Ion/Electron Redistributed 3D Flexible Host for Achieving Highly Reversible Li Metal Batteries. Issue 29 (24th June 2022)

• Record Type: Journal Article
• Authors: Jiang, Huai; Zhou, Yangen; Guan, Caohong; Bai, Maohui; Qin, Furong; Yi, Maoyi; Li, Jie; Hong, Bo; Lai, Yanqing
• Is Part Of: Small. Volume 18:Issue 29(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-24
• Subjects: cobalt phosphide (CoP) nanoparticles -- high reversibility -- ion/electron redistribution -- lithium metal anodes -- metal–organic frameworks; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202107641
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 3D carbon frameworks are promising hosts to achieve highly reversible lithium (Li) metal anodes, whereas insufficient effects are attributed to their single electron conductivity causing local aggregating of electron/Li + and uncontrollable Li dendrites. Herein, an ion/electron redistributed 3D flexible host is designed by lithiophilic carbon fiber cloth (CFC) modified with metal–organic framework (MOF)‐derived porous carbon sheath with embedded CoP nanoparticles (CoP‐C@CFC). Theory calculations demonstrate the strong binding energy and plenty of charge transfer from the reaction between CoP and Li atom are presented, which is beneficial to in situ construct a Li3 P@Co ion/electron conductive interface on every single CoP‐C@CFC. Thanks to the high ionic conductive Li3 P and electron‐conductive Co nanoparticles, the rapid dispersion of Li + and obviously reduced local current density can be achieved simultaneously. Furthermore, in situ optical microscopy observations display obvious depression for volume expansion and Li dendrites. As expected, a miraculous average Coulombic efficiency (CE) of 99.96% over 1100 cycles at 3 mA cm ‐2 and a low overpotential of 11.5 mV with prolonged cycling of over 3200 h at 20% depth of discharge are successfully obtained. Consequently, the CoP‐C@CFC‐Li||LiFePO4 full cells maintain a capacity retention of 95.8% with high CE of 99.96% over 500 cycles at 2 C and excellent rate capability. Abstract : An ion/electron redistributed 3D flexible host is designed by lithiophilic carbon fiber cloth modified with MOF‐derived porous carbon sheath with embedded CoP nanoparticles (CoP‐C@CFC). During the Li plating, the in situ formed Li3 P@Co conductive interface on CoP‐C@CFC realizes Li + /charge redistribution, which achieves highly average Coulombic efficiency of 99.96% over 1100 cycles at practical current density of 3 mA cm −2 .