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Core-Shell Fe 1- x S@Na 2.9 PS 3.95 Se 0.05 Nanorods for Room Temperature All-Solid-State Sodium Batteries with High Energy Density
Ist Teil von
ACS nano, 2018-03, Vol.12 (3), p.2809-2817
Ort / Verlag
United States
Erscheinungsjahr
2018
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
High ionic conductivity electrolyte and intimate interfacial contact are crucial factors to realize high-performance all-solid-state sodium batteries. Na
PS
Se
electrolyte with reduced particle size of 500 nm is first synthesized by a simple liquid-phase method and exhibits a high ionic conductivity of 1.21 × 10
S cm
, which is comparable with that synthesized with a solid-state reaction. Meanwhile, a general interfacial architecture, that is, Na
PS
Se
electrolyte uniformly anchored on Fe
S nanorods, is designed and successfully prepared by an in situ liquid-phase coating approach, forming core-shell structured Fe
S@Na
PS
Se
nanorods and thus realizing an intimate contact interface. The Fe
S@Na
PS
Se
/Na
PS
Se
/Na all-solid-state sodium battery demonstrates high specific capacity and excellent rate capability at room temperature, showing reversible discharge capacities of 899.2, 795.5, 655.1, 437.9, and 300.4 mAh g
at current densities of 20, 50, 100, 150, and 200 mA g
, respectively. The obtained all-solid-state sodium batteries show very high energy and power densities up to 910.6 Wh kg
and 201.6 W kg
based on the mass of Fe
S at current densities of 20 and 200 mA g
, respectively. Moreover, the reaction mechanism of Fe
S is confirmed by means of ex situ X-ray diffraction techniques, showing that partially reversible reaction occurs in the Fe
S electrode after the second cycle, which gives the obtained all-solid-state sodium battery an exceptional cycling stability, exhibiting a high capacity of 494.3 mAh g
after cycling at 100 mA g
for 100 cycles. This contribution provides a strategy for designing high-performance room temperature all-solid-state sodium battery.