Enhancing the Mn Redox Kinetics of LiMn_0.5Fe_0.5PO₄ Cathodes Through a Synergistic Co‐Doping with Niobium and Magnesium for Lithium‐Ion Batteries

Small, Journal Year: 2024, Volume and Issue: 20(47)

Published: Aug. 13, 2024

The concerns on the cost of lithium-ion batteries have created enormous interest LiFePO

Language: Английский

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High-energy, long-life Ni-rich cathode materials with columnar structures for all-solid-state batteries

Nature Energy, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Language: Английский

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Interface and Electrode Microstructure Engineering for Optimizing Performance of the LiNiO₂ Cathode in All-Solid-State Batteries

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(5), P. 2588 - 2598

Published: Feb. 28, 2024

Solid-state batteries (SSBs) utilizing superionic thiophosphate solid electrolytes (SEs), such as argyrodite Li6PS5Cl, are attracting great interest a potential solution for safe, high-energy-density electrochemical energy storage. However, the development of high-capacity cathodes remains major challenge. Herein, we present an effective design strategy to improve cyclability layered Co-free oxide cathode active material (CAM) LiNiO2, consisting surface modification and electrode microstructure engineering. After optimization, SSB cells were found deliver high capacities (qdis ≈ 200 mAh/gCAM) cycle stably hundreds hours. A combination operando ex situ characterization techniques was employed reveal mechanism optimization in overcoming several issues including poor SE compatibility, outgassing, state-of-charge heterogeneity. Tailoring composite increasing CAM|SE interface stability enable superior performance.

Language: Английский

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Ce doped UiO-66(Hf) electrolyte for all-solid-state lithium metal batteries

Applied Surface Science, Journal Year: 2024, Volume and Issue: 660, P. 159979 - 159979

Published: March 28, 2024

Language: Английский

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High structure stability and Li-conduction of LiNi_0.8Co_0.1Mn_0.1O₂ cathode co-coated by Al₂O₃ and LiNbO₃ for high performance lithium-ion battery

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We successfully fabricated NCM811 co-coated with Al 2 O 3 and LiNbO . enhances structural stability, while improves Li + ion conduction. This co-coating strategy electrochemical performance compared to single coating methods.

Language: Английский

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Unraveling the Degradation Mechanism of LiNbO3‐Coated NMC Cathode at High Potential in All‐Solid‐State Batteries Using 10 K Extended X‐ray Absorption Fine Structure Analysis

Batteries & Supercaps, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Abstract All solid‐state batteries (ASSBs) utilizing sulfide‐based solid electrolytes hold promise for enhancing battery energy density while mitigating safety concerns, thus meeting the stringent requirements electric vehicle applications. For practical application of ASSBs, it is important to stabilize interface between electrolyte and cathode. Although cathode coated with a thin layer LiNbO 3 provide higher stability, which significantly improves charge‐discharge cycle performance, degradation at high potentials has also been noted. In this study, we focused on mechanism ‐coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 active materials by using three electrode system allows separating impedance measurement electrolyte. We performed X‐ray absorption spectroscopy (XAS) measurements low temperature (10 K) analyze local structure around Nb correlate these findings measurements. Our results indicate that increased rapidly due oxygen desorption reaction potentials. This study aims elucidate dynamic changes in ASSBs new ideas design interfacial coating materials.

Language: Английский

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Surface modification of TiO2 coating over single crystalline NMC-83 cathode for Lithium-ion batteries

Journal of Physics and Chemistry of Solids, Journal Year: 2025, Volume and Issue: unknown, P. 112825 - 112825

Published: April 1, 2025

Language: Английский

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Protective Nanosheet Coatings for Thiophosphate‐Based All‐Solid‐State Batteries

Advanced Materials Interfaces, Journal Year: 2024, Volume and Issue: 11(14)

Published: March 13, 2024

Abstract Superionic sulfide solid electrolytes (SEs) are of considerable interest for application in solid‐state batteries, but suffer from limited stability. When combination with state‐of‐the‐art cathode active materials (CAMs), severe degradation at the CAM/SE interface occurs during electrochemical cycling. To improve upon interfacial stability, inert coatings can be applied to CAM particles, goal preventing direct contact SE. In this study, different methods depositing coatings, including hexagonal boron nitride, tungsten and exfoliated ((CH 3 (CH 2 ) 4 N) Nb 6 O 17 , form nanosheets onto free surface a Ni‐rich LiNi x Co y Mn z (NCM) examined compared one another. While dry coating is shown produce relatively uniform (good coverage), secondary particle morphology NCM makes ball milling as mechanical deposition method less attractive. contrast, dispersions organic solvents yields protective lower degree coverage. The electrochemically tested liquid‐ solid‐electrolyte‐based lithium‐ion batteries. A stabilizing effect nanosheet only observed cells lithium thiophosphate

Language: Английский

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Designing Hierarchical Assembly of Lanthanum-Doped TiNb₂O₇ for Single-Crystalline Cathodes: An Approach to Improving Cyclability at High Rates and Voltages

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 7(20), P. 9364 - 9381

Published: Oct. 18, 2024

Nickel-rich NMC cathodes are currently the most promising electrode materials for lithium-ion batteries (LIBs) because of their development and application perspectives. However, structural instabilities during electrochemical cycling, lattice oxygen loss, interfacial side reactions have been significant issues exacerbated at high voltages, compromising cyclic stability safety. Herein, we demonstrate a cost-effective wet chemical solution route to deposit thin TiNb2O7 (TN) Ti0.95La0.05Nb2O7 (TNL) shells on LiNi0.83Mn0.06Co0.11O2 (NMC-83) cathode study effect surface modification properties. X-ray diffraction electron microscopy verify that NMC-83 particles unaffected by thin-layer TN TNL coatings. Electrochemical tests indicated coating improved kinetics voltage 4.5 V. The 0.2 mol % TNL-coated discharged 141.88 mA h/g after 140 cycles 0.5C maintained 77.4% initial discharge capacity. By contrast, TN-coated pristine only 132.36 119.76 h/g, respectively, with capacity retention 72.7 63.2%. Even 2C, material retained 43.59% end 150 cycles. paves way next-generation LIBs providing stable, high-performance, high-capacity materials.

Language: Английский

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Eliminating chemo-mechanical degradation of lithium solid-state battery cathodes during >4.5 V cycling using amorphous Nb2O5 coatings

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Nov. 26, 2024

Abstract Lithium solid-state batteries offer improved safety and energy density. However, the limited stability of solid electrolytes (SEs), as well irreversible structural chemical changes in cathode active material, can result inferior electrochemical performance, particularly during high-voltage cycling (>4.3 V vs Li/Li + ). Therefore, new materials strategies are needed to stabilize cathode/SE interface preserve material structure cycling. Here, we introduce a thin (~5 nm) conformal coating amorphous Nb 2 O 5 on single-crystal LiNi 0.5 Mn 0.3 Co 0.2 particles using rotary-bed atomic layer deposition (ALD). Full cells with Li 4 Ti 12 anodes -coated cathodes demonstrate higher initial Coulombic efficiency 91.6% ± 0.5% compared 82.2% 0.3% for uncoated samples, along rate capability (10x accessible capacity at 2C rate) remarkable retention extended (99.4% after 500 cycles 4.7 These improvements associated reduced cell polarization interfacial impedance coated samples. Post-cycling electron microscopy analysis reveals that remains intact prevents formation spinel rock-salt phases, which eliminates intra-particle cracking material. findings potential pathway towards stable high-performance operation.

Language: Английский

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