Precision engineering of high-performance Ni-rich layered cathodes with radially aligned microstructure through architectural regulation of precursors

eScience, Год журнала: 2024, Номер unknown, С. 100276 - 100276

Опубликована: Май 1, 2024

Microstructure engineering serves as a potent approach to counteract the mechanical deterioration of Ni-rich layered cathodes, stemming from anisotropic strain during Li+ (de)intercalation. However, pressing challenge persists in devising direct method for fabricating radially aligned cathodes utilizing oriented hydroxide precursors. In this study, we synthesized LiNi0.92Co0.04Mn0.04O2 oxides boasting superior aligned, size-refined primary particles through combination strategic precipitation regulation and lithiation tuning. Elongated particles, achieved by stepwise control ammonia concentration pH particle growth, facilitate formation precursor particles. Leveraging our prepared cathode exhibits high discharge capacity 229 mAh g−1 at 0.05 C, alongside excellent cycle stability, retaining 93.3% after 200 cycles 0.5 C (30 °C) half cell, 86.4% 1000 1 full cell. Revisiting oxide underscores significance controlling maximize size perpendicular [001] attain suitable along high-temperature calcination, offering valuable insights synthesizing high-performance cathodes.

Язык: Английский

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Mechanism Behind the Loss of Fast Charging Capability in Nickel‐Rich Cathode Materials

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(12)

Опубликована: Янв. 31, 2024

Fast charging technology for electric vehicles (EVs), offering rapid times similar to conventional vehicle refueling, holds promise but faces obstacles owing kinetic issues within lithium-ion batteries (LIBs). Specifically, the significance of cathode materials in fast has grown because Ni-rich cathodes are employed enhance energy density LIBs. Herein, mechanism behind loss capability during extended cycling is investigated through a comparative analysis with different microstructures. The results revealed that microcracks and resultant deterioration significantly compromised over cycling. When thick rocksalt impurity phases form throughout particles electrolyte infiltration via microcracks, limited kinetics Li

Язык: Английский

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Precise Regulation of Particle Orientation for Ni-Rich Cathodes with Ultra-Long Cycle Life

Nano Energy, Год журнала: 2024, Номер 129, С. 110008 - 110008

Опубликована: Июль 15, 2024

Язык: Английский

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Uncovering mechanism behind tungsten bulk/grain-boundary modification of Ni-rich cathode

Energy storage materials, Год журнала: 2025, Номер 75, С. 104016 - 104016

Опубликована: Янв. 7, 2025

Язык: Английский

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Unraveling 3d Transition Metal (Ni, Co, Mn, Fe, Cr, V) Ions Migration in Layered Oxide Cathodes: A Pathway to Superior Li‐Ion and Na‐Ion Battery Cathodes

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Abstract Li‐ion and Na‐ion batteries are promising systems for powering electric vehicles grid storage. Layered 3d transition metal oxides A x TMO 2 (A = Li, Na; TM metals; 0 < ≤ 2) have drawn extensive attention as cathode materials due to their exceptional energy densities. However, they suffer from several technical challenges caused by crystal structure degradation associated with ions migration, such poor cycling stability, inferior rate capability, significant voltage hysteresis, serious decay. Aiming tackle these challenges, this review provides an in‐depth discussion comprehensive understanding of the migration behaviors in . First, key thermodynamics kinetics that impact discussed, covering ionic radius, electronic configuration, arrangement, barrier. In particular, details provided regarding universal specific characteristics Ni, Co, Mn, Fe, Cr, V layered materials. Subsequently, impacts migrations on electrochemical performance emphasized terms fundamental science behind issues, strategies modulate advanced development summarized. Besides, characterization techniques probing present, like neutron diffraction (ND), scanning transmission electron microscopy (STEM), nuclear magnetic resonance (NMR), others. Finally, future directions regard comprehensively concluded. This offers valuable insights into basic design oxide batteries.

Язык: Английский

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One‐Step Surface‐to‐Bulk Modification of High‐Voltage and Long‐Life LiCoO₂ Cathode with Concentration Gradient Architecture

Advanced Materials, Год журнала: 2023, Номер 36(1)

Опубликована: Ноя. 13, 2023

Abstract Raising the charging cut‐off voltage of layered oxide cathodes can improve their energy density. However, it inevitably introduces instabilities regarding both bulk structure and surface/interface. Herein, exploiting unique characteristics high‐valence Nb 5+ element, a synchronous surface‐to‐bulk‐modified LiCoO 2 featuring Li 3 NbO 4 surface coating layer, Nb‐doped bulk, desired concentration gradient architecture through one‐step calcination is achieved. Such multifunctional facilitates construction high‐quality cathode/electrolyte interface, enhances + diffusion, restrains lattice‐O loss, Co migration, associated layer‐to‐spinel phase distortion. Therefore, stable operation Nb‐modified half‐cell achieved at 4.6 V (90.9% capacity retention after 200 cycles). Long‐life 250 Wh kg −1 4.7 V‐class 550 pouch cells assembled with graphite thin anodes are harvested (both beyond 87% 1600 This modification strategy establishes technological paradigm to pave way for high‐energy density long‐life lithium‐ion cathode materials.

Язык: Английский

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Air-Stable High-Entropy Layered Oxide Cathode with Enhanced Cycling Stability for Sodium-Ion Batteries

Nano Letters, Год журнала: 2024, Номер 24(32), С. 9793 - 9800

Опубликована: Авг. 1, 2024

O3-type layered oxides have been extensively studied as cathode materials for sodium-ion batteries due to their high reversible capacity and initial sodium content, but they suffer from complex phase transitions an unstable structure during intercalation/deintercalation. Herein, we synthesize a high-entropy transition metal oxide, NaNi0.3Cu0.05Fe0.1Mn0.3Mg0.05Ti0.2O2 (NCFMMT), by simultaneously doping Cu, Mg, Ti into its layers, which greatly increase structural entropy, thereby reducing formation energy enhancing stability. The NCFMMT exhibits significantly improved cycling stability (capacity retention of 81.4% at 1C after 250 cycles 86.8% 5C 500 cycles) compared pristine NaNi0.3Fe0.4Mn0.3O2 (71% 100 1C), well remarkable air Finally, the NCFMMT//hard carbon full-cell deliver 103 mAh g–1 1C, with 83.8 maintained 300 81.4%).

Язык: Английский

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Inhibiting phase conversion and improving cyclic stability of Ni-rich layered oxide by high-valence element concentration gradient doping

Chemical Engineering Journal, Год журнала: 2024, Номер 485, С. 149827 - 149827

Опубликована: Фев. 21, 2024

Язык: Английский

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Surface reactivity versus microcracks in Ni-rich layered oxide cathodes: Which is critical for long cycle life？

Chemical Engineering Journal, Год журнала: 2024, Номер 488, С. 150795 - 150795

Опубликована: Март 28, 2024

Язык: Английский

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Two birds with one stone: One-pot concurrent Ta-doping and -coating on Ni-rich LiNi0.92Co0.04Mn0.04O2 cathode materials with fiber-type microstructure and Li+-conducting layer formation

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 661, С. 289 - 306

Опубликована: Янв. 18, 2024

Язык: Английский

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