Relay Catalyst for Accelerating Lithium Polysulfide Conversion Kinetics and Long-life Lithium Sulfur Batteries

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110896 - 110896

Published: March 1, 2025

Language: Английский

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Activating Transition-Metal Oxides through In Situ Regulation of Lower Hubbard Band for Catalytic Conversion of Lithium Polysulfides

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Catalytic conversion of lithium polysulfides (LiPSs) is regarded as an effective avenue to tackle the shuttle effect lithium-sulfur (Li-S) batteries, especially based upon transition-metal oxides (TMOs). However, activity origin and corresponding mechanistic insights into such catalytic systems remain elusive. Herein, activated state associated with lower Hubbard band (LHB) transition proposed elucidate TMOs by taking Mn3O4 a model electrocatalyst. Specifically, broadening LHB width, upshift position, orbital rearrangement LHB, triggered in situ substitution O atoms S LiPSs under working conditions, synergistically enable fast electron transfer modulate adsorption capability moderate level. Benefiting from these advantages, electrocatalyst converted torpid for expediting LiPS conversion. Eventually, Li-S batteries assembled deliver excellent rate performance over 6 C outstanding cycling stability 1000 cycles. Moreover, Ah-scale pouch cell constructed delivers notable energy density 388.1 W h kg-1. Our work offers promising pathway on regulation designing high-performance electrocatalysts beyond.

Language: Английский

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Structurally Mutualized Ti₃C₂@Ni₂P Catalysts Realize Interfacial Charge Redistribution for Facilitating Redox Reaction Kinetics in Lithium–Sulfur Batteries

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(19), P. 28267 - 28275

Published: May 6, 2025

The sluggish redox reaction kinetics of polysulfides (LiPSs) seriously hinders the performance lithium-sulfur batteries (LSBs). To effectively accelerate conversion sulfur species, constructing heterostructure catalysts has emerged as a promising strategy. In this research, Ti3C2@Ni2P electrocatalysts heterostructured with mutual structural support were fabricated by straightforward phosphorylation method. synergistic integration Ti3C2 substrate and uniformly distributed Ni2P particles solves component agglomeration stacking, accordingly, exposing more active sites anchoring LiPSs. Moreover, built-in electric field could be formed between heterointerfaces to promote transfer Li+/e-, reducing energy barriers for LiPSs redox. Based on these advantages, LSBs assembled achieve an initial capacity 1180 mAh g-1 at 0.2 C cycling decay rate only 0.031% after 1000 cycles 1 C. Besides, area 4.0 cm-2 was achieved even loading 6.1 mg cm-2.

Language: Английский

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MOF-Derived CoOx–CeO2−y/C Heterojunction Synergistically Promotes the Deposition and Decomposition of Li2S in Lithium–Sulfur Batteries

Transactions of Tianjin University, Journal Year: 2025, Volume and Issue: unknown

Published: May 9, 2025

Language: Английский

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