Electronic State‐Modulated Ni₄N/Zn₃N₂ Heterogeneous Nanosheet Arrays Toward Dendrite‐Free and Kinetic‐Enhanced Li‐S Full Batteries

Advanced Functional Materials, Год журнала: 2024, Номер 34(38)

Опубликована: Апрель 26, 2024

Abstract The applications of lithium (Li)–sulfur (S) batteries are simultaneously hampered by the unlimited dendritic Li growth and sluggish redox kinetics polysulfides (LiPSs). In this work, an electronic state‐modulated Ni 4 N/Zn 3 N 2 heterogeneous nanosheet arrays is painstakingly fabricated on surface carbon cloth (CC@Ni ) as efficient bi‐service host to promote uniform deposition boost LiPSs catalysis. It found that structure heterostructure modulated realize a rational transition metal d‐band center, its built‐in electric field (BIEF) within heterointerfaces facilitates interfacial charge transfer, resulting in low deposition/migration energy barrier adsorption/catalytic conversion kinetics. As result, as‐prepared CC@Ni ‐Li anode can enable Li||Li symmetrical cells possess long‐term lifespan over 500 h even at 10 mA cm −2 /20 mAh , as‐assembled LiNi 0.8 Co 0.1 Mn O ||CC@Ni full cell also shows excellent cycling performance (95.8% capacity retention after 100 cycles). When used for both S loading, ‐S||CC@Ni exhibits outstanding stability (744 g −1 1000 cycles 2C). This work highlights great potential heterostructures fabricating ideal bi‐serve hosts electrodes.

Язык: Английский

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In Situ Integration of a Flame Retardant Quasisolid Gel Polymer Electrolyte with a Si-Based Anode for High-Energy Li-Ion Batteries

ACS Nano, Год журнала: 2024, Номер 18(20), С. 13384 - 13396

Опубликована: Май 13, 2024

Silicon (Si) stands out as a promising high-capacity anode material for high-energy Li-ion batteries. However, drastic volume change of Si during cycling leads to the electrode structure collapse and interfacial stability degradation. Herein, multifunctional quasisolid gel polymer electrolyte (QSGPE) is designed, which synthesized through in situ polymerization methylene bis(acrylamide) with silica-nanoresin composed nanosilica trifunctional cross-linker cells, leading creation "breathing" three-dimensional elastic conducting framework that seamlessly integrates an electrode, binder, electrolyte. The silicon particles within are encapsulated by buffering QSGPE after cross-linking polymerization, synergistically interacts existing PAA binder reinforce stabilize interface. In addition, formation LiF- Li3N-rich SEI layer further improves property. demonstrates wide electrochemical window until 5.5 V, good flame retardancy, high ionic conductivity (1.13 × 10–3 S cm–1), Li+ transference number 0.649. advanced cell design endow both nano- submicrosized (smSi) anodes initial Coulombic efficiencies over 88.0% impressive up 600 cycles at 1 A g–1. Furthermore, NCM811//Si achieves capacity retention ca. 82% 100 0.5 This work provides effective strategy extending life constructing integrated

Язык: Английский

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Multiscale Micro‐Nano Hierarchical Porous Germanium with Self‐Adaptive Stress Dispersion for Highly Robust Lithium‐Ion Batteries Anode

Advanced Energy Materials, Год журнала: 2024, Номер 14(13)

Опубликована: Фев. 6, 2024

Abstract The manipulation of stress in high‐capacity microscale alloying anode materials, which undergo significant volumetric variation during cycling, is crucial prerequisite for improved their cycling capability. In this work, an innovative structural design strategy proposed scalable fabrication a unique 3D highly porous micro structured germanium (Ge) featuring micro‐nano hierarchical architecture as viable high‐performance lithium‐ion batteries (LIBs). resultant micro‐sized Ge, consisting interconnected nanoligaments and bicontinuous nanopores, endowed with high activity, decreased Li + diffusion distance alleviated volume variation, appealing ideal platform in‐depth understanding the relationship between evolution. Such Ge being delivers record initial Coulombic efficiency 92.5%, large capacity 2,421 mAh cm −3 at 1.2 mA −2 , exceptional rate capability (805.6 g −1 10 Ag ) stability (over 90% retention after 1000 cycles even 5 A ), largely outperforming reported Ge‐based anodes LIBs. Furthermore, its underlying storage mechanism dispersion behavior are explicitly revealed by combined substantial situ/ex situ experimental characterizations theoretical computation. This work provides novel insights into rational durable toward high‐energy

Язык: Английский

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Crack‐Resistant Si‐C Hybrid Microspheres for High‐Performance Lithium‐Ion Battery Anodes

Small, Год журнала: 2024, Номер 20(46)

Опубликована: Авг. 1, 2024

Abstract To effectively solve the challenges of rapid capacity decay and electrode crushing silicon‐carbon (Si‐C) anodes, it is crucial to carefully optimize structure Si‐C active materials enhance their electron/ion transport dynamic in electrode. Herein, a unique hybrid microsphere Si/C/CNTs/Cu with surface wrinkles prepared through simple ultrasonic atomization pyrolysis calcination method. Low‐cost nanoscale Si waste embedded into carbon matrix, cleverly combined flexible electrical conductivity nanotubes (CNTs) copper (Cu) particles, enhancing both crack resistance kinetics entire material. Remarkably, as lithium‐ion battery anode, fabricated exhibits stable cycling for up 2300 cycles even at current 2.0 A g −1 , retaining ≈700 mAh retention rate 100% compared started . Additionally, when paired an NCM523 cathode, full cell 135 after 100 1.0 C. Therefore, this synthesis strategy provides insights design long‐life, practical anode micro/nano‐spherical structures.

Язык: Английский

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High‐Performance Polyimide Covalent Organic Frameworks for Lithium‐Ion Batteries: Exceptional Stability and Capacity Retention at High Current Densities

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Сен. 30, 2024

Organic polymers are considered promising candidates for next-generation green electrode materials in lithium-ion batteries (LIBs). However, achieving long cycling stability and capacity retention at high current densities remains a significant challenge due to weak structural low conductivity. In this study, we report the synthesis of two novel polyimide covalent organic frameworks (PI-COFs), COF-JLU85 COF-JLU86, by combining truxenone-based triamine linear acid anhydride through polymerization. These PI-COFs feature layers with pore channels embedded 18 carbonyl groups, facilitating rapid diffusion enhancing under densities. Compared previously reported polymer materials, COF-JLU86 demonstrates excellent performance densities, an impressive specific 1161.1 mA h g

Язык: Английский

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