Achieving Stable and Ultrafast Potassium Storage of Antimony Anode via Dual Confinement of MXene@Carbon Framework

Small Methods, Год журнала: 2023, Номер 7(8)

Опубликована: Фев. 24, 2023

Antimony-based anode materials are recognized for their high potassium storage capacities and appropriate operating potentials. However, the large volume expansion of Sb during potassiation/depotassiation process, which results in a quick capacity decay, severely limits its practical application potassium-ion batteries (PIBs). Here, carbon-coated Sb/MXene heterostructure composite (CSM) is synthesized by adsorption Sb3+ on MXene nanosheets via Sb-O-Ti bonds followed carbothermic reduction to construct dual-confined MXene@carbon conductive framework capable withstanding conducive enabling accelerated electron transfer kinetics. The CSM composite, particularly CSM-700, when configured as an PIBs, realized (484.4 mAh g-1 at 0.1 A ), ultra-stable cycling performance with reversible 435.9 after 100 cycles corresponding retention rate 90.0%, superior 323.0 1 . proposed strategy offers simple route high-performance Sb-based anodes advanced PIBs.

Язык: Английский

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Rational Design of Janus Metal Atomic‐Site Catalysts for Efficient Polysulfide Conversion and Alkali Metal Deposition: Advances and Prospects

Advanced Functional Materials, Год журнала: 2024, Номер 34(25)

Опубликована: Фев. 1, 2024

Abstract Although metal–sulfur batteries (M–S batteries, M = Li, Na, K) are promising next‐generation energy‐storage devices because of ultrahigh theoretical energy density, low cost, and environmentally friendliness, their practical applications significantly hindered by the shuttle effect polysulfides growth alkali metal dendrites. These issues can be mitigated using Janus atomic‐site catalysts, which possess maximum atom utilization efficiency (≈100%), adjustable electronic structures, tailorable catalytic sites, thereby effectively improving electrochemical performance M–S batteries. In this review, recent progress development atomic‐sites on properties, synthesis, characterizations reviewed. Then, advances in catalysts intended for accelerating polysulfide conversion regulating deposition, briefly introducing working principles systematically summarized. Furthermore, a high emphasis is placed effective regulation strategies rational design Finally, current challenges future research directions also presented to develop high‐efficiency high‐energy

Язык: Английский

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Nanomesh NiO-modified carbon cloth for highly efficient self-supporting potassium metal anodes

Chemical Engineering Journal, Год журнала: 2024, Номер 490, С. 151521 - 151521

Опубликована: Апрель 23, 2024

Язык: Английский

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High Entropy Induced Local Charge Enhancement Promotes Frank–Van der Merwe Growth for Dendrite‐Free Potassium Metal Batteries

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 13, 2024

Abstract Potassium metal batteries (PMBs) are promising for next‐generation energy storage. However, the high reactivity of anode causes instability in solid electrolyte interface (SEI), resulting Volmer‐Weber (V‐W) type deposition. To achieve uniform Frank‐van der Merwe (F‐M) deposition, entropy alloy nanoparticles designed (HEA NPs) with equimolar ratios Mn, Fe, Co, Cu, and Ni to enhance substrate‐K interface. HEA NPs K affinity N‐doped nanocarbon fiber substrate (N‐PCNF) maximize ion electron transport efficiency. The dendrite‐free horizontal growth confirmed through Operando X‐ray diffraction (XRD) optical microscopy (OM). Consequently, asymmetric cell exhibits ultra‐long cycling stability 2350 hours at a current density 8 mA cm −2 . full composed molten diffusion into decorated N‐PCNF perylene‐3,4,9,10‐tetracarboxylic dianhydride cathode (HEA‐N‐PCNF‐K||PTCDA) delivers an 331 W h kg −1 remains stable over 2000 cycles. This study offers pathway innovative PMBs designs broad application prospects.

Язык: Английский

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Alumina ‐ Stabilized SEI and CEI in Potassium Metal Batteries

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(31)

Опубликована: Май 15, 2024

Aluminum oxide (Al

Язык: Английский

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