Cation mixing regulation of cobalt-free high-nickel layered cathodes enables stable and high-rate lithium-ion batteries

Nano Energy, Год журнала: 2024, Номер 123, С. 109410 - 109410

Опубликована: Фев. 20, 2024

Язык: Английский

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Spheroidization: The Impact of Precursor Morphology on Solid‐State Lithiation Process for High‐Quality Ultrahigh‐Nickel Oxide Cathodes

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(34)

Опубликована: Июнь 7, 2024

Abstract Layered oxides with ultrahigh nickel content are considered promising high energy cathode materials. However, their cycle stability is constrained by a series of heterogeneous structural transformations during the complex solid‐state lithiation process. By in‐depth investigation into process LiNi 0.92 Co 0.04 Mn O 2 , it found that protruded parts on surface precursor particles tend to be surrounded locally excessive LiOH, which promotes formation rigid and dense shell early stage The will hinder diffusion lithium topotactic within particles, culminating in spatially intermediates can impair electrochemical properties material. spheroidization enhance uniformity evolution solid‐phase lithiation. Ultrahigh cathodes derived from spherical precursors demonstrate initial discharge specific capacity (234.2 mAh g −1 range 2.7–4.3 V) retention (89.3 % after 200 cycles), significantly superior non‐spherical samples. This study not only sheds light intricate relationship between shape transformation but also introduces novel strategy for enhancing performance through spheroidization.

Язык: Английский

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Exploring the mechanism of surface cationic vacancy induced high activity of metastable lattice oxygen in Li‐ and Mn‐rich cathode materials

Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown

Опубликована: Фев. 1, 2025

Li- and Mn-rich layered oxides exhibit high specific capacity due to the cationic anionic reaction process during high-voltage cycling (≥4.6 V). However, they face challenges such as low initial coulombic efficiency (~70 %) poor stability. Here, we propose a combination of H3BO3 treatment temperature calcination construct shell with vacancy on surface Li1.2Ni0.2Mn0.6O2 (LLNMO). The produces lattice distortion, forming an oxidized On- (0

Язык: Английский

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Asynchronous domain dynamics and equilibration in layered oxide battery cathode

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Дек. 18, 2023

To improve lithium-ion battery technology, it is essential to probe and comprehend the microscopic dynamic processes that occur in a real-world composite electrode under operating conditions. The primary secondary particles are structural building blocks of cathode electrodes. Their inconsistency has profound but not well-understood impacts. In this research, we combine operando coherent multi-crystal diffraction optical microscopy examine chemical dynamics local domains layered oxide cathode. Our results only pinpoint asynchronicity lithium (de)intercalation at sub-particle level, also reveal sophisticated diffusion kinetics reaction patterns, involving various localized processes, e.g., onset, front propagation, equilibration, particle deformation motion. These observations shed new lights onto activation degradation mechanisms state-of-the-art materials.

Язык: Английский

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Regulating the internal structure by magnesium doping to enhance cycle stability of full-concentration-gradient Ni-rich layered cathodes

Chemical Engineering Journal, Год журнала: 2023, Номер 474, С. 145554 - 145554

Опубликована: Авг. 26, 2023

Язык: Английский

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