Polymorphism and Fast Potassium‐Ion Conduction in the T5 Supertetrahedral Phosphidosilicate KSi<sub>2</sub>P<sub>3</sub>

Haffner, Arthur; Hatz, Anna‐Katharina; Zeman, Otto E. O.; Hoch, Constantin; Lotsch, Bettina V.; Johrendt, Dirk

doi:10.1002/anie.202101187

Cited by 29 publications

(36 citation statements)

References 49 publications

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“…However, the research on K‐ion conducting SSE is still at an early stage. As summarized by Johrendt et al., only a few oxide‐based K‐ion conductors are known with rare examples exceeding 10 −4 S cm −1 at room temperature [9] . One such example is the commercial K‐β′′‐alumina which shows ionic conductivity of 8×10 −4 S cm −1 at room temperature [10] .…”

Section: Figurementioning

confidence: 99%

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

et al. 2022

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Solid-state K-ion conducting electrolytes are key elements to address the current problems in K secondary batteries. Here, we report a sulfide-based Kion conductor K 3 SbS 4 with a low-activation energy of 0.27 eV. W-doped K 3À x Sb 1À x W x S 4 (x = 0.04, 0.06, 0.08, 0.10 and 0.12) compounds were also explored for increasing vacancy concentrations and improving ionic conductivity. Among them, K 2.92 Sb 0.92 W 0.08 S 4 exhibits the highest conductivity of 1.4 × 10 À 4 S cm À 1 at 40 °C, which is among the best reported potassium-ion conductors at ambient temperature. In addition, K 2.92 Sb 0.92 W 0.08 S 4 is electrochemically stable with long-chained potassium polysulfide of K 2 S x . A room-temperature solid potassium-sulfur (KÀ S) battery system has therefore been successfully demonstrated, which is the first KÀ S battery prototype using non-commercial inorganic-based electrolyte to block the polysulfide shuttle.

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Section: Figurementioning

confidence: 99%

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

et al. 2022

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“…In 2018, Yuan et al reported polycrystalline K 2 Fe 4 O 7 with an extreme high ionic conductivity of 5.0 × 10 –2 S cm –1 at room temperature . More recently, supertetrahedral phosphidosilicate KSi 2 P 3 with a bulk ionic conductivity of 2.6 × 10 –4 S cm –1 at 25 °C has been reported . However, the electrochemical stability of KSi 2 P 3 was not mentioned.…”

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confidence: 99%

Antiperovskite K₃OI for K-Ion Solid State Electrolyte

Zheng

Fang

Fan

et al. 2021

J. Phys. Chem. Lett.

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Discovering new K-ion solid-state electrolytes is crucial for the emerging K-batteries to improve energy density, cycle life, and safety. Here, we present a combined experimental and theoretical study of antiperovskite K 3 OI as a K-ion solid-state electrolyte. A solid−solid phase transition at approximately 240 °C induces an increase in ionic conductivity by 2 orders of magnitude. Anion disorder in the I−O sublattice is found to be a potential mechanism for the observed phase transition. The Ba-doped K 3 OI sample K 2.9 Ba 0.05 OI achieves 3.5 mS cm −1 after the phase transition with a low activation energy of 0.36 eV. Stable cycling of K/ K 2.9 Ba 0.05 OI/K symmetric cells are observed with a low overpotential of 50 mV at 0.5 mA/cm 2 at 270 °C. This study not only reports K 3 OI as a promising K-ion solid-state electrolyte that is compatible with reactive K metal but also improves the understanding of alkali antiperovskite solid-state electrolytes in general.

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“…More recently, Johrendt et al. reported the T5 KSi 2 P 3 with ambient conductivity up to 2.6×10 −4 S cm −1 , and our group reported the Ba‐doped K 3 OI antiperovskite, which possess excellent stability against reactive K metal [9, 12] …”

Section: Figurementioning

confidence: 73%

“…As summarized by Johrendt et al, only a few oxide-based K-ion conductors are known with rare examples exceeding 10 À 4 S cm À 1 at room temperature. [9] One such example is the commercial K-β''-alumina which shows ionic conductivity of 8 × 10 À 4 S cm À 1 at room temperature. [10] To reduce the grain boundary resistance of K-β''-alumina, the sintering temperature is above 1000 °C, increasing the fabrication cost and thus limiting their practical applications.…”

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confidence: 99%

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

et al. 2022

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Solid‐state K‐ion conducting electrolytes are key elements to address the current problems in K secondary batteries. Here, we report a sulfide‐based K‐ion conductor K3SbS4 with a low‐activation energy of 0.27 eV. W‐doped K3−xSb1−xWxS4 (x=0.04, 0.06, 0.08, 0.10 and 0.12) compounds were also explored for increasing vacancy concentrations and improving ionic conductivity. Among them, K2.92Sb0.92W0.08S4 exhibits the highest conductivity of 1.4×10−4 S cm−1 at 40 °C, which is among the best reported potassium‐ion conductors at ambient temperature. In addition, K2.92Sb0.92W0.08S4 is electrochemically stable with long‐chained potassium polysulfide of K2Sx. A room‐temperature solid potassium–sulfur (K−S) battery system has therefore been successfully demonstrated, which is the first K−S battery prototype using non‐commercial inorganic‐based electrolyte to block the polysulfide shuttle.

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Polymorphism and Fast Potassium‐Ion Conduction in the T5 Supertetrahedral Phosphidosilicate KSi₂P₃

Abstract: The all-solid-state battery (ASSB) is a promising

Cited by 29 publications

References 49 publications

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

Antiperovskite K₃OI for K-Ion Solid State Electrolyte

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

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Polymorphism and Fast Potassium‐Ion Conduction in the T5 Supertetrahedral Phosphidosilicate KSi2P3

Abstract: The all-solid-state battery (ASSB) is a promising

Cited by 29 publications

References 49 publications

K3SbS4 as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

K3SbS4 as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

Antiperovskite K3OI for K-Ion Solid State Electrolyte

K3SbS4 as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

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Polymorphism and Fast Potassium‐Ion Conduction in the T5 Supertetrahedral Phosphidosilicate KSi₂P₃

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries

Antiperovskite K₃OI for K-Ion Solid State Electrolyte

K₃SbS₄ as a Potassium Superionic Conductor with Low Activation Energy for K–S Batteries