Suppressing Intergranular Cracking with Near-Surface Layer Regulation for Electrochemical-Thermal Stabilization of LiCoO2

Materials Horizons, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

To further meet the application needs of lithium-ion batteries, developing cathodes with higher voltage and operating temperatures has become a primary goal. However, LiCoO2 encounter structural issues, particle fracture, side reactions during high-voltage high-temperature cycling. Thus, this work designs novel interface engineering approach involving near-surface Li layer regulation enhances stability R3̄m layered structure, suppressing intergranular cracking. An undistorted surface reduced phase transitions was revealed by HAADF-STEM. The post-cycle simulations XRD stabilizes interplanar spacing. strong B-O bonds lower O 2p energies, preventing oxygen loss confirmed XPS band structure. Therefore, even under 50 °C, half-cell maintains capacity retention rate 79% after 200 cycles at 5C 4.5 V.

Язык: Английский

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Layered/Olivine Composite Structure-Induced Stable Gradient Interfacial Chemistry toward High-Temperature Lithium-Ion Batteries

ACS Nano, Год журнала: 2024, Номер 18(46), С. 32065 - 32076

Опубликована: Ноя. 5, 2024

The state-of-the-art layered oxide as the cathode material for lithium-ion batteries has attracted wide attention; however, harsh operations of high-energy and high-safety energy-storage technology at high temperature is challenging owing to aggravated structural instability parasitic reactions cathodes. Herein, layered/olivine composite structure architecture designed grain surface govern constant electrochemistry in a environment, gradient LiF interlayer developed onto cathodes suppress interfacial degradation. By combination interfacial-sensitive characterizations theoretical analysis cathode/interface, formation mechanism this special interphase induced by revealed. could deliver an excellent high-temperature cycling stability with 90.8% retention 300 cycles half cell 95.6% 1000 pouch simultaneously enhances ∼51% thermal stability, which broadens approaches developing high-stable that work extreme environments.

Язык: Английский

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Achievable Surface–Bulk Structure Dual Reinforced by Room-Temperature Al-Induced Engineering Enables Stable Battery Cycling of 4.6 V LiCoO₂

ACS Applied Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 15, 2025

Язык: Английский

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In situ surface modification with solid-state reaction enabling long cycle performance of 4.5 V LiCoO2

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 164038 - 164038

Опубликована: Май 1, 2025

Язык: Английский

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One Stone for Multiple Birds: Copolymer with Multifunctional Groups Boosts the Cycling Stability of Lithium Cobalt Oxide Cathodes at 4.5 V

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер unknown

Опубликована: Дек. 18, 2024

High-voltage LiCoO

Язык: Английский

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