Low-temperature piezoelectric/ferroelectric coating layer driving lithium-ion rapid diffusion and structure stability of LiCoO2 cathode

Journal of Electroanalytical Chemistry, Journal Year: 2025, Volume and Issue: unknown, P. 118929 - 118929

Published: Jan. 1, 2025

Language: Английский

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Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 3, 2024

Abstract Elevating the charging cut‐off voltage is an effective strategy to increase energy density of LiCoO 2 . However, unstable interfacial structures and unfavorable phase transitions in bulk are inevitably triggered during deep de‐lithiation at high voltage. Herein, integrated surface‐to‐bulk Ti‐modification applied , enabling uniform Li TiO 3 coating on surface gradient Ti‐doping toward structural bulk. The resultant Ti‐modified (T‐LCO) electrode can be stably cycled up 4.6 V, providing a high‐rate capability 137 mAh g −1 5C long‐life stability with 80.5% capacity retention after 400 cycles 1C, far outperforming unmodified only 50.7% retention. In situ X‐ray diffraction characterization functional theory calculation reveal that synergistic modification T‐LCO enhances + diffusion, facilitates construction high‐quality cathode/electrolyte interphase, reduces transition from O3 H1‐3 Co3d/O2p band overlap, restrains layer‐to‐spinel distortion, thus improving V. This work presents “two birds one step” enhance cycling achievable high‐voltage for developing lithium‐ion batteries.

Language: Английский

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Comprehensive Crystal Structural Insights into Phase Evolution of Spinel Co-Free Lithium Nickel Manganese Oxide

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1892 - 1910

Published: March 26, 2025

High-voltage Co-free LiNi0.5Mn1.5O4 (LNMO) is considered a promising candidate for next-generation high-performance lithium-ion batteries. However, there significant absence of full understanding elaborate evolution crystal structures. This review article aims to thoroughly examine the latest advancements in state-of-the-art LNMO and establish systematic framework that outlines varied phase mechanisms under different synthesis conditions during cycling from perspective structure. First, an analysis intrinsic structural properties conducted optimizing process, including orientation, oxygen deficiency, disorder–order transition, surface reconstruction various conditions. Then, transformation have been systematically elucidated develop strategies mitigate any detrimental effects improve electrochemical performance. Finally, insights into further development directions are offered at relevant length scales structure level electrode level.

Language: Английский

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Research progress on cathode materials for lithium-ion batteries

Journal of Solid State Electrochemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

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