Reviewing failure mechanisms and modification strategies in stabilizing high-voltage LiCoO2 cathodes beyond 4.55V

Energy storage materials, Год журнала: 2023, Номер 63, С. 103001 - 103001

Опубликована: Сен. 28, 2023

Язык: Английский

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Surface Engineering of Cathode Materials: Enhancing the High Performance of Lithium‐Ion Batteries

Small, Год журнала: 2024, Номер unknown

Опубликована: Июнь 6, 2024

Abstract The development and application of lithium‐ion batteries present a dual global prospect opportunity challenge. With conventional energy sources facing reserve shortages environmental issues, have emerged as transformative technology over the past decade, owing to their superior properties. They are poised for exponential growth in realms electric vehicles storage. cathode, vital component batteries, undergoes chemical electrochemical reactions at its surface that directly impact battery's density, lifespan, power output, safety. Despite increasing density cathodes commonly encounter surface‐side with electrolyte exhibit low conductivity, which hinder utility high‐power energy‐storage applications. Surface engineering has compelling strategy address these challenges. This paper meticulously examines principles progress cathode materials, providing insights into potential advancements charting trajectory practical implementation.

Язык: Английский

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Diffusion‐Optimized Long Lifespan 4.6 V LiCoO₂: Homogenizing Cycled Bulk‐To‐Surface Li Concentration with Reduced Structure Stress

Advanced Science, Год журнала: 2024, Номер 11(14)

Опубликована: Янв. 30, 2024

Abstract Increasing the charging cut‐off voltage (e.g., 4.6 V) to extract more Li ions are pushing LiCoO 2 (LCO) cathode achieve a higher energy density. However, an inhomogeneous cycled bulk‐to‐surface distribution, which is closely associated with enhanced extracted ions, usually ignored, and severely restricts design of long lifespan high LCO. Here, strategy by constructing artificial solid–solid diffusion environment on LCO's surface proposed homogeneous distribution upon cycling. The optimized LCO not only shows highly reversible capacity 212 mA h g −1 but also ultrahigh retention 80% over 600 cycles at V. Combined in situ X‐ray diffraction measurements stress‐evolution simulation analysis, it revealed that superior V long‐cycled stability ascribed reduced structure stress leaded diffusion. This work broadens approaches for stable layered oxide cathodes low ion‐storage stress.

Язык: Английский

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Scalable Precise Nanofilm Coating and Gradient Al Doping Enable Stable Battery Cycling of LiCoO₂ at 4.7 V

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(32)

Опубликована: Май 13, 2024

Abstract The quest for smart electronics with higher energy densities has intensified the development of high‐voltage LiCoO 2 (LCO). Despite their potential, LCO materials operating at 4.7 V faces critical challenges, including interface degradation and structural collapse. Herein, we propose a collective surface architecture through precise nanofilm coating doping that combines an ultra‐thin LiAlO layer gradient Al. This not only mitigates side reactions, but also improves Li + migration kinetics on surface. Meanwhile, Al inhibited severe lattice distortion caused by irreversible phase transition O3−H1−3−O1, thereby enhanced electrochemical stability during cycling. DFT calculations further revealed our approach significantly boosts electronic conductivity. As result, modified exhibited outstanding reversible capacity 230 mAh g −1 V, which is approximately 28 % than conventional 4.5 V. To demonstrate practical application, cathode structure shows improved in full pouch cell configuration under high voltage. excellent cycling stability, retaining 82.33 after 1000 cycles multifunctional modification strategy offers viable pathway application materials, setting new standard high‐energy‐density long‐lasting electrode materials.

Язык: Английский

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Advances and perspectives in understanding the structure-redox relationship of layered Li-Co-Ni-Mn oxide cathode materials

Progress in Materials Science, Год журнала: 2024, Номер 143, С. 101247 - 101247

Опубликована: Фев. 9, 2024

Язык: Английский

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Fucoidan Cross‐Linking Polyacrylamide as Multifunctional Aqueous Binder Stabilizes LiCoO₂ to 4.6 V

Advanced Functional Materials, Год журнала: 2024, Номер 34(40)

Опубликована: Июль 14, 2024

Abstract Raising the cutoff voltage can efficiently increase energy density of lithium cobalt oxide (LCO). However, upon charging over 4.55 V LCO undergoes irreversible phase transition from pristine O3 to metastable H1‐3 phases, causing serious side reactions, which results in poor cycling stability. Herein, a multifunctional aqueous composite binder derived cross‐linking fucoidan (FUC) and polyacrylamide (PAM) is developed enhance stability cathode at 4.6 V. The interaction FUC PAM provides uniform coating on surface ensures high peel strength for electrode, effectively mitigating detrimental interface reactions. More importantly, sulfur ester amide groups FUC‐PAM favorably function as charge compensators valent Co under voltages, thus stabilizes lattice suppresses oxygen release. As expected, with exhibits capacity retention 90% after 100 cycles current 110 mA g −1 . interfacial coordination effect binders offers novel strategy high‐voltage high‐energy lithium‐ion batteries.

Язык: Английский

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Surface Lattice Modulation Enables Stable Cycling of High‐Loading All‐solid‐state Batteries at High Voltages

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(16)

Опубликована: Фев. 21, 2024

Abstract Halide solid electrolytes, known for their high ionic conductivity at room temperature and good oxidative stability, face notable challenges in all–solid–state Li–ion batteries (ASSBs), especially with unstable cathode/solid electrolyte (SE) interface increasing interfacial resistance during cycling. In this work, we have developed an Al 3+ –doped, cation–disordered epitaxial nanolayer on the LiCoO 2 surface by reacting it artificially constructed AlPO 4 nanoshell; lithium–deficient layer featuring a rock–salt–like phase effectively suppresses decomposition of Li 3 InCl 6 stabilizes cathode/SE 4.5 V. The ASSBs halide high–loading cathode demonstrated discharge capacity long cycling life from to Our findings emphasize importance specialized modification preventing SE degradation achieving stable halide–based voltages.

Язык: Английский

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Boosting the electrochemical performance of LiCoO2 by triple-phase interface via “island-bridge” shaped surface coating

Chemical Engineering Journal, Год журнала: 2024, Номер 487, С. 150534 - 150534

Опубликована: Март 26, 2024

Язык: Английский

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Multiple Surface Optimizations for a Highly Durable LiCoO₂ beyond 4.6 V

Advanced Functional Materials, Год журнала: 2023, Номер 33(46)

Опубликована: Сен. 1, 2023

Abstract Recently, lots of researches have focused on enhancing the structure stability LiCoO 2 (LCO) at a cutoff voltage 4.6 V (vs Li/Li + ) room temperature. However, high temperature (≥45 °C) performances are more significant for practical applications. Herein, mechanism unsatisfactory LCO 45 °C via comparing commercial (C‐LCO) and surface optimized (O‐LCO) is revealed first. The deteriorated mainly due to two aspects: i) promoted bulk Li ion diffusion kinetics leads higher state charge charged LCO, which triggers side reactions; ii) prominent collapse blocks transport channels. Surface optimizations, including anions (F − PO 4 3− cations (Al 3+ modulation subsurface spinel reinforcement, comprehensively applied alleviate reaction issues O‐LCO, leading reversible discharge capacity 238 mAh g −1 , as well an obviously enhanced cycle floating beyond V. A new insight provided here developing advanced high‐voltage LCO.

Язык: Английский

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Surface-interspersed nanoparticles induced cathode-electrolyte interphase enabling stable cycling of high-voltage LiCoO2

Nano Energy, Год журнала: 2023, Номер 119, С. 109031 - 109031

Опубликована: Окт. 27, 2023

Язык: Английский

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