Thermal Stability and Outgassing Behaviors of High‐nickel Cathodes in Lithium‐ion Batteries

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(43)

Опубликована: Июнь 9, 2023

Abstract LiNiO 2 ‐based high‐nickel layered oxide cathodes are regarded as promising cathode materials for high‐energy‐density automotive lithium batteries. Most of the attention thus far has been paid towards addressing their surface and structural instability issues brought by increase Ni content (>90 %) with an aim to enhance cycle stability. However, poor safety performance remains intractable problem commercialization in market, yet it not received appropriate attention. In this review, we focus on gas generation thermal degradation behaviors high‐Ni cathodes, which critical factors determining overall performance. A comprehensive overview mechanisms outgassing runaway reactions is presented analyzed from a chemistry perspective. Finally, discuss challenges insights into developing robust, safe cathodes.

Язык: Английский

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Electronic structure formed by Y2O3-doping in lithium position assists improvement of charging-voltage for high-nickel cathodes

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Янв. 2, 2025

High-capacity power battery can be attained through the elevation of cut-off voltage for LiNi0.83Co0.12Mn0.05O2 high-nickel material. Nevertheless, unstable lattice oxygen would released during lithium deep extraction. To solve above issues, electronic structure is reconstructed by substituting Li+ ions with Y3+ ions. The dopant within Li layer could transfer electrons to adjacent oxygen. Subsequently, accumulated in site are transferred nickel highly valence state under action reduction coupling mechanism. modified strategy suppresses generation defects regulating local structure, but more importantly, it reduces concentration reactive Ni4+ species charging state, thus avoiding evolution an unexpected phase transition. Strengthening strength between layers and transition metal finally realizes fast-charging performance improvement cycling stability enhancement high voltage. Authors report on restructuring a material This mechanism improving high-voltage stability.

Язык: Английский

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Design of functional binders for high-specific-energy lithium-ion batteries: from molecular structure to electrode properties

Industrial Chemistry and Materials, Год журнала: 2023, Номер 2(2), С. 191 - 225

Опубликована: Сен. 29, 2023

This review systematically summarizes the research progress of functional binders in lithium-ion batteries and elucidates main functions advanced to deal with challenges high-specific-energy electrodes.

Язык: Английский

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Localized High‐Concentration Electrolytes with Low‐Cost Diluents Compatible with Both Cobalt‐Free LiNiO₂ Cathode and Lithium‐Metal Anode

Small, Год журнала: 2023, Номер 19(49)

Опубликована: Авг. 11, 2023

Abstract High‐nickel layered oxide cathodes and lithium‐metal anode are promising candidates for next‐generation battery systems due to their high energy density. Nevertheless, the instability of electrode–electrolyte interphase is hindering practical application. Localized high‐concentration electrolytes (LHCEs) present a solution achieving uniform lithium deposition stable cathode–electrolyte interphase. However, limited choice diluents cost restricting implementation. Four novel cost‐effective performance with highly reactive LiNiO 2 cathode Li‐metal reported here. The results show that all LHCE cells exhibit Coulombic efficiency >99.38% in Li | Cu capacity retention >85% after 250 cycles. Advanced characterizations unveil cell operation well‐tuned interphases morphology. In addition, online electrochemical mass spectroscopy differential scanning calorimetry reveal gas generation heat‐release greatly reduced LHCEs presented. Overall, study provides new insights into role offers valuable guidance further optimization density batteries.

Язык: Английский

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Lithium Tritelluride as an Electrolyte Additive for Stabilizing Lithium Deposition and Enhancing Sulfur Utilization in Anode‐Free Lithium–Sulfur Batteries

Advanced Functional Materials, Год журнала: 2023, Номер 33(43)

Опубликована: Июнь 24, 2023

Abstract Despite the potential to become next‐generation energy storage technology, practical lithium–sulfur (Li–S) batteries are still plagued by poor cyclability of lithium‐metal anode and sluggish conversion kinetics S species. In this study, lithium tritelluride (LiTe 3 ), synthesized with a simple one‐step process, is introduced as novel electrolyte additive for Li–S batteries. LiTe quickly reacts polysulfides functions redox mediator greatly improve cathode utilization active materials in cathode. Moreover, formation Li 2 TeS /Li Te‐enriched interphase layer on surface enhances ionic transport stabilizes deposition. By regulating chemistry both sides, enables stable operation anode‐free only 0.1 m concentration conventional ether‐based electrolytes. The cell retains 71% initial capacity after 100 cycles, while control 23%. More importantly, high Te, significantly better pouch full‐cells under lean conditions.

Язык: Английский

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Polymeric Binder Design for Sustainable Lithium-Ion Battery Chemistry

Polymers, Год журнала: 2024, Номер 16(2), С. 254 - 254

Опубликована: Янв. 16, 2024

The design of binders plays a pivotal role in achieving enduring high power lithium-ion batteries (LIBs) and extending their overall lifespan. This review underscores the indispensable characteristics that binder must possess when utilized LIBs, considering factors such as electrochemical, thermal, dispersion stability, compatibility with electrolytes, solubility solvents, mechanical properties, conductivity. In case anode materials, robust properties elasticity are imperative to uphold electrode integrity, particularly materials subjected substantial volume changes. For cathode selection hinges on crystal structure material. Other vital considerations encompass cost effectiveness, adhesion, processability, environmental friendliness. Incorporating low-cost, eco-friendly, biodegradable polymers can significantly contribute sustainable battery development. serves an invaluable resource for comprehending prerequisites high-performance LIBs offers insights into diverse materials. findings principles articulated this be extrapolated other advanced systems, charting course developing next-generation characterized by enhanced performance sustainability.

Язык: Английский

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Covalent organic frameworks-based functional separators for rechargeable batteries: Design, mechanism, and applications

Energy storage materials, Год журнала: 2024, Номер 66, С. 103232 - 103232

Опубликована: Янв. 28, 2024

Язык: Английский

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Enhancing Mechanical Resilience in Li-Ion Battery Cathodes with Nanoscale Elastic Framework Coatings

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Янв. 3, 2025

Lattice volume changes in Li-ion batteries active materials are unavoidable during electrochemical cycling, posing significant engineering challenges from the particle to electrode level. In this study, we present an elastic framework coating designed absorb and reversibly release strain energy associated with changes, thereby enhancing mechanical resilience at both levels. This framework, composed of multiwalled carbon nanotubes (MWCNTs), is applied nickel-rich LiNi

Язык: Английский

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High-Mass-Loading Anode-Free Lithium–Sulfur Batteries Enabled by a Binary Binder with Fast Lithium-Ion Transport

ACS Energy Letters, Год журнала: 2023, Номер 8(9), С. 3767 - 3774

Опубликована: Авг. 14, 2023

To realize the practical viability of lithium–sulfur batteries (LSBs), it is crucial to develop advanced electrode materials that enable high-mass-loading cells with limited lithium and a lean electrolyte. We present here design binary binder by combining poly(ethylene oxide) (PEO) cross-linked quadripolymer, which exhibits high mechanical strength electrochemical stability. The tightly interwoven network enhances structural reliability PEO in ether-based electrolytes resilience accommodate volume changes during cycling. Moreover, anode–electrolyte interfacial chemistry sulfur redox kinetics are ameliorated this due its strong polysulfide adsorbability multiple lithium-ion transport channels matrix quadripolymer skeleton. With binder, anode-free full Li2S loading 5.4 mg cm–2 low electrolyte/sulfur ratio 7 μL mg–1 display significantly improved capacity retention 79% after 100 cycles.

Язык: Английский

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Implanting Transition Metal into Li₂O‐Based Cathode Prelithiation Agent for High‐Energy‐Density and Long‐Life Li‐Ion Batteries

Angewandte Chemie International Edition, Год журнала: 2023, Номер 63(5)

Опубликована: Дек. 13, 2023

Abstract Compensating the irreversible loss of limited active lithium (Li) is essentially important for improving energy‐density and cycle‐life practical Li‐ion battery full‐cell, especially after employing high‐capacity but low initial coulombic efficiency anode candidates. Introducing prelithiation agent can provide additional Li source such compensation. Herein, we precisely implant trace Co (extracted from transition metal oxide) into site 2 O, obtaining (Li 0.66 0.11 □ 0.23 ) O (CLO) cathode agent. The synergistic formation vacancies Co‐derived catalysis efficiently enhance inherent conductivity weaken Li−O interaction which facilitates its anionic oxidation to peroxo/superoxo species gaseous , achieving 1642.7 mAh/g ~Li2O capacity (≈980 agent). Coupled 6.5 wt % CLO‐based with LiCoO cathode, substantial stored within CLO released compensate consumption on SiO/C anode, 270 Wh/kg pouch‐type full‐cell 92 retention 1000 cycles.

Язык: Английский

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