Regulating Steric Hindrance of Porous Organic Polymers in Composite Solid‐State Electrolytes to Induce the Formation of LiF‐Rich SEI in Li‐Ion Batteries

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(39)

Published: Aug. 2, 2023

Lithium fluoride (LiF) at the solid electrolyte interface (SEI) contributes to stable operation of polymer-based solid-state lithium metal batteries. Currently, most methods for constructing SEI are based on design polar groups fillers. However, mechanism behind how steric hindrance fillers impacts LiF formation remains unclear. This study synthesizes three kinds porous polyacetal amides (PAN-X, X=NH2 , NH-CH3 N-(CH3 )2 ) with varying hindrances by regulating number methyl substitutions nitrogen atoms reaction monomer, which incorporated into polymer composite electrolytes, investigate regulation content in SEI. The results show that bis(trifluoromethanesulfonyl)imide (TFSI- will compete charge without effect, while excessive hinders interaction between TFSI- and groups, reducing acquisition. Only when one hydrogen atom amino group is replaced a group, from prevents capturing direction, thereby facilitating transfer separate promoting maximum formation. work provides novel perspective LiF-rich

Language: Английский

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A review of the degradation mechanisms of NCM cathodes and corresponding mitigation strategies

Journal of Energy Storage, Journal Year: 2023, Volume and Issue: 73, P. 108875 - 108875

Published: Sept. 7, 2023

Language: Английский

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Recent Advances in Structural Optimization and Surface Modification on Current Collectors for High-Performance Zinc Anode: Principles, Strategies, and Challenges

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Aug. 31, 2023

The last several years have witnessed the prosperous development of zinc-ion batteries (ZIBs), which are considered as a promising competitor energy storage systems thanks to their low cost and high safety. However, reversibility availability this system blighted by problems such uncontrollable dendritic growth, hydrogen evolution, corrosion passivation on anode side. A functionally structurally well-designed current collectors (CCs) is believed viable solution for those problems, with lack summarization according its working mechanisms. Herein, review focuses challenges zinc mechanisms modified CCs, can be divided into zincophilic modification, structural design, steering preferred crystal facet orientation. possible prospects directions research design proposed at end hopefully promote practical application ZIBs.

Language: Английский

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The Versatile Establishment of Charge Storage in Polymer Solid Electrolyte with Enhanced Charge Transfer for LiF‐Rich SEI Generation in Lithium Metal Batteries

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(18)

Published: March 2, 2024

Abstract The solid‐state electrolyte interface (SEI) between the polymer and lithium metal anode dramatically affects overall battery performance. Increasing content of fluoride (LiF) in SEI can help uniform deposition inhibit growth dendrites, thus improving cycle stability performance batteries. Currently, most methods constructing LiF involve decomposing salt by polar groups filler. However, there is a lack research reports on how to affect layer Li‐ion batteries increasing charge transfer number. In this study, porous organic with “charge storage” properties was prepared doped into composite solid study effect sufficient decomposition salts. results show contrast porphyrins, unique structure POF allows for each individual porphyrin. Therefore, during TFSI − formation LiF, obtain charge, thereby promoting break C−F forming LiF‐rich SEI. Compared single porphyrin (0.423 e ), provides 2.7 times more LiTFSI (1.147 ). experimental that Li//Li symmetric equipped PEO‐POF be operated stably than 2700 h at 60 °C. Even (45 μm) cells are stable 1100 0.1 mA cm −1 . addition, LiFePO 4 //PEO‐POF//Li have excellent cycling 2 C (80 % capacity retention after 750 cycles). 1 (96 300 when PEO‐base replaced PEG‐base PVDF‐base, cell still significantly improved. we believe concept offers novel perspective preparation high‐performance assemblies.

Language: Английский

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A Lithiophilic–Lithiophobic Gradient Solid Electrolyte Interface Toward a Highly Stable Solid‐State Polymer Lithium Metal Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(27)

Published: March 7, 2024

Abstract The functional lithiophilic−lithiophobic gradient solid electrolyte interphase (SEI) between Li‐metal anode and solid‐state polymer electrolytes may be effective in addressing the long‐standing issue of side reactions Li‐dendrite growth during repeated deposition or dissolution polymer‐based high‐energy‐density batteries. Herein, a reliable lithiophilic–lithiophobic SEI (G‐SEI) LiAg‐LiF/Li 3 N is situ formed by AgTFSI, used as an additive for polyethylene oxide‐based (PEO‐Ag). upper layer consists lithiophobic LiF/Li N‐rich layer, wherein LiF possesses high interfacial energy, while Li enables fast + diffusion, which synergistically facilitates uniform . Lithiophilic Li–Ag alloy can effectively reduce nucleation overpotential promote more planar lithium. Furthermore, such G‐SEI mechanical modulus, mitigating penetration dendrites through thereby preventing continuous degradation PEO‐based electrolyte. As result, over three times improvement lifespan | PEO‐Ag LFP cell achieved, demonstrating 81.4% capacity retention rate after 500 cycles at 1C, compared to PEO with common SEI. Thus, developments lithiophilic‐lithiophobic provide substantial path toward high‐performance lithium

Language: Английский

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Artificial LiF‐Rich Interface Enabled by In situ Electrochemical Fluorination for Stable Lithium‐Metal Batteries

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(12)

Published: Jan. 30, 2024

Lithium (Li)-metal batteries are promising next-generation energy storage systems. One drawback of uncontrollable electrolyte degradation is the ability to form a fragile and nonuniform solid interface (SEI). In this study, we propose use fluorinated carbon nanotube (CNT) macrofilm (CMF) on Li metal as hybrid anode, which can regulate redox state at anode/electrolyte interface. Due favorable reaction between plated CNTs, be directly LiF-rich SEI during charging process, leading high Young's modulus (~2.0 GPa) fast ionic transfer (~2.59×10

Language: Английский

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The Versatile Establishment of Charge Storage in Polymer Solid Electrolyte with Enhanced Charge Transfer for LiF‐Rich SEI Generation in Lithium Metal Batteries

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(18)

Published: March 2, 2024

Abstract The solid‐state electrolyte interface (SEI) between the polymer and lithium metal anode dramatically affects overall battery performance. Increasing content of fluoride (LiF) in SEI can help uniform deposition inhibit growth dendrites, thus improving cycle stability performance batteries. Currently, most methods constructing LiF involve decomposing salt by polar groups filler. However, there is a lack research reports on how to affect layer Li‐ion batteries increasing charge transfer number. In this study, porous organic with “charge storage” properties was prepared doped into composite solid study effect sufficient decomposition salts. results show contrast porphyrins, unique structure POF allows for each individual porphyrin. Therefore, during TFSI − formation LiF, obtain charge, thereby promoting break C−F forming LiF‐rich SEI. Compared single porphyrin (0.423 e ), provides 2.7 times more LiTFSI (1.147 ). experimental that Li//Li symmetric equipped PEO‐POF be operated stably than 2700 h at 60 °C. Even (45 μm) cells are stable 1100 0.1 mA cm −1 . addition, LiFePO 4 //PEO‐POF//Li have excellent cycling 2 C (80 % capacity retention after 750 cycles). 1 (96 300 when PEO‐base replaced PEG‐base PVDF‐base, cell still significantly improved. we believe concept offers novel perspective preparation high‐performance assemblies.

Language: Английский

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Development of Polymer-based Artificial Solid Electrolyte Interphase for Safer Li-Metal Batteries: Challenges, Strategies and Prospects

Nano Energy, Journal Year: 2024, Volume and Issue: 129, P. 109970 - 109970

Published: July 8, 2024

Language: Английский

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Designing Current Collectors to Stabilize Li Metal Anodes

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 5, 2025

Rechargeable batteries employing Li metal anodes have gained increasing attention due to their high energy density. Nevertheless, low stability and reversibility of severely impeded practical applications. Designing current collectors (CCs) with reasonable structure composition is an efficient approach stabilizing the anodes. However, in-depth comprehensive understanding about design principles modification strategies CCs for realizing stable still lacking. Herein, a critical review focusing on rational summarized. First, requirements in are elucidated clarify objectives CCs. Then, including lithiophilic site modification, 3D architecture construction, protective layer crystalline plane engineering, as well corresponding highlighted. On this basis, recent progress development discussed. Finally, future directions suggested focus developing operando monitoring technology, designing cells under conditions close commercial This will spur more insightful researches toward advanced CCs, promote commercialization.

Language: Английский

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Revisiting Dipole-Induced Fluorinated-Anion Decomposition Reaction for Promoting a LiF-Rich Interphase in Lithium-Metal Batteries

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Jan. 20, 2025

Abstract Building anion-derived solid electrolyte interphase (SEI) with enriched LiF is considered the most promising strategy to address inferior safety features and poor cyclability of lithium-metal batteries (LMBs). Herein, we discover that, instead direct electron transfer from surface polar groups bis(trifluoromethanesulfonyl)imide (TFSI − ) for inducing a LiF-rich SEI, dipole-induced fluorinated-anion decomposition reaction begins adsorption Li ions highly dependent on their mobility surface. To demonstrate this, single-layer graphdiyne MXene (sGDY@MXene) heterostructure has been successfully fabricated integrated into polypropylene separators. It found that adsorbed connect electron-donating sGDY@MXene TFSI , facilitating interfacial charge decomposition. However, this does not capture entire picture. The also renders high mobility, enabling them reach optimal sites expedite coordination processes O O=S=O F broken –CF 3 bond cleavage. In contrast, immobilized more lithiophilic pristine retard these cleavage processes. Consequently, accelerated sGDY@MXene. This work highlights dedicate balance between lithiophilicity Li-ion in effectively promoting SEI long-term stability LMBs.

Language: Английский

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