High-voltage LiCoO2 achieved by one-step in situ formed fast Li-ion and electron mixed conductor coating layer

Journal of Energy Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Дек. 1, 2024

Язык: Английский

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Construction of Uniform LiF Coating Layers for Stable High-Voltage LiCoO2 Cathodes in Lithium-Ion Batteries

Molecules, Год журнала: 2024, Номер 29(6), С. 1414 - 1414

Опубликована: Март 21, 2024

Stabilizing LiCoO2 (LCO) at 4.5 V rather than the common 4.2 is important for high specific capacity. In this study, we developed a simple and efficient way to improve stability of voltages. After sol–gel method, introduced trifluoroacetic acid (TA) surface LCO via an afterwards calcination. Meanwhile, TA reacted with residual lithium on LCO, further leading formation uniform LiF nanoshells. The nanoshells could effectively restrict interfacial side reaction, hinder transition metal dissolution thus achieve stable cathode–electrolyte interface working-voltages. As result, LCO@LiF demonstrated much superior cycling capacity retention ratio 83.54% after 100 cycles compared bare ones (43.3% retention), as well rate performances. Notably, coating layers endow excellent high-temperature performances outstanding full-cell This work provides effective prepare materials working voltage.

Язык: Английский

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Long-cycle Lithium batteries with LiNi_0.8Co_0.1Mn_0.1O₂ cathodes above 4.5 V enabled by uniform coating of nanosized garnet electrolytes

Chinese Physics Letters, Год журнала: 2024, Номер 41(7), С. 078201 - 078201

Опубликована: Июнь 7, 2024

Abstract The pursuit of high-energy cathode materials has been focused on raising the charging cutoff voltage nickel (Ni)-rich layered oxide such as LiNi 0.8 Co 0.1 Mn O 2 (NCM811). However, NCM811 suffers from rapid capacity fading upon cycling at higher than 4.5 V, owing to their structural degradation and labile surface reactivity. Surface-coating with solid electrolytes recognized an effective method mitigate performance failure high voltage. Herein, nano-sized Li 6.4 La 3 Ta 0.6 Zr 1.4 12 (LLZTO) is uniformly coated single-crystal particles, accompanied long-range 5+ diffusion into transition metal layer lattice. It revealed that LLZTO coating can not only inhibit reactions liquid but also play important role in suppressing bulk microcracking within particles. incorporation ion expands lattice spacing thereby improves homogeneity + NCM811, which alleviates mechanical strain intragranular cracks caused by nonuniform phases-transformation synergy protection stabilization realized enables NCM811-based lithium batteries achieve a remarkable electrochemical performance. Typically, delivers reversible specific 202.1 mAh⋅g −1 excellent retention 70% over 1000 cycles V 1 C.

Язык: Английский

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A Dual-Functional Synergetic Strategy Enhances the Interfacial and Structural Stability of LiCoO₂ at High Voltage

ACS Applied Energy Materials, Год журнала: 2024, Номер 7(15), С. 6585 - 6597

Опубликована: Июль 25, 2024

With the advent of 5G era, widespread application various smart devices and cutting-edge technologies has imposed stringent requirements on battery lifespan durability. This study proposes a synergistic modification strategy combining Mg2+ Y3+ dual doping with Li3PO4 coating. Herein, exhibits gradient distribution near surface uniform inside, enhancing electronic conductivity while facilitating penetration Y element into particle interior. What is more, addition significantly widens Li+ transmission channels, greatly rapid charge–discharge performance. The interaction stabilizes internal structure, coating serves to effectively block direct between electrolyte cathode surface, stabilizing structure improving long-term cycling findings indicate that approach adjusts Co 3d O 2p energy bands, suppressing hybridization phenomenon orbitals. Remarkably, proposed maintains superb capacity retention rate nearly 80% after 300 cycles at 4.6 V, it an excellent reversible 109.6 mAh·g–1 even 10 C, thus demonstrating superior overall performance vast potential this approach.

Язык: Английский

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Integrated optimization design with inherent element behaviors for bulk and surface stability towards 4.7 V LiCoO2 cathode

Nano Energy, Год журнала: 2024, Номер unknown, С. 110496 - 110496

Опубликована: Ноя. 1, 2024

Язык: Английский

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