In:
Advanced Materials, Wiley, Vol. 32, No. 34 ( 2020-08)
Abstract:
Lithium–sulfur batteries (LSBs) are regarded as promising next‐generation energy storage systems, however, the uncontrollable dendrite formation and serious polysulfide shuttling severely hinder their commercial success. Herein, a powerful 3D sponge nickel (SN) skeleton plus in situ surface engineering strategy, to address these issues synergistically, is reported, and a high‐performance flexible LSB device is constructed. Specifically, the rationally designed spray‐quenched lithium metal on the SN matrix (solid electrolyte interface (SEI)@Li/SN), as dendrite inhibitor, combines the merits of the 3D lithiophilic SN skeleton and the in situ formed SEI layer derived from the spray‐quenching process, and thereby exhibits a steady overpotential within 75 mV for 1500 h at 5 mA cm −2 /10 mA h cm −2 . Meanwhile, in situ surface sulfurization of the SN skeleton hybridizing with the carbon/sulfur composite (SC@Ni 3 S 2 /SN) serves as efficient lithium polysulfide adsorbent to catalyze the overall reaction kinetics. COMSOL Multiphysics simulations and density functional theory calculations are further conducted to explore the underlying mechanisms. As a proof of concept, the well‐designed SEI@Li/SN||SC@Ni 3 S 2 /SN full cell shows excellent electrochemical performance with a negative/positive ratio in capacity of ≈2 and capacity retention of 99.82% at 1 C under mechanical deformation. The novel design principles of these materials and electrodes successfully shed new light on the development of flexible LSBs.
Type of Medium:
Online Resource
ISSN:
0935-9648
,
1521-4095
DOI:
10.1002/adma.202003657
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
1474949-X
Permalink