Investigation and Suppression of Oxygen Release by LiNi0.8Co0.1Mn0.1O2 Cathode under Overcharge Conditions DOI
Chen‐Guang Shi, Xinxing Peng, Peng Dai

и другие.

Advanced Energy Materials, Год журнала: 2022, Номер 12(20)

Опубликована: Апрель 10, 2022

Abstract The safety issue of lithium‐ion batteries is a crucial factor limiting their large‐scale application. Therefore, it practical significance to evaluate the impact overcharge behavior because severe levels oxygen release cathode materials during this process. Herein, by combining variety in situ techniques spectroscopy and electron microscopy, work studies structural degradation LiNi 0.8 Co 0.1 Mn O 2 (NCM811) accompanying It observed that small amount evolves from initial surface at ≈4.7 V. When charging higher voltage (≈5.5 V), large on newly formed due occurrence microcracks. Based experimental results theoretical calculations, determined mainly occurs near‐surface regions, where remaining vacancies accumulate create voids. To suppress release, single‐crystalline NCM811 with integrated structure introduced serves as cathode, which can effectively inhibit morphology destruction reduce activation lattice region. These findings provide basis effective strategy for improving performance Ni‐rich applications.

Язык: Английский

Computational understanding and multiscale simulation of secondary batteries DOI
Yan Yuan, Bin Wang, Jinhao Zhang

и другие.

Energy storage materials, Год журнала: 2025, Номер unknown, С. 104009 - 104009

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

2
W/Mg dual-site doping triggering high Ni migration barrier and rock-salt passivation layer for long-cycle and thermal stable ultrahigh-nickel cathode material LiNi0.9Co0.1O2 DOI

Afei Li,

Chengzhi Hu, Guoxian Wang

и другие.

Journal of Power Sources, Год журнала: 2025, Номер 635, С. 236506 - 236506

Опубликована: Фев. 16, 2025

Язык: Английский

Процитировано

2
Regulation of Surface Defect Chemistry toward Stable Ni‐Rich Cathodes DOI Creative Commons
Liguang Wang, Xincheng Lei,

Tongchao Liu

и другие.

Advanced Materials, Год журнала: 2022, Номер 34(19)

Опубликована: Март 11, 2022

Surface reconstruction of Ni-rich layered oxides (NLO) degrades the cycling stability and safety high-energy-density lithium-ion batteries (LIBs), which challenges typical surface-modification approaches to build a robust interface with electrochemical activity. Here, strategy leveraging low-strain analogues Li- Mn-rich (LMR) reconstruct stable surface on cathodes is proposed. The new structure not only consists gradient chemical composition but also contains defect-rich regarding formation oxygen vacancies cationic ordering, can simultaneously facilitate lithium diffusion stabilize crystal during (de)lithiation. These features in NLO lead dramatic improvement properties, especially cyclability under high voltage cycling, exhibiting 30% increase capacity retention after 200 cycles at current density 1 C (3.0-4.6 V). findings offer facile effective way regulate defect chemistry parallel achieve high-energy LIBs.

Язык: Английский

Процитировано

67
Operando visualization of kinetically induced lithium heterogeneities in single-particle layered Ni-rich cathodes DOI Creative Commons
Chao Xu, Alice J. Merryweather, Shrinidhi S. Pandurangi

и другие.

Joule, Год журнала: 2022, Номер 6(11), С. 2535 - 2546

Опубликована: Окт. 12, 2022

Understanding how lithium-ion dynamics affect the (de)lithiation mechanisms of state-of-the-art nickel-rich layered oxide cathodes is crucial to improve electrochemical performance. Here, we directly observe two distinct kinetically induced lithium heterogeneities within single-crystal LiNixMnyCo(1−x−y)O2 (NMC) particles using recently developed operando optical microscopy, challenging notion that uniform occurs individual particles. Upon delithiation, a rapid increase in diffusivity at beginning charge results with lithium-poor peripheries and lithium-rich cores. The slow ion diffusion near-full lithiation states—and transfer kinetics—also leads heterogeneity end discharge, surface preventing complete lithiation. Finite-element modeling confirms concentration-dependent necessary reproduce these phenomena. Our demonstrate kinetic limitations cause significant first-cycle capacity losses Ni-rich cathodes.

Язык: Английский

Процитировано

66
Investigation and Suppression of Oxygen Release by LiNi0.8Co0.1Mn0.1O2 Cathode under Overcharge Conditions DOI
Chen‐Guang Shi, Xinxing Peng, Peng Dai

и другие.

Advanced Energy Materials, Год журнала: 2022, Номер 12(20)

Опубликована: Апрель 10, 2022

Abstract The safety issue of lithium‐ion batteries is a crucial factor limiting their large‐scale application. Therefore, it practical significance to evaluate the impact overcharge behavior because severe levels oxygen release cathode materials during this process. Herein, by combining variety in situ techniques spectroscopy and electron microscopy, work studies structural degradation LiNi 0.8 Co 0.1 Mn O 2 (NCM811) accompanying It observed that small amount evolves from initial surface at ≈4.7 V. When charging higher voltage (≈5.5 V), large on newly formed due occurrence microcracks. Based experimental results theoretical calculations, determined mainly occurs near‐surface regions, where remaining vacancies accumulate create voids. To suppress release, single‐crystalline NCM811 with integrated structure introduced serves as cathode, which can effectively inhibit morphology destruction reduce activation lattice region. These findings provide basis effective strategy for improving performance Ni‐rich applications.

Язык: Английский

Процитировано

64