Chemical Communications, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
High-Ni cathodes promise high energy density but suffer from interfacial degradation. Here, a dual-additive electrolyte-trimethylsilyl phosphate to scavenge HF and adiponitrile tailor Li+ solvation-enables robust, LiF-rich CEI, boosting NCM811's stability. This strategy achieves 90.16% capacity retention at 5C, offering pathway durable, high-performance batteries.
Язык: Английский
Science China Chemistry, Год журнала: 2025, Номер unknown
Опубликована: Апрель 21, 2025
Язык: Английский
Процитировано
0
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 29, 2025
Abstract Anode‐free lithium metal battery (AFLMB) has become an excellent candidate for long endurance electric vehicles and low altitude aircraft, profiting from its high energy density as well outstanding manufacturing safety. However, the limitation at discharge rates of AFLMBs is shrouded in mystery, yet to achieve more attention. Herein, fast dissected exhaustively, a symptomatic strategy break limit put forward, order eliminate inevitable mismatch that lies inferior performance AFLMBs. A “volcano‐type” curve capacity retention discovered with rate increased. Systematic investigation revealed overlapped spatial relationship between fresh deposited Li residue 0 facilitated utilization “recoverable ” (Li ) prophase increase. further enhanced induced large concentration polarization ( η conc ), reflecting limited + diffusion. Enabling electrolyte rapidly transport by lowering increased optimal cycling stability This work reveals rate‐determining step high‐rate expands employment boundary under harsh conditions, providing significant complement present knowledge respect power
Язык: Английский
Процитировано
0
Journal of the American Chemical Society, Год журнала: 2025, Номер unknown
Опубликована: Май 2, 2025
Sulfone-based electrolytes offer unusually high anodic and thermal stability that in principle makes them promising candidates for fabricating energy-dense lithium metal batteries (LMBs). Their uses practical are currently limited by their inability to sustain long-term Li plating/stripping processes due reactivity toward the metal. Here, we report on design synthesis of a unique family fluorosulfonyl group-based (FSO2-) molecules, modified with ethyl (FSE)/N,N-dimethyl (FSNDM)/N,N-diethyl (FSNDE)/N-pyrrolidine (FSNP) end groups create exceptionally stable single-salt single-solvent electrolytes. The flammability, solvation structure, ion transport, deposition kinetics, high-voltage systematically studied. It is shown nonflammable, possess weak characteristics, yet manifest room-temperature ionic conductivities (1.6-6.1 mS cm-1) low solution viscosities. In comparison FSE, FSNDM-, FSNDE-, FSNP-based exhibit an reversible Coulombic efficiency (>99.71% over 800 cycles) typical oxidative at voltages exceeding 4.6 V. Deployed as (20 μm anode 3 g A h-1 electrolyte) high-loading (18.5 mg cm-2) LiNi0.8Co0.1Mn0.1O2 cathodes, 329 cycles have been achieved before 80% capacity retention. Six Ah pouch cells based designed also energy density (496 W h kg-1) 150 most 2.7% volume expansion. Our findings demonstrate through intentional molecular design, sulfone provide robust route nonflammable compatible cathodes.
Язык: Английский
Процитировано
0
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Май 22, 2025
Abstract Sulfurized polyacrylonitrile (SPAN) recently emerges as a prospective cathode for lithium–sulfur (Li–S) batteries owing to its high S utilization, remarkable cycling stability, and liberty from shuttle effect. Despite weakly solvating ether electrolytes exhibiting simultaneously compatibility SPAN lithium (Li) anode, they universally suffer low ionic conductivity narrow liquid‐phase temperature range. However, conventional ether‐based with excellent cannot realize reversible solid–solid conversion of due Li polysulfide intermediates (LiPSs) dissolving shuttling. Here, series ethers are evaluated by selectively methylating dimethoxymethane (DMM) fine‐tune their solvation capability Enlightened electrolytes, the contact ion pair (CIP)‐dominated electrolyte is designed satisfactory over wide The reinforcement mechanisms CIP‐dominated anode comprehensively elucidated through experimental characterizations molecular dynamics simulations. Based on optimized electrolyte, Li||SPAN full cells can steadily operate range −20 60 °C. Furthermore, 120 mAh pouch cell exhibit 85.5% capacity retention after 45 cycles at 0.2 C.
Язык: Английский
Процитировано
0
Chemical Communications, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
High-Ni cathodes promise high energy density but suffer from interfacial degradation. Here, a dual-additive electrolyte-trimethylsilyl phosphate to scavenge HF and adiponitrile tailor Li+ solvation-enables robust, LiF-rich CEI, boosting NCM811's stability. This strategy achieves 90.16% capacity retention at 5C, offering pathway durable, high-performance batteries.
Язык: Английский
Процитировано
0