am9b13313_si_001.pdf (1.73 MB)
Argyrodite Solid Electrolyte with a Stable Interface and Superior Dendrite Suppression Capability Realized by ZnO Co-Doping
journal contribution
posted on 2019-10-17, 21:43 authored by Ting Chen, Long Zhang, Zhaoxing Zhang, Peng Li, Hongqiang Wang, Chuang Yu, Xinlin Yan, Limin Wang, Bo XuDespite
the high ionic conductivity and good machinability, the
application of sulfide solid electrolytes (SEs) is severely limited
by the poor compatibility of oxide cathodes with Li metals. Herein,
a ZnO co-doping strategy is proposed to enhance the chemical and electrochemical
performance of sulfide SEs. Given the synergistic effect by incorporation
of ZnO, the argyrodite electrolyte achieves superior interfacial stability
and Li dendrite suppression capability. By in-depth ex situ analyses,
the enhancement is ascribed to LiZn and Li3OBr formed in
the argyrodite/Li interface and a reduced electronic conductivity
arising from the ZnO doping. In addition, O doping improves the air
stability for argyrodite without degrading the ionic conductivity
because of the compensation by Zn doping. Hence, all-solid-state batteries
with ZnO-doped electrolytes achieve higher initial Coulombic efficiency
and a larger specific capacity than those of the ZnO-free electrolyte.
ZnO-doped sulfide SEs are promising to develop all-solid-state Li-metal
batteries.
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O dopingStable InterfaceLi metalsSuperior Dendrite Suppression Capability RealizedZnO-free electrolyteLi dendrite suppression capabilityconductivityall-solid-state batteriesZnO dopingCoulombic efficiencyZnO Co-DopingLi 3 OBrZnO-doped electrolytesall-solid-state Li-metal batteriesZnO-doped sulfide SEssulfide SEselectrochemical performanceair stabilityZn dopingoxide cathodesZnO co-doping strategyargyrodite electrolyte
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