Customized Electrolyte and Host Structures Enabling High-Energy-Density Anode-Free Potassium–Metal Batteries

ACS Energy Letters, Год журнала: 2023, Номер 8(8), С. 3467 - 3475

Опубликована: Июль 19, 2023

Potassium shows great potential to replace lithium in energy storage for its high abundance and comparable density. However, issues including an unstable interphase, dendrite growth, volume change restrict the development of potassium metal batteries, so far, there is no single cure that works once all. Here anode-free battery demonstrated by introducing a customized electrolyte host structures simultaneously promote efficiency, reversibility, First, diluted high-concentration with fast kinetics stability triggers inorganic-rich durable interphase. Meanwhile, carbonaceous containing narrowly distributed mesopores (MCNF) favors reduced surface area but enough inner space. Together, they achieve average Coulombic efficiency (CE) 99.3% initial CE 95.9% at 3 mA cm–2–3 h cm–2. Anode-free MCNF||Prussian blue (PB) cells are delivered 100 reversible cycles density 362 W kg–1.

Язык: Английский

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Structure‐Engineered Low‐Cost Carbon Microbelt Hosts for Highly Robust Potassium Metal Anode

Advanced Functional Materials, Год журнала: 2023, Номер 33(36)

Опубликована: Май 16, 2023

Abstract Potassium metal as anode is an ideal material for the assembly of high specific energy batteries. However, safety issues caused by unrestricted dendrite growth and “dead K” generation severely limit their application. Here, based on concept waste recycling, a structural engineering strategy (chemical exfoliation enzyme‐assisted synergistic method) proposed to prepare oxygen‐containing functionalized porous carbon microbelts (OPCMs) freestanding K hosts. The structure, uniformly distribution nanospheres, presence functional groups reduce barrier nucleation promote deposition kinetics. Benefitting from these advantages OPCMs, OPCMs‐based composite anodes (K‐OPCMs) are free obvious during plating process. Symmetric cells assembled with K‐OPCMs maintain stable overpotential 40 mV after cycling more than 800 h at 1 mA cm −2 . In addition, K‐OPCMs//organic cathode (PTCDA) full cell exhibits excellent rate capability (96% capacity retention, 100–2000 g −1 , which superior most reported potassium batteries) ultralong lifespan (97.8 1500 cycles 2000 ). This study illustrates effectiveness structure‐engineered provides guiding insight achieving high‐performance rechargeable

Язык: Английский

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Vertically aligned MnO2 nanosheets on carbon fiber cloth as lithiophilic host enables dendrite-free lithium metal anode

Electrochimica Acta, Год журнала: 2023, Номер 464, С. 142896 - 142896

Опубликована: Июль 18, 2023

Язык: Английский

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Nonfluorinated Antisolvents for Ultrastable Potassium-Ion Batteries

ACS Nano, Год журнала: 2023, Номер 17(16), С. 16135 - 16146

Опубликована: Авг. 10, 2023

A robust interface between the electrode and electrolyte is essential for long-term cyclability of potassium-ion batteries (PIBs). An effective strategy achieving this objective to enhance formation an anion-derived, robust, stable solid-electrolyte interphase (SEI) via structure engineering. Herein, inspired by application antisolvents in recrystallization, we propose a nonfluorinated antisolvent optimize solvation structure. In contrast conventional localized superconcentrated introducing high-fluorinated ether solvent, anion-cation interaction considerably enhanced certain amount into phosphate-based electrolyte, thereby promoting thin SEI ensure excellent cycling performance PIBs. Consequently, exhibits superior stability K||graphite cell (negligible capacity degradation after 1000 cycles) K||K symmetric (>2200 h), as well improved oxidation stability. This study demonstrates feasibility optimized engineering with antisolvent, providing approach realizing electrochemical energy storage systems

Язык: Английский

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Nonflammable Phosphate‐Based Electrolyte for Safe and Stable Potassium Batteries Enabled by Optimized Solvation Effect

Angewandte Chemie, Год журнала: 2024, Номер 136(29)

Опубликована: Май 6, 2024

Abstract Current potassium‐ion batteries (PIBs) are limited in safety and lifetime owing to the lack of suitable electrolyte solutions. To address these issues, herein, we report an innovative non‐flammable design strategy that leverages optimal moderate solvation phosphate‐based solvent which strikes a balance between capability salt dissociation ability, leading superior electrochemical performance. The formulated simultaneously exhibits advantages low concentration (only 0.6 M), viscosity, high ionic conductivity, oxidative stability, safety. Our also promotes formation self‐limiting inorganic‐rich interphases at anode surface, alongside robust cathode‐electrolyte interphase on iron‐based Prussian blue analogues, mitigating electrode/electrolyte side reactions preventing Fe dissolution. Notably, PIBs employing our exhibit exceptional durability, with 80 % capacity retention after 2,000 cycles high‐voltage 4.2 V coin cell. Impressively, larger scale pouch cell, it maintains over 81 its initial 1,400 1 C‐rate average Coulombic efficiency 99.6 %. This work represents significant advancement toward realization safe, sustainable, high‐performance PIBs.

Язык: Английский

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Unraveling the Nucleation and Growth Mechanism of Potassium Metal on 3D Skeletons for Dendrite-Free Potassium Metal Batteries

ACS Nano, Год журнала: 2024, Номер 18(11), С. 8496 - 8510

Опубликована: Март 8, 2024

Designing three-dimensional (3D) porous carbonaceous skeletons for K metal is one of the most promising strategies to inhibit dendrite growth and enhance cycle life potassium batteries. However, nucleation mechanism on 3D remains ambiguous, rational design suitable hosts still presents a significant challenge. In this study, relationships between binding energy toward are systematically studied. It found that high can effectively decrease barrier, reduce volume, prevent growth, which applied guide current collectors. Density functional theory calculations show P-doped carbon (P-carbon) exhibits highest compared other elements (e.g., N, O). As result, K@P-PMCFs (P-binding multichannel nanofibers) symmetric cell demonstrates an excellent stability 2100 h with overpotential 85 mV in carbonate electrolytes. Similarly, perylene-3,4,9,10-tetracarboxylic dianhydride || achieves ultralong (85% capacity retention after 1000 cycles). This work provides valuable reference

Язык: Английский

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Rapid and Up‐Scalable Flash Fabrication of Graphitic Carbon Nanocages for Robust Potassium Storage

Advanced Functional Materials, Год журнала: 2024, Номер 34(32)

Опубликована: Март 13, 2024

Abstract Graphitic carbon nanocages (CNCs) have garnered attention as viable candidates for potassium storage, primarily due to their notable crystallinity, large surface area, and rich porosity. Yet, the development of a rapid, scalable, economically feasible synthesis approach CNCs persists formidable challenge. This study presents rapid (millisecond‐scale) scalable (gram‐scale) method fabricating mesoporous characterized by high purity orderly graphitic structures, utilizing flash Joule heating technique. Employed CNC electrode developed herein exhibits exceptional performance metrics, including initial capacity, rate capability, cycling stability, surpassing numerous carbonaceous materials previously documented. Impressively, it delivers capacity 312.3 mAh g −1 at 0.1 A , maintains 175.1 2.0 retains 219.6 over 1000 cycles 1.0 . Molecular dynamics simulations in situ characterizations are employed elucidate this robust behavior. work underscores significant advantages technique synthesizing storage applications.

Язык: Английский

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Heteroatom Immobilization Engineering toward High-Performance Metal Anodes

ACS Nano, Год журнала: 2024, Номер unknown

Опубликована: Сен. 11, 2024

Heteroatom immobilization engineering (HAIE) is becoming a forefront approach in materials science and engineering, focusing on the precise control manipulation of atomic-level interactions within heterogeneous systems. HAIE has emerged as an efficient strategy to fabricate single-atom sites for enhancing performance metal-based batteries. Despite significant progress achieved through metal anodes batteries, several critical challenges such dendrites, side reactions, sluggish reaction kinetics are still present. In this review, we delve into fundamental principles underlying heteroatom anodes, aiming elucidate its role electrochemical We systematically investigate how facilitates uniform nucleation inhibits reactions at anode-electrolyte interface, promoting desolvation ions accelerating Finally, discuss various strategies implementing electrode materials, high-temperature pyrolysis, vacancy reduction, molten-salt etching anchoring. These include selecting appropriate heteroatoms, optimizing methods, constructing material architectures. They can be utilized further refine enhance capabilities facilitate widespread application next-generation battery technologies.

Язык: Английский

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Optimized K⁺ Deposition Dynamics via Potassiphilic Porous Interconnected Mediators Coordinated by Single‐Atom Iron for Dendrite‐Free Potassium Metal Batteries

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 9, 2025

Abstract Potassium metal batteries are emerging as a promising high‐energy density storage solution, valued for their cost‐effectiveness and low electrochemical potential. However, understanding the role of potassiphilic sites in nucleation growth remains challenging. This study introduces single‐atom iron, coordinated by nitrogen atoms 3D hierarchical porous carbon fiber (Fe─N‐PCF), which enhances ion electron transport, improves diffusion kinetics, reduces energy barriers potassium deposition. Molten infusion experiments confirm Fe─N‐PCF's strong properties, accelerating adsorption kinetics improving deposition performance. According to Scharifker‐Hills model, traditional substrates without cause instantaneous nucleation, leading dendritic growth. In contrast, integration porosity promotes uniform progressive dense deposition, confirmed dimensionless i 2 /i max versus t/t plots real‐time situ optical microscopy. Consequently, X‐ray diffraction demonstrated stable cycling over 1900 h, while Fe─N‐PCF@K||PTCDA full cell retained 69.7% its capacity after 2000 cycles (72 mAh g −1 ), with voltage hysteresis 0.876 V, confirming potential high extended cycle life, paving way future advancements technology.

Язык: Английский

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High S-doped amorphous carbon/carbon quantum dots coupled micro-frame for highly efficient potassium storage

Journal of Colloid and Interface Science, Год журнала: 2023, Номер 652, С. 1522 - 1532

Опубликована: Авг. 23, 2023

Язык: Английский

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