA g(-1), 5 min for one cycle), and extraordinary cycling stability (an average capacity of 74.9 mAh g(-1) for 8000 cycles at 2000 mA g(-1)).
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