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Multiple covalent interactions and open-void co-involved Mn3O4/nitrogen-doped porous carbon fiber hybrids as flexible anodes for lithium-ion batteries

Abstract

Nanophase Mn3O4 with a grain size of about 7 nm was successfully synthesized by a novel sol-gel route. To improve the electrochemical performance, the Mn3O4 grains were incorporated into metal organic frameworks-derived (MOFs-derived) nitrogen-doped highly porous carbon fibers (NPCFs), which are synthesized by the electrospinning technique. Two major keys to this work are the facile green synthesis of flexible Mn3O4/NPCFs-1.4 anodes and the better utilization of the active phase (Mn3O4) in Mn3O4/NPCFs-1.4 composites. When used as a flexible anode for lithium-ion batteries (LIBs), the Mn3O4/NPCs-1.4 exhibited an excellent flexibility and good electrochemical performance with a high specific capacity (1058 mAh g-1 at 50 mA g-1), good cyclability (no obvious capacity degradation even after a long-term cycling test up to 500 cycles) and excellent rate capability (320 mAh g-1 at 2500 mA g-1). Such an excellent anodic property can be attributed to the presence of open voids in Mn3O4/NPCFs hybrids,the robust one-dimensional (1D) structure of NPCFs as well as the multiple strong interactions between Mn3O4 and NPCFs, which collectively ensure the integrity of Mn3O4/NPCFs membranes. The sufficient open-void spaces can accommodate the volume change and ensure the high Li+ flux during the Li+ intercalation/deintercalation process. The robust 1D structure combined with the good electrical conductivity of NPCFs provides more efficient paths for ions and electrons to transfer rapidly. The excellent electrochemical performance, environmental compatibility, facile synthesized strategy and low cost of the manganese-based materials reveal the promise of Mn3O4/NPCFs-1.4 composites for the practical application.

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Publication details

The article was received on 13 Sep 2017, accepted on 07 Nov 2017 and first published on 08 Nov 2017


Article type: Paper
DOI: 10.1039/C7GC02786A
Citation: Green Chem., 2017, Accepted Manuscript
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    Multiple covalent interactions and open-void co-involved Mn3O4/nitrogen-doped porous carbon fiber hybrids as flexible anodes for lithium-ion batteries

    Z. Li, Green Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7GC02786A

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