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- W4220808418 abstract "• Nanopores within the NGM endow K + ions with a high-flux and fast transport kinetics. • Homogeneous distribution of K + ions within the NGM is achieved to avoid the formation and growth of K dendrites. • The symmetric K@NGM cell delivers an ultra-low overpotential of 12.4 mV after 1700 h. • A 4 V and dendrite-free KMnHCF/G‖K@NGM full cell exhibits outstanding cycling stabilities and rate capabilities. The uneven distribution and slow diffusion kinetics of potassium ions (K + ) result in the formation and growth of K dendrites as well as poor rate capabilities, restricting the development of K metal anodes (KMAs). Paired with a Mn-based Prussian blue (PB) cathode, the KMA-based full battery exhibits a low average discharging voltage of ≈3.6 V and a high overpotential. Herein, a N-doped graphene nanomesh (NGM) acts as a conductive and potassiophilic host to solve this issue. First, the NGM enables K + ions to rapidly transport its nanopores and edges to reach the whole electrode, offering unblocked transport channels for K + ions and thus acquiring an enhanced rate capability. Second, the N atoms and defects within NGM reduce the nuclear energy barrier of K + ions and induce their homogeneous deposition, avoiding the formation of K dendrites. Third, the nano-/micro-pores within NGM can accommodate the volume exchange of KMA during cycles, improving its cycling stability. Benefiting from these merits, the symmetric K@NGM cell delivers an ultra-low overpotential of 12.4 mV after 1700 h. Matched with a K 1.7 Mn[Fe(CN) 6 ] 0.9 /graphene cathode, a 4 V and dendrite-free KMnHCF/G‖K@NGM full cell is designed, which exhibits excellent cycling stabilities and rate capabilities." @default.
- W4220808418 created "2022-04-03" @default.
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- W4220808418 date "2022-08-01" @default.
- W4220808418 modified "2023-10-16" @default.
- W4220808418 title "Fast and homogeneous ion regulation toward a 4 V, high-rate and dendrite-free potassium metal battery" @default.
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- W4220808418 doi "https://doi.org/10.1016/j.cej.2022.135927" @default.
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