Suppressing intergranular cracking with near-surface layer regulation for electrochemical-thermal stabilization of LiCoO2 - Details

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To　further　meet　the　application　needs　of　lithium-ion　batteries,　developing　cathodes　with　higher　voltage　and　higher　operating　temperatures　has　become　a　primary　goal.　However,　LiCoO2　cathodes　encounter　structural　issues,　particle　fracture,　and　side　reactions　during　high-voltage　and　high-temperature　cycling.　Thus,　this　work　designs　a　novel　interface　engineering　approach　involving　near-surface　Li　layer　regulation　and　enhances　the　stability　of　the　R3̄m　layered　structure,　suppressing　intergranular　cracking.　An　undistorted　surface　with　reduced　phase　transitions　was　revealed　by　the　HAADF-STEM.　The　interface　regulation　by　post-cycle　simulations　and　XRD　stabilizes　interplanar　spacing.　The　strong　B-O　bonds　lower　the　O　2p　energies,　preventing　oxygen　loss　and　side　reactions　confirmed　by　XPS　and　band　structure.　Therefore,　even　under　50　°C,　the　half-cell　maintains　a　capacity　retention　rate　of　79%　after　200　cycles　at　5C　at　4.5　V.　©　2025　The　Royal　Society　of　Chemistry.

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[ 1 ] [Song K.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 2 ] [Shen Y.]Key Laboratory of Polar Materials and Devices, MOE, Shanghai Center of Brain-inspired Intelligent Materials and Devices, Department of Electronics, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, China
[ 3 ] [Xu T.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 4 ] [Lin Y.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 5 ] [Chen Z.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 6 ] [Zhang W.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 7 ] [He C.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 8 ] [Yang Z.]Key Laboratory of Polar Materials and Devices, MOE, Shanghai Center of Brain-inspired Intelligent Materials and Devices, Department of Electronics, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, China
[ 9 ] [Qu K.]Key Laboratory of Polar Materials and Devices, MOE, Shanghai Center of Brain-inspired Intelligent Materials and Devices, Department of Electronics, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, China
[ 10 ] [Liu Z.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 11 ] [Yu Y.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 12 ] [Yang C.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China

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Materials Horizons

ISSN： 2051-6347

Year： 2025

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JCR@2023

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