Toward the High‐Voltage Stability of Layered Oxide Cathodes for Sodium‐Ion Batteries: Challenges, Progress, and Perspectives

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(26)

Published: March 21, 2024

Sodium-ion batteries (SIBs) have garnered significant attention as ideal candidates for large-scale energy storage due to their notable advantages in terms of resource availability and cost-effectiveness. However, there remains a substantial density gap between SIBs commercially available lithium-ion (LIBs), posing challenges meeting the requirements practical applications. The fabrication high-energy cathodes has emerged an efficient approach enhancing SIBs, which commonly requires operating high-voltage regions. Layered oxide (LOCs), with low cost, facile synthesis, high theoretical specific capacity, one most promising commercial LOCs encounter when operated regions such irreversible phase transitions, migration dissolution metal cations, loss reactive oxygen, occurrence serious interfacial parasitic reactions. These issues ultimately result severe degradation battery performance. This review aims shed light on key failure mechanisms encountered by Additionally, corresponding strategies improving stability are comprehensively summarized. By providing fundamental insights valuable perspectives, this contribute advancement SIBs.

Language: Английский

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Rational Regulation of High-Voltage Stability in Potassium Layered Oxide Cathodes

ACS Nano, Journal Year: 2024, Volume and Issue: 18(20), P. 13415 - 13427

Published: May 10, 2024

Layered oxide cathode materials may undergo irreversible oxygen loss and severe phase transitions during high voltage cycling be susceptible to transition metal dissolution, adversely affecting their electrochemical performance. Here, address these challenges, we propose synergistic doping of nonmetallic elements in situ diffusion as potential solution strategies. Among them, the distribution element fluorine within material can regulated by boron, thereby suppressing manganese dissolution through surface enrichment fluorine. Furthermore, from into bulk after charging reduces energy barrier potassium ion while effectively inhibiting under voltage. The modified K0.5Mn0.83Mg0.1Ti0.05B0.02F0.1O1.9 layered exhibits a capacity 147 mAh g–1 at 50 mA long cycle life 2200 cycles 500 g–1. This work demonstrates efficacy provides valuable insights for optimizing rechargeable battery materials.

Language: Английский

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Fluorine-Free Lithium Metal Batteries with a Stable LiF-Free Solid Electrolyte Interphase

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(4), P. 1389 - 1396

Published: March 5, 2024

Lithium fluoride (LiF), generated by the decomposition of in lithium metal batteries (LMBs), is considered an essential component for stabilizing metallic Li. However, substantial introduction fluorine raises potential environmental concerns. In this study, we designed a fluorine-free LMB integrating electrolyte and binder to construct B/O/N hybrid solid interphase (SEI) capable providing good stability fast Li+ transport ability. At test temperature 60 °C, LiF-free SEI can achieve highly reversible Li plating/stripping efficiency, with Coulombic efficiency 98.8% under conditions 3 mA cm–2 mAh cm–2. Furthermore, F-free battery exhibits rapid charging/discharging rate 100 C capacity exceeding 80 g–1 demonstrates stable cycling performance over 500 cycles at 50 C. The fast-charging capability was further verified practical Li–LiFePO4 full cells.

Language: Английский

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Building the Robust Fluorinated Electrode–Electrolyte Interface in Rechargeable Batteries: From Fundamentals to Applications

Electrochemical Energy Reviews, Journal Year: 2024, Volume and Issue: 7(1)

Published: June 14, 2024

Language: Английский

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Inhibiting Residual Solvent Induced Side Reactions in Vinylidene Fluoride‐Based Polymer Electrolytes Enables Ultra‐Stable Solid‐State Lithium Metal Batteries

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: May 13, 2024

Residual solvents in vinylidene fluoride (VDF)-based solid polymer electrolytes (SPEs) have been recognized as responsible for their high ionic conductivity. However, side reactions by the residual with lithium (Li) metal induce poor stability, which has long neglected. This study proposes a strategy to achieve delicate equilibrium between ion conduction and electrode stability VDF-based SPEs. Specifically, 2,2,2-trifluoro-N,N-dimethylacetamide (FDMA) is developed nonside reaction solvent poly(vinylidene fluoride-co-hexafluoropropylene) (PVHF)-based SPEs, achieving both conductivity significantly improved electrochemical stability. The FDMA fosters formation of stable electrolyte interphase (SEI) through interface Li metal, effectively mitigating dendrite growth on electrode. Consequently, Li||Li symmetric cells Li||LiFePO

Language: Английский

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Phase engineering enables ultrahigh-capacity 1T/2H-MoS2 for advanced ammonium-ion storage

Energy storage materials, Journal Year: 2025, Volume and Issue: unknown, P. 104063 - 104063

Published: Jan. 1, 2025

Language: Английский

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Precision Organocatalytic Synthesis of Fluoropolyesters with Enhanced Degradability and Ionic Conductivity

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Language: Английский

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Low-Temperature-Sensitivity Materials for Low-Temperature Lithium-Ion Batteries

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(9), P. 13232 - 13245

Published: Feb. 19, 2025

High-energy low-temperature lithium-ion batteries (LIBs) play an important role in promoting the application of renewable energy storage national defense construction, including deep-sea operations, civil and military applications, space missions. Sn-based materials show intrinsic low-temperature-sensitivity properties promising applications field subfreezing conversion. In past decade, our group has studied fundamental LIBs. this spotlight, we first discuss principles on limiting operation performance LIBs under cool environments, decreased Li-ion diffusion electrode materials, increased viscosity electrolyte, large electrochemical impedance. Then, mainly introduce strategies to improve based a series material phase transition regulation, interfacial structural engineering, targeted control electrolyte composition. Finally, further development directions several aspects extending cycle life, introducing inorganic components solid interphase (SEI), testing with pouch cells. This feature article aims provide insights into unique potential through advanced design engineering.

Language: Английский

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Construction of Fluoride‐Rich Interphase for Sustained Magnesiophilic Site Release Toward High‐Stability Chloride‐Free Magnesium Metal Batteries

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(38)

Published: July 7, 2024

Abstract Rechargeable magnesium batteries (RMBs) have the potentials in terms of high energy density, resource abundancy and safety beyond current lithium‐ion batteries. However, bare Mg metal electrode is prone to be passivated by solvents, suffering from extremely overpotential short life during cycling. Herein, a facile chloride‐free solution pretreatment method for anode developed construct fluoride‐rich artificial interphase. Driven strong‐Lewis‐acidity trifluoromethanesulfonate anion, interphase consisting magnesiophilic components are constructed substitution reaction with antimony trifluoride. The formed porous Sb‐based skeletons can uniform electric‐field distribution ions flux at side, inducing self‐adapting dendrite‐free deposition even under large density. generated alloyable fluoride enables lower desolvation barrier sustainedly release metallic compensate potentially invalid sites Therefore symmetric cells modified anodes achieve excellent cycling over 2000 h 1 mA cm −2 areal capacity 5 mAh . full CuS cathodes exhibit superior voltage stability (2.6 V vs Mg/Mg 2+ ) coulombic efficiency close 100%.

Language: Английский

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Binary Organic Solar Cells with Exceeding 19% Efficiency via the Synergy of Polyfluoride Polymer and Fluorous Solvent

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(30)

Published: May 11, 2024

Rational molecular design and suitable device engineering are two important strategies to boost the efficiencies in organic solar cells (OSCs). Yet these approaches independently developed, while their synergy is believed be more productive. Herein, a branched polyfluoride moiety, heptafluoroisopropoxyl group, introduced into side chains of conjugated polymers for first time. Compared with conventional alkyl chain, this chain can endow resulting polymer namely PF7 highly packing order strong crystallinity owing polarization fluorine-induced interactions, good solubility moderate miscibility retained. As result, comprehensively outperforms state-of-the-art PM6 photovoltaic properties. More importantly, based on groups fluorous solvents, new post-treatment denoted as solvent vapor annealing (FSVA) proposed match PF7. Differing from existing post-treatments, FSVA selectively reorganize fluoropolymer molecules but less impact small blend films. By employing solvent, achieves remarkable efficiency 19.09%, which among best binary OSCs. The treatment exhibit excellent universality various OSCs different material combinations or architectures.

Language: Английский

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