Elucidating the charge-transfer and Li-ion-migration mechanisms in commercial lithium-ion batteries with advanced electron microscopy

Deleted Journal, Год журнала: 2022, Номер 1, С. e9120031 - e9120031

Опубликована: Сен. 5, 2022

Understanding the charge-transfer and Li-ion-migration mechanisms in complex electrochemical environments is critical to improving performance of commercial lithium-ion batteries (LIBs). Advanced electron microscopy associated characterization techniques have significantly assisted clarifying structure–function relationships LIBs by providing localized nano/atomic-scale information concerning following aspects: atomic structures light/heavy elements, spatial distributions structural phase transitions, Li⁺ occupation, interfacial structures, occupation migration elemental distribution layer, concentration, space charge layer. Besides, development various in situ coupled with can enable comprehensive understanding evolution, growth lithium dendrites at anode, as well ion transport accumulation electrode–electrolyte interface during charging discharging. This review summarizes recent progress how advanced contributes elucidating key evolution LIBs. Emphasis placed on (1) discussions transition metal dissolution discharging LIB cathodes; (2) morphologies, compositions solid-electrolyte-interphase (SEI)/cathode– electrolyte-interface (CEI) films, along their influence battery performance; (3) effects crystal internal defects, structure transport. The lithiation delithiation processes are scrutinized, strategies for optimizing proposed. has been collated a deeper ion-migration LIBs, provide guidance performance.

Язык: Английский

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Native lattice strain induced structural earthquake in sodium layered oxide cathodes

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Янв. 27, 2022

High-voltage operation is essential for the energy and power densities of battery cathode materials, but its stabilization remains a universal challenge. To date, degradation origin has been mostly attributed to cycling-initiated structural deformation while effect native crystallographic defects induced during sophisticated synthesis process significantly overlooked. Here, using in situ synchrotron X-ray probes advanced transmission electron microscopy probe solid-state charge/discharge sodium layered oxide cathodes, we reveal that quenching-induced lattice strain plays an overwhelming role catastrophic capacity which runs counter conventional perception-phase transition interfacial reactions. We observe spontaneous relaxation responsible earthquake (e.g., dislocation, stacking faults fragmentation) cathodes cycling, unexpectedly not regulated by voltage window strongly coupled with temperature rate. Our findings resolve controversial understanding on materials highlight importance eliminating intrinsic guarantee superior cycling stability at high voltages.

Язык: Английский

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Advancing to 4.6 V Review and Prospect in Developing High‐Energy‐Density LiCoO₂ Cathode for Lithium‐Ion Batteries

Small Methods, Год журнала: 2022, Номер 6(5)

Опубликована: Март 24, 2022

Abstract Layered LiCoO 2 (LCO) is one of the most important cathodes for portable electronic products at present and in foreseeable future. It becomes a continuous push to increase cutoff voltage LCO so that higher capacity can be achieved, example, 220 mAh g –1 4.6 V compared 175 4.45 V, which unfortunately accompanied by severe degradation due much‐aggravated side reactions irreversible phase transitions. Accordingly, strict control on essential combat inherent instability related high challenge their future applications. This review begins with discussion relationship between crystal structures electrochemical properties as well failure mechanisms V. Then, recent advances strategies are summarized focus both bulk structure surface properties. One closes this presenting outlook efforts LCO‐based lithium ion batteries (LIBs). hoped work draw clear map research status LCO, also shed light directions materials design energy LIBs.

Язык: Английский

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Suppressing strain propagation in ultrahigh-Ni cathodes during fast charging via epitaxial entropy-assisted coating

Nature Energy, Год журнала: 2024, Номер 9(3), С. 345 - 356

Опубликована: Фев. 29, 2024

Язык: Английский

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Microstructures of layered Ni-rich cathodes for lithium-ion batteries

Chemical Society Reviews, Год журнала: 2024, Номер 53(9), С. 4707 - 4740

Опубликована: Янв. 1, 2024

The microstructural degradation, stabilization, and characterization of layered Ni-rich cathodes for Li-ion batteries are comprehensively reviewed in this paper.

Язык: Английский

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Achieving Thermodynamic Stability of Single‐Crystal Co‐Free Ni‐Rich Cathode Material for High Voltage Lithium‐Ion Batteries

Advanced Functional Materials, Год журнала: 2023, Номер 33(23)

Опубликована: Март 15, 2023

Abstract Ni‐rich layered cathode materials are progressively considered as the standard configuration of high‐energy electric vehicles by virtues their high capacity and eliminated “range anxiety.” However, poor cyclic stability severe cobalt supply crisis would restrain wide commercial applicability. Here, a cost‐effective single‐crystal Co‐free material LiNi 0.8 Mn 0.18 Fe 0.02 O 2 (NMF), which outperforms widely polycrystalline 0.83 Co 0.11 0.06 (MNCM) (SNCM) is reported. Surprisingly, NMF can compensate for reversible loss under designed conditions high‐temperature elevated‐voltage, achieving competitive energy density compared with conventional MNCM or SNCM. Combining operando characterizations functional theory calculation, it revealed that improved dynamic structure evolution largely alleviates mechanical strain issue commonly found in cathode, reduce formation intragranular cracks improve safety performance. Consequently, this new achieve perfect equilibrium between cost electrochemical performance, not only reduces production >15%, but also demonstrates excellent thermal cycling performance..

Язык: Английский

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Insights into the precursor specific surface area for engineering Co-free Ni-rich cathodes with tailorable properties

Chemical Engineering Journal, Год журнала: 2024, Номер 483, С. 149189 - 149189

Опубликована: Фев. 2, 2024

Язык: Английский

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Does trapped O₂ form in the bulk of LiNiO₂ during charging?

Energy & Environmental Science, Год журнала: 2024, Номер 17(7), С. 2530 - 2540

Опубликована: Янв. 1, 2024

The charge storage mechanism in LiNiO 2 Li-ion batteries is still under debate. Here, we show that trapped O forms during delithiation , accommodated by Ni vacancies, which form the layer.

Язык: Английский

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Unlocking Prussian Blue Analogues Inert‐Site to Achieve High‐Capacity Ammonium Storage

Advanced Functional Materials, Год журнала: 2024, Номер 34(29)

Опубликована: Фев. 27, 2024

Abstract Aqueous ammonium‐ion batteries (AIBs) are considered a promising alternative for large‐scale energy storage due to their cost‐effectiveness and high safety. Prussian blue analogues (PBAs) widely regarded as potential cathode materials AIBs because of working stable 3D framework. However, the low capacity PBAs (≈60 mAh g −1 in existing reported works) hinders further development. Herein, ion insertion is first proposed double by unlocking inert‐site. Using NH 4 + ‐rich copper hexacyanoferrate representative, trace amounts induced electrolyte can change electronic states atoms at inert site achieve much higher capacity. What's more, construction high‐entropy (N‐HEPBA) facilitates structural stability. N‐HEPBA unlocked corresponding ions exhibit an impressive specific (129 0.1 A ), which highest approximately twice that aqueous AIBs. Meanwhile, it delivers excellent cycling stability with nearly 100% retention achieved over 1000 cycles 2 . This innovative method provide effective way obtain high‐capacity AIBs, thus promoting development storage.

Язык: Английский

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Jahn–Teller Distortions and Phase Transitions in LiNiO₂: Insights from Ab Initio Molecular Dynamics and Variable-Temperature X-ray Diffraction

Chemistry of Materials, Год журнала: 2024, Номер 36(5), С. 2289 - 2303

Опубликована: Фев. 20, 2024

The atomistic structure of lithium nickelate (LiNiO2), the parent compound Ni-rich layered oxide cathodes for Li-ion batteries, continues to elude a comprehensive understanding. common consensus is that material exhibits local Jahn–Teller distortions dynamically reorient, resulting in time-averaged undistorted R3̅m structure. Through combination ab initio molecular dynamics (AIMD) simulations and variable-temperature X-ray diffraction (VT-XRD), we explore LiNiO2 as function temperature. Static are observed at low temperatures (T < 250 K) via AIMD simulations, followed by broad phase transition occurs between 350 K, leading highly dynamic, displacive high > K), which does not show four short two long bonds characteristic distortions. These transitions abrupt changes calculated pair distribution bond-length distortion index monoclinic lattice parameter ratio, amon/bmon, δ angle, fit quality an R3̅m-based structural refinement, peak sharpening peaks on heating, consistent with loss distorted domains. Between mixed-phase regime found where domains coexist. repeated change states this allows axes direction. pseudorotations Ni–O side effect onset transition. Antisite defects, involving Li ions Ni layer layer, pin temperatures, impeding cooperative ordering longer length scale.

Язык: Английский

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