Electrochemical Self‐Assembly of Boron‐Based Cathode‐Electrolyte Interphase to Stabilize 4.65 V LiCoO₂

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 26, 2025

Abstract The cathode‐electrolyte interphase (CEI) is vital for the stability of LiCoO 2 (LCO) beyond 4.55 V (vs Li/Li + ). Herein, full coverage boron‐based CEI achieved on LCO surface via utilizing self‐wetting synthesis boric acid (i.e., B‐LCO), accompanying with subsequent electrochemical self‐assembly process upon cycles. Initially, B‐LCO coated borate deposits (size 10–20 nm), then it melts and fully covers sintering, leading to artificial CEI, which directly reduces side reactions induced by highly oxidative Co 4+ /O n− (0 < n 2). Significantly, during cycling, in situ interfacial between species LiF promote formation crystalline LiB 6 O 9 F components, showing mechanically robust Li conductive characteristics. Due synergism structurally tough rocksalt (RS) phase, not only more reversible phase transition uniform (de)lithiation are achieved, but also particle cracks deterioration issues effectively inhibited. As a result, B‐LCO||Li cells show excellent cycle stability, high retention 84.0% 500 cycles 3–4.65 V.

Language: Английский

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High-Entropy Approach vs. Traditional Doping Strategy for Layered Oxide Cathodes in Alkali-Metal-Ion Batteries: A Comparative Study

Energy storage materials, Journal Year: 2025, Volume and Issue: unknown, P. 104295 - 104295

Published: May 1, 2025

Language: Английский

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Unraveling Atomic-Level Mechanisms of Structural Transitions in Lithium Cobalt Oxide under High-Voltage Conditions

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 1, 2025

High-voltage cycling of layered cathode materials in lithium-ion batteries presents challenges related to structural instability. Deciphering atomic-scale degradation mechanisms is essential for improving their electrochemical performance at high voltages. This study utilized advanced electron microscopy and principal component analysis detect subtle spinel-like structure induced by the migration cobalt atoms within LiCoO2 subjected high-voltage charge voltages 4.6 4.8 V. The formation configuration was accompanied emergence a densified O1 phase beneath thin layer on (003) facets during charging, along with an intriguing local O3- P3-type oxygen stacking transition observed charged Upon discharge, enlarged defective spinel preferentially formed non-(003) facets, migrated cannot fully return original lattice sites, leading irreversible changes LiCoO2. Long-term revealed that initial extended underwent voltage-dependent evolution pathways, which contributed accelerated capacity fading cutoff voltage Our findings provide new insights into atomic-level transitions under conditions, offering guidance development more structurally robust applications.

Language: Английский

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Enabling Reversible O1 Phase Transition in 4.8 V‐Level LiCoO₂ Through Local Oxygen Coordination Engineering

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 24, 2025

Abstract Pushing LiCoO 2 (LCO) to a higher upper cut‐off voltage for charging is an effective way achieve energy density. However, this high‐voltage operation intensifies oxygen redox reactions and irreversible sliding of O–Co–O slabs, which result in structural collapse chemical instability LCO. Herein, local coordination optimization strategy proposed by introducing transition metal (TM)‐O‐TM configurations reversible O1 phase 4.8 V These are formed doping Ni, Fe, Al into the lattice, where Ni/Fe serves as pillars within Li layers, stabilizing deep de‐intercalation structure thus facilitating H1‐3/O1 at V. Additionally, environment alternation leads increased proportion high‐spin state Co 3+ , diminishing hybridization between 3d‐t 2g O 2p orbitals, thereby mitigating anion reactions. Consequently, lattice loss detrimental surface degradation inhibited, preventing increase battery polarization enhancing transformation. Ultimately, significantly mitigates accumulation internal stress prevents bulk failure during repeated (de)lithiation processes, capacity retention optimized LCO cathode ultrahigh

Language: Английский

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Co_0.1-NbSSe Anode for High-Performance Lithium-Ion Batteries: A Synergistic Approach of Defect Engineering and Ion Doping

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Language: Английский

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