+Iron hexacyanocobaltate metal-organic framework: Highly reversible and stationary electrode material with rich borders for lithium-ion batteries

Abstract

Metal-organic frameworks (MOFs) are attractive electrode material candidates for lithium-ion batteries (LIBs) and are garnering significant interest due to their tunable pore size and intriguing electrochemical properties. A border-rich iron (Fe3+) hexacyanocobaltate (FeHCCo) MOF is synthesized via a facile and low-cost co-precipitation method and evaluated as a cathode material for LIBs. The MOF delivered reversible capacities corresponding to 136 and 57 mAh g(-1) at 0.63 and 6.25C, respectively. Furthermore, a lithiation capacity of 116 mAh g(-1) at 1.25C was maintained with a Coulombic efficiency of 99.6%. The high electrochemical performance can be attributed to the highly reversible open-framework crystal texture of border-rich FeHCCo, which may provide new insights on the application of MOFs as viable electrode materials in rechargeable LIBs. (C) 2019 Elsevier B.V. All rights reserved.